16986( 10) - 27-Nov-2023 16:18:27 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16986 Version: 10 Check-in Time: 27-Nov-2023 16:18:27 STScI Edit Number: 4 Title Accreting white dwarfs as probes of compact binary evolution ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Anna Francesca Pala ESA-European Space Astronomy Centre Y CoI: Dr. Thomas Kupfer Texas Tech University Y CoI: Prof. Scott F. Anderson University of Washington N CoI: Dr. Elme Breedt University of Cambridge N CoI: Dr. Domitilla De Martino Osservatorio Astronomico di Capodimonte N (OAC) CoI: Dr. Alessandro Ederoclite Centro de Estudios de Fisica del Cosmos de N Aragon CoI: Dr. Patrick Godon Villanova University N CoI: Mr. Matthew Green The University of Warwick N CoI: Prof. Paul J. Groot Radboud Universiteit Nijmegen N CoI: Prof. Daryl Haggard McGill University N CoI: Dr. Stella Kafka American Association Of Variable Star N Observers CoI: Prof. Christian Knigge University of Southampton N CoI: Prof. Tom R. Marsh The University of Warwick N CoI: Dr. Elena Mason INAF, Osservatorio Astronomico di Trieste N CoI: Prof. Gijs Nelemans Radboud Universiteit Nijmegen N CoI: Prof. Rosa Poggiani Universita di Pisa N CoI: Dr. Gavin Ramsay Armagh Observatory and Planetarium N CoI: Dr. Pablo Rodriguez-Gil Instituto de Astrofisica de Canarias N CoI: Dr. Linda Schmidtobreick European Southern Observatory - Chile N CoI: Prof. Matthias R. Schreiber Universidad Tecnica Federico Santa Maria N CoI: Prof. Edward M. Sion Villanova University N CoI: Prof. Danny Steeghs The University of Warwick N CoI: Prof. Paula Szkody University of Washington N CoI: Dr. Odette Fabiola Toloza Universidad Tecnica Federico Santa Maria N Castillo CoI: Dr. Gagik Tovmasian Universidad Nacional Autonoma de Mexico N (UNAM) CoI: Dr. Dean Townsley University of Alabama N CoI: Dr. Patrick Woudt University of Cape Town N CoI: Dr. Jan van Roestel California Institute of Technology N CoI: Prof. Boris T. Gaensicke The University of Warwick N CoI: Dr. Knox S. Long Eureka Scientific Inc. N ------------------------------------------------------------------------------------ Abstract In the last 20 years, the study of compact interacting binaries has led to two major breakthroughs in astrophysics: the discovery of dark energy and the first detection of gravitational waves. Although binaries are critically important to probe the properties of the Universe and to test fundamental physical theories, our understanding of their evolution and final fate is still far from being complete. 16986( 10) - 27-Nov-2023 16:18:27 - [ 2] Accreting white dwarfs are ideal laboratories in which to test the models of compact binary evolution. We here propose a COS Treasury program specifically designed to explore those regions of the parameter space that have been previously poorly studied and where major discrepancies between the theory and observations are found. Combining the high-quality ultraviolet data with the parallaxes from Gaia, we will accurately measure effective temperatures, masses and accretion rates for 43 accreting white dwarfs (the minimum number required to homogeneously sample the entire physical parameter space spanned by this diverse population) thereby testing the mechanisms of angular momentum loss which drive the evolution of all kinds of binaries. The white dwarf masses are a key ingredient in the pathway toward Supernova Type Ia explosions and by obtaining their accurate values, we will constrain both the single and the double-detonation scenarios. Finally, only the ultraviolet allows the detection of the nitrogen and carbon resonance lines. From their abundances, we will establish the formation channel for the most compact systems, which will later be used to verify the performance of the space-mission LISA and calibrate the detector for future gravitational wave source discoveries. ------------------------------------------------------------------------------------ Observations Description ------------------------ The aim of this program is to obtain far-ultraviolet COS/G140L and STIS/E140M spectroscopy of 43 accreting white dwarfs (WDs). While past HST observations have studied in detail systems in the range 70 min < Porb < 150 min, very few observations have been obtained of long- (Porb > 150 min) and short- (Porb < 60 min) period accreting WDs, which are therefore the targets of this proposal. We have screened the literature for systems that are bright enough to be observed in 3-5 HST orbits each. The set of targets was chosen to ensure a homogeneous sampling across the Porb range and to maximise the chances of detecting the white dwarf in the UV, and avoiding frequently outbursting systems. The actual observations are relatively straight-forward: target acquisition, depending on the target brightness, will be done with NUV imaging, or in dispersed light using the G140L grating. The coordinates and proper motions are drawn from Gaia EDR3, hence we do not precede the observations with a search pattern. Depending on the target brightness, the COS G140L spectroscopy will extend over 2, 3, 4, 5 or 6 orbits. We will make use of all 4 FP-POS positions. Our targets can be divided in two sub-classes according to their observational properties: 1) Dwarf novae: systems characterised by quiescent states of low-mass transfer rates onto the WD, interrupted by bright disc outbursts, during which the binary typically brightens by 2-5 magnitudes. In order to ensure that HST spectroscopy is obtained during quiescence, when the WD is the dominant emission source and safe to be observed, we will obtain intensive continuous ground-based monitoring up until 24 h prior to the HST observations. 2) Nova-likes: systems in the period range 180 min < Porb < 240 min are typically characterised by high average accretion rates which keep the disc in a stable hot state, equivalent to a permanent outburst. Occasionally the accretion rate drastically drops ("low state"), unveiling the WD. Our sample contains nine systems falling in this category. We will photometrically monitor them from the ground and the HST observations will be triggered via a non-disruptive ToO only once a low state is detected. We expect to detect ~3 systems in low state per year and the observations of these targets will be 16986( 10) - 27-Nov-2023 16:18:27 - [ 3] carried out over the over the next three cycles, in order to observe nine of these systems by the end of the program. Several of the targets are eclipsing (GS Pav, V1239 Her, 2MASS J15445360+2553488, YZ LMi, ZTFJ040749.30-000716.67, ASASSN-14cn, ZTF-J2252-0519). We have included their ephemeris in order for the target acquisition to be scheduled such that it avoids the eclipse (in a similar strategy as that of HST program 12870). Impact of reduced-gyro operations: For the dwarf nova targets, we do not expect major impacts on our program in case of reduced-gyro operations. Prolonged acquisition procedures will not significantly affect the SNR we can achieve, while a possible extension of our program into the next cycle will not preclude our science goals, nor affect in any way the feasibility of our observations. Instead, with time critical observations becoming much more difficult to schedule, reduced-gyro operations could potentially affect the observations of the nova-like targets, for which long-term non-disruptive ToOs are necessary. The additional nova-likes targets we have include can possibility mitigate the limitations related to reduced-gyro operations by offering (i) alternative pointings that can compensate for the limited sky accessibility, (ii) alternative observing windows that could be more easily included in the schedule. ------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J23375 STAR, INTERACTING RA=23H37M59.2215S +/- J2000 V = 14.31 +/- 0.08 NUV = 17.49, Gaia 921+4308509 BINARY, IRREGULAR 3.3565037E-5", DEC=+43D08'50.89" EDR3 1925596502097065344, G=16.2, VARIABLE, NOVA-LIKE +/- 2.5454878E-5" parallax = 1.17(4) mas. Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016.0 4.623053125836002E-4 -0.008709179843108804 0.0011740599949903849 ------------------------------------------------------------------------------------------------------------------------------------ 2 1RXS-J022917 STAR, INTERACTING RA=02H29M17.0025S +/- J2000 V = 13.52 +/- 0.05 FUV = 13.4, Gaia .1-395851 BINARY, IRREGULAR 8.7900935E-6", DEC=-39D59'1.61" EDR3 4951395327129718528, G=13.5, VARIABLE, NOVA-LIKE +/- 1.0651098E-5" parallax = 2.04(1) mas. Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016.0 0.003707698321417459 0.0027212311407274633 0.0020367016033755827 ------------------------------------------------------------------------------------------------------------------------------------ 4 GD-1662 STAR, INTERACTING RA=23H29M0.4543S +/- J2000 V = 13.2 +/- 0.3 FUV=14.0, NUV=13.8, BINARY, IRREGULAR 1.3830418E-5", DEC=-29D46'46.08" Gaia EDR3 2329317895999827840, G=13.6, VARIABLE, NOVA-LIKE +/- 1.6832153E-5" parallax = 1.64(2) mas. Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016.0 -0.0010636585725361367 -0.006005677448492444 0.001640177333531042 ------------------------------------------------------------------------------------------------------------------------------------ 11 GD-1662-SAFE UNIDENTIFIED, BLANK RA-OFF=.54S, DEC-OFF=6.6", FROM J2000 V = 13.2 +/- 0.3 -TARGET FIELD 4 Extended: NO Comments: This target is a blank piece of sky whihc is the bright object safe pointing and is 9.723" away at PA 47.2 degrees from GD-1662 ------------------------------------------------------------------------------------------------------------------------------------ 6 HS-0506+7725 STAR, INTERACTING RA=05H13M36.5757S +/- J2000 V = 14.7 FUV=16.5, NUV=16.5, Gaia EDR3 BINARY, IRREGULAR 1.5777166E-5", DEC=+77D28'42.67" 552158697769217664, G=15.04, parallax = VARIABLE, NOVA-LIKE +/- 1.814929E-5" 1.09(2) mas. Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016.0 3.9425604625055726E-4 -0.006849241478209648 0.001085954010123805 ------------------------------------------------------------------------------------------------------------------------------------ 7 V-KR-AUR STAR, INTERACTING RA=06H15M43.9255S +/- J2000 V = 13.090 Gaia EDR3 BINARY, IRREGULAR 2.0653458E-4", DEC=+28D35'8.42" 3436435910858051200, G=18.6, parallax = VARIABLE, NOVA-LIKE +/- 1.7373438E-4" 2.2(2) mas. Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016.0 4.091904507683111E-4 -0.008128654994250011 0.0022451401705564614 ------------------------------------------------------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 5] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 10 V-KR-AUR-SAF UNIDENTIFIED, BLANK RA-OFF=-0.58S, DEC-OFF=-5.844", J2000 V = 13.090 E-TGT FIELD FROM 7 Extended: NO Comments: This target is a blank piece of sky which is the Safe target offset position for science visit 07. It is 9.706" away at PA 233.0 degrees from V-KR-AUR ------------------------------------------------------------------------------------------------------------------------------------ 8 V-V794-AQL STAR, INTERACTING RA=20H17M33.8730S +/- J2000 V = 14.7 FUV = 16.2, Gaia EDR3 BINARY, IRREGULAR 2.2348106E-5", DEC=-03D39'51.19" 4222299752184927616, G=14.8, parallax = VARIABLE, NOVA-LIKE +/- 1.722222E-5" 1.53(3) mas. Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016.0 -0.0026811010615835993 -0.014632375673806652 0.0015277963634299084 ------------------------------------------------------------------------------------------------------------------------------------ 9 V-V442-OPH STAR, INTERACTING RA=17H32M15.1318S +/- J2000 V = 13.4 FUV=16.7, NUV=16.5, G=13.9, BINARY, IRREGULAR 1.554054E-5", DEC=-16D15'22.01" Gaia EDR3 4124654392314770048, VARIABLE, NOVA-LIKE +/- 1.1368409E-5" G=parallax=2.07(1) mas. Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016.0 -2.7509883257076606E-4 0.0035013410220099414 0.002070837745656075 ------------------------------------------------------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 6] Visit: 01 (2MASS-J23375921+4308509) Visit Requirements: SCHED 100%; BETWEEN 15-JUN-2021:00:00:00 AND 15-JAN-2022:00:00:00; BETWEEN 15-JUN-2022:00:00:00 AND 15-JAN-2023:00:00:00; BETWEEN 15-JUN-2023:00:00:00 AND 15-JAN-2024:00:00:00; BETWEEN 15-JUN-2024:00:00:00 AND 15-JAN-2025:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: LONG-TERM TOO This is one of the targets in which the white dwarf is visible only during a low state. We will trigger the ToO when the occurrence of a low state is detected by our ground-based monitoring. Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J2337 COS/FUV ACQ/PEA PSA G140L 1105 1 17 S (17 5921+430850 KXD S) 9 Comments: I ran a WD spectrum with Teff=50000K, scaled to the distance to the system, through the ETC. The exposure time allows for the system fading 2 more magnitudes. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J2337 COS/FUV ACQ/PEA PSA G140L 1105 CENTER=FLUX-WT-FLR, NUM-POS=5, 1 17 S (17 5921+430850 KD STEP-SIZE=0.9 S) 9 Comments: I ran a WD spectrum with Teff=50000K, scaled to the distance to the system, through the ETC. The exposure time allows for the system fading 2 more magnitudes. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J2337 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=1, 1 872 S (872 5921+430850 G BUFFER-TIME=872 S) 9 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASS-J2337 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=2, 1 872 S (872 5921+430850 G BUFFER-TIME=872 S) 9 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 5 2MASS-J2337 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=3, 1 1146 S 5921+430850 G BUFFER-TIME=1146 (1146 S) 9 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 6 2MASS-J2337 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=4, 1 1146 S 5921+430850 G BUFFER-TIME=1146 (1146 S) 9 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J23375921+430 1 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A 8509 KXD 2MASS-J23375921+430 2 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A 8509 KD 2MASS-J23375921+430 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 8509 G 2MASS-J23375921+430 4 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 8509 G 2MASS-J23375921+430 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 8509 G 2MASS-J23375921+430 6 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 8509 G 16986( 10) - 27-Nov-2023 16:18:27 - [ 8] Visit: 02 (1RXS-J022917.1-395851) Visit Requirements: SCHED 100%; BETWEEN 30-JUN-2021:00:00:00 AND 22-FEB-2022:00:00:00; BETWEEN 30-JUN-2022:00:00:00 AND 22-FEB-2023:00:00:00; BETWEEN 30-JUN-2023:00:00:00 AND 22-FEB-2024:00:00:00; BETWEEN 30-JUN-2024:00:00:00 AND 22-FEB-2025:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: LONG-TERM TOO This is one of the targets in which the white dwarf is visible only during a low state. We will trigger the ToO when the occurrence of a low state is detected by our ground-based monitoring. Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 1RXS-J02291 COS/FUV ACQ/PEA PSA G140L 1105 1 25 S (25 7.1-395851 KXD S) Comments: I ran a WD spectrum with Teff=50000K, scaled to the distance to the system, through the ETC. The exposure time allows for the system fading 2 more magnitudes. ------------------------------------------------------------------------------------------------------------------------------------ 2 1RXS-J02291 COS/FUV ACQ/PEA PSA G140L 1105 CENTER=FLUX-WT-FLR, NUM-POS=5, 1 25 S (25 7.1-395851 KD STEP-SIZE=0.9 S) Comments: I ran a WD spectrum with Teff=50000K, scaled to the distance to the system, through the ETC. The exposure time allows for the system fading 2 more magnitudes. ------------------------------------------------------------------------------------------------------------------------------------ 3 1RXS-J02291 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=1, 1 839 S (839 7.1-395851 G BUFFER-TIME=839 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 4 1RXS-J02291 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=2, 1 839 S (839 7.1-395851 G BUFFER-TIME=839 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 5 1RXS-J02291 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=3, 1 1145 S 7.1-395851 G BUFFER-TIME=1145 (1145 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 9] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 6 1RXS-J02291 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=4, 1 1145 S 7.1-395851 G BUFFER-TIME=1145 (1145 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 1RXS-J022917.1-3958 1 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A 51 KXD 1RXS-J022917.1-3958 2 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A 51 KD 1RXS-J022917.1-3958 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 51 G 1RXS-J022917.1-3958 4 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 51 G 1RXS-J022917.1-3958 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 51 G 1RXS-J022917.1-3958 6 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 51 G 16986( 10) - 27-Nov-2023 16:18:27 - [ 10] Visit: 04 (GD-1662) Visit Requirements: SCHED 100%; ORIENT 280D TO 85 D; BETWEEN 23-OCT-2023:00:00:00 AND 25-NOV-2023:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: LONG-TERM TOO This is one of the targets in which the white dwarf is visible only during a low state. We will trigger the ToO when the occurrence of a low state is detected by our ground-based monitoring. Additional Comments: This should be scheduled in evening local-time on a thursday or friday. Flags need to be cleared during the work day. Weekends & holidays are to be avoided since the CS must clear the target within 24 hours of HST execution Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GD-1662 COS/FUV ACQ/PEA PSA G140L 1105 LIFETIME-POS=LP4 1 27 S (27 USE OFFSET V04SAF KXD S) Comments: I ran a WD spectrum with Teff=50000K, scaled to FUV=16.6 (as measured from IUE data obtained in low state), through the ETC. The exposure time allows for the system fading another magnitude. ------------------------------------------------------------------------------------------------------------------------------------ 2 GD-1662 COS/FUV ACQ/PEA PSA G140L 1105 CENTER=FLUX-WT-FLR, NUM-POS=5, 1 27 S (27 USE OFFSET V04SAF KD STEP-SIZE=0.9, S) LIFETIME-POS=LP4 Comments: I ran a WD spectrum with Teff=50000K, scaled to FUV=16.6 (as measured from IUE data obtained in low state), through the ETC. The exposure time allows for the system fading another magnitude. ------------------------------------------------------------------------------------------------------------------------------------ 3 GD-1662 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=1, 1 832 S (832 USE OFFSET V04SAF G BUFFER-TIME=361, S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ 4 GD-1662 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=2, 1 820 S (820 USE OFFSET V04SAF G BUFFER-TIME=361, S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 11] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 5 GD-1662 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=3, 1 1146 S USE OFFSET V04SAF G BUFFER-TIME=518, (1146 S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ 6 GD-1662 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=4, 1 1193 S USE OFFSET V04SAF G BUFFER-TIME=541, (1193 S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ GD-1662 1 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KXD GD-1662 2 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KD GD-1662 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G GD-1662 4 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G GD-1662 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G GD-1662 6 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G 16986( 10) - 27-Nov-2023 16:18:27 - [ 12] Visit: 06 (HS-0506+7725) Visit Requirements: SCHED 100%; BETWEEN 01-SEP-2021:00:00:00 AND 05-APR-2022:00:00:00; BETWEEN 01-SEP-2022:00:00:00 AND 05-APR-2023:00:00:00; BETWEEN 01-SEP-2023:00:00:00 AND 05-APR-2024:00:00:00; BETWEEN 01-SEP-2024:00:00:00 AND 05-APR-2025:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: LONG-TERM TOO This is one of the targets in which the white dwarf is visible only during a low state. We will trigger the ToO when the occurrence of a low state is detected by our ground-based monitoring. Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HS-0506+772 COS/FUV ACQ/PEA PSA G140L 1105 1 40 S (40 5 KXD S) Comments: Exposure time based on a 50000K WD model, scaled to the distance to the system, but conservatively allowing for the target fading two more magnitudes. ------------------------------------------------------------------------------------------------------------------------------------ 2 HS-0506+772 COS/FUV ACQ/PEA PSA G140L 1105 CENTER=FLUX-WT-FLR, NUM-POS=5, 1 40 S (40 5 KD STEP-SIZE=0.9 S) Comments: Exposure time based on a 50000K WD model, scaled to the distance to the system, but conservatively allowing for the target fading two more magnitudes. ------------------------------------------------------------------------------------------------------------------------------------ 3 HS-0506+772 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=1, 1 1820 S 5 G BUFFER-TIME=752 (1820 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 4 HS-0506+772 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=2, 1 1185 S 5 G BUFFER-TIME=1185 (1185 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 5 HS-0506+772 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=3, 1 1186 S 5 G BUFFER-TIME=1186 (1186 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 13] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 6 HS-0506+772 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=4, 1 2552 S 5 G BUFFER-TIME=2552 (2552 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HS-0506+7725 1 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KXD HS-0506+7725 2 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KD HS-0506+7725 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G HS-0506+7725 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G HS-0506+7725 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G HS-0506+7725 6 COS/FUV TIME-TA PSA G140L 800 none none none none 3 N/A G 16986( 10) - 27-Nov-2023 16:18:27 - [ 14] Visit: 07 (V-KR-AUR) Visit Requirements: SCHED 100%; ORIENT 75D TO 290 D; BETWEEN 18-SEP-2021:00:00:00 AND 22-APR-2022:00:00:00; BETWEEN 18-SEP-2022:00:00:00 AND 22-APR-2023:00:00:00; BETWEEN 18-SEP-2023:00:00:00 AND 22-APR-2024:00:00:00; BETWEEN 18-SEP-2024:00:00:00 AND 22-APR-2025:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: LONG-TERM TOO This is one of the targets in which the white dwarf is visible only during a low state. We will trigger the ToO when the occurrence of a low state is detected by our ground-based monitoring. Additional Comments: This should be scheduled on a Thursday/Friday evening local time. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 V-KR-AUR COS/NUV ACQ/IMA PSA MIRRORB 1 35 S (35 USE OFFSET V07SAF GE S) Comments: Computed assuming a WD model with Teff=30000K, scaled to NUV=18 (allowing the target to be fainter by one magnitude compared to previous low state observations obtained with Swift). ------------------------------------------------------------------------------------------------------------------------------------ 2 V-KR-AUR COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=1, 1 967 S (967 USE OFFSET V07SAF G BUFFER-TIME=967, S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 3 V-KR-AUR COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=2, 1 967 S (967 USE OFFSET V07SAF G BUFFER-TIME=967, S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 4 V-KR-AUR COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=3, 1 1146 S USE OFFSET V07SAF G BUFFER-TIME=1146, (1146 S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 15] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 5 V-KR-AUR COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=4, 1 1145 S USE OFFSET V07SAF G BUFFER-TIME=1145, (1145 S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ V-KR-AUR 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE V-KR-AUR 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G V-KR-AUR 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G V-KR-AUR 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G V-KR-AUR 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G 16986( 10) - 27-Nov-2023 16:18:27 - [ 16] Visit: 08 (V-V794-AQL) Visit Requirements: SCHED 100%; BETWEEN 18-APR-2021:00:00:00 AND 08-NOV-2021:00:00:00; BETWEEN 18-APR-2022:00:00:00 AND 08-NOV-2022:00:00:00; BETWEEN 18-APR-2023:00:00:00 AND 08-NOV-2023:00:00:00; BETWEEN 18-APR-2024:00:00:00 AND 08-NOV-2024:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: LONG-TERM TOO This is one of the targets in which the white dwarf is visible only during a low state. We will trigger the ToO when the occurrence of a low state is detected by our ground-based monitoring. Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 V-V794-AQL COS/FUV ACQ/PEA PSA G140L 1105 1 47 S (47 KXD S) Comments: I ran a WD spectrum with Teff=50000K, scaled to the distance to the system, through the ETC. The exposure time allows for the system fading 1 more magnitudes. ------------------------------------------------------------------------------------------------------------------------------------ 2 V-V794-AQL COS/FUV ACQ/PEA PSA G140L 1105 CENTER=FLUX-WT-FLR, NUM-POS=5, 1 47 S (47 KD STEP-SIZE=0.9 S) Comments: I ran a WD spectrum with Teff=50000K, scaled to the distance to the system, through the ETC. The exposure time allows for the system fading 1 more magnitudes. ------------------------------------------------------------------------------------------------------------------------------------ 3 V-V794-AQL COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=1, 1 1674 S G BUFFER-TIME=1527 (1674 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 4 V-V794-AQL COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=2, 1 1141 S G BUFFER-TIME=1141 (1141 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 5 V-V794-AQL COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=3, 1 1140 S G BUFFER-TIME=1140 (1140 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 17] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 6 V-V794-AQL COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=4, 1 2462 S G BUFFER-TIME=1527 (2462 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ V-V794-AQL 1 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KXD V-V794-AQL 2 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KD V-V794-AQL 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G V-V794-AQL 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G V-V794-AQL 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G V-V794-AQL 6 COS/FUV TIME-TA PSA G140L 800 none none none none 3 N/A G 16986( 10) - 27-Nov-2023 16:18:27 - [ 18] Visit: 09 (V-V442-OPH) Visit Requirements: SCHED 100%; BETWEEN 07-MAR-2022:00:00:00 AND 10-OCT-2022:00:00:00; BETWEEN 07-MAR-2023:00:00:00 AND 10-OCT-2023:00:00:00; BETWEEN 07-MAR-2024:00:00:00 AND 10-OCT-2024:00:00:00; BETWEEN 07-MAR-2025:00:00:00 AND 10-OCT-2025:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: LONG-TERM TOO This is one of the targets in which the white dwarf is visible only during a low state. We will trigger the ToO when the occurrence of a low state is detected by our ground-based monitoring. Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 V-V442-OPH COS/FUV ACQ/PEA PSA G140L 1105 1 32 S (32 KXD S) Comments: I ran a WD spectrum with Teff=50000K, scaled to FUV=16.8 (as measured from Galex photometry in low state), through the ETC. The exposure time allows for the system fading another magnitude. ------------------------------------------------------------------------------------------------------------------------------------ 2 V-V442-OPH COS/FUV ACQ/PEA PSA G140L 1105 CENTER=FLUX-WT-FLR, NUM-POS=5, 1 32 S (32 KD STEP-SIZE=0.9 S) Comments: I ran a WD spectrum with Teff=50000K, scaled to FUV=16.8 (as measured from Galex photometry in low state), through the ETC. The exposure time allows for the system fading another magnitude. ------------------------------------------------------------------------------------------------------------------------------------ 3 V-V442-OPH COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=1, 1 812 S (812 G BUFFER-TIME=812 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 4 V-V442-OPH COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=2, 1 812 S (812 G BUFFER-TIME=812 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 5 V-V442-OPH COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=3, 1 1146 S G BUFFER-TIME=1146 (1146 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). 16986( 10) - 27-Nov-2023 16:18:27 - [ 19] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 6 V-V442-OPH COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=4, 1 1146 S G BUFFER-TIME=1146 (1146 S) Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ V-V442-OPH 1 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KXD V-V442-OPH 2 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KD V-V442-OPH 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G V-V442-OPH 4 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G V-V442-OPH 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G V-V442-OPH 6 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G 16986( 10) - 27-Nov-2023 16:18:27 - [ 20] Visit: 0I (S/C visit for visit 04) Visit Requirements: ORIENT 280D TO 85 D On Hold Comments: Additional Comments: This visit allocates and sets up the safe position offset slot for visit 04 which will use that slot. this S/C visit should go 3-5 days before visit 04. This visit will only contain one exposure Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GD-1662 S/C DATA V1 1 5 S (5 S) POS TARG 229.1328, -241.0575; SAVE OFFSET V04SAF; SPEC COM INSTR ECSLOTSET; QESIPARM ANGLE 47.2; QESIPARM DIST 9.723 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ GD-1662 1 S/C DATA V1 none none none none tbd N/A 16986( 10) - 27-Nov-2023 16:18:27 - [ 21] Visit: 0J (BOP visit for visit 04) Visit Requirements: SCHED 100%; ORIENT 280D TO 085 D; BETWEEN 23-OCT-2023:00:00:00 AND 25-NOV-2023:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: LONG-TERM TOO This is one of the targets in which the white dwarf is visible only during a low state. We will trigger the ToO when the occurrence of a low state is detected by our ground-based monitoring. Additional Comments: This visit is for BOP checking the safe target only and should not execute onboard HST. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GD-1662-SAF COS/FUV ACQ/PEA PSA G140L 1105 LIFETIME-POS=LP4 1 27 S (27 E-TARGET KXD S) Comments: I ran a WD spectrum with Teff=50000K, scaled to FUV=16.6 (as measured from IUE data obtained in low state), through the ETC. The exposure time allows for the system fading another magnitude. ------------------------------------------------------------------------------------------------------------------------------------ 2 GD-1662-SAF COS/FUV ACQ/PEA PSA G140L 1105 CENTER=FLUX-WT-FLR, NUM-POS=5, 1 27 S (27 E-TARGET KD STEP-SIZE=0.9, S) LIFETIME-POS=LP4 Comments: I ran a WD spectrum with Teff=50000K, scaled to FUV=16.6 (as measured from IUE data obtained in low state), through the ETC. The exposure time allows for the system fading another magnitude. ------------------------------------------------------------------------------------------------------------------------------------ 3 GD-1662-SAF COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=1, 1 832 S (832 E-TARGET G BUFFER-TIME=361, S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ 4 GD-1662-SAF COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=2, 1 820 S (820 E-TARGET G BUFFER-TIME=361, S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ 5 GD-1662-SAF COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=3, 1 1146 S E-TARGET G BUFFER-TIME=518, (1146 S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 22] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 6 GD-1662-SAF COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=4, 1 1193 S E-TARGET G BUFFER-TIME=541, (1193 S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ GD-1662-SAFE-TARGET 1 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KXD GD-1662-SAFE-TARGET 2 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KD GD-1662-SAFE-TARGET 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G GD-1662-SAFE-TARGET 4 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G GD-1662-SAFE-TARGET 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G GD-1662-SAFE-TARGET 6 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G 16986( 10) - 27-Nov-2023 16:18:27 - [ 23] Visit: 0O (S/C visit for visit 07) Visit Requirements: ORIENT 75D TO 290 D On Hold Comments: Additional Comments: This visit allocates and sets up the safe position offset slot for visit 07 which will use that slot. This S/C visit should go earlier in the week while Visit 07 will be 3-5 days later. The S/C visit will only contain 1 exposure Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 V-KR-AUR S/C DATA V1 1 5 S (5 S) POS TARG 232.723, -237.515; SAVE OFFSET V07SAF; SPEC COM INSTR ECSLOTSET; QESIPARM ANGLE 233; QESIPARM DIST 9.706 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ V-KR-AUR 1 S/C DATA V1 none none none none 1 N/A 16986( 10) - 27-Nov-2023 16:18:27 - [ 24] Visit: 0P (BOP visit for visit 07) Visit Requirements: SCHED 100%; ORIENT 75D TO 290 D; BETWEEN 18-SEP-2021:00:00:00 AND 22-APR-2022:00:00:00; BETWEEN 18-SEP-2022:00:00:00 AND 22-APR-2023:00:00:00; BETWEEN 18-SEP-2023:00:00:00 AND 22-APR-2024:00:00:00; BETWEEN 18-SEP-2024:00:00:00 AND 22-APR-2025:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: LONG-TERM TOO This is one of the targets in which the white dwarf is visible only during a low state. We will trigger the ToO when the occurrence of a low state is detected by our ground-based monitoring. Additional Comments: This visit is for BOP checking the safe target only and should not execute on board HST Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 V-KR-AUR-SA COS/NUV ACQ/IMA PSA MIRRORB 1 35 S (35 FE-TGT GE S) Comments: Computed assuming a WD model with Teff=30000K, scaled to NUV=18 (allowing the target to be fainter by one magnitude compared to previous low state observations obtained with Swift). ------------------------------------------------------------------------------------------------------------------------------------ 2 V-KR-AUR-SA COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=1, 1 967 S (967 FE-TGT G BUFFER-TIME=967, S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 3 V-KR-AUR-SA COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=2, 1 967 S (967 FE-TGT G BUFFER-TIME=967, S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 4 V-KR-AUR-SA COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=3, 1 1146 S FE-TGT G BUFFER-TIME=1146, (1146 S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 25] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 5 V-KR-AUR-SA COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=4, 1 1145 S FE-TGT G BUFFER-TIME=1145, (1145 S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is brighter (which will still be safe, but the buffer would overflow if set to the appropriate value for the low state). ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ V-KR-AUR-SAFE-TGT 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE V-KR-AUR-SAFE-TGT 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G V-KR-AUR-SAFE-TGT 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G V-KR-AUR-SAFE-TGT 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G V-KR-AUR-SAFE-TGT 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G 16986( 10) - 27-Nov-2023 16:18:27 - [ 26] Visit: 54 (GD-1662) Visit Requirements: SCHED 100%; ORIENT 280D TO 85 D; BETWEEN 23-OCT-2023:00:00:00 AND 31-DEC-2023:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: LONG-TERM TOO This is one of the targets in which the white dwarf is visible only during a low state. We will trigger the ToO when the occurrence of a low state is detected by our ground-based monitoring. Additional Comments: This should be scheduled in evening local-time on a thursday or friday. Flags need to be cleared during the work day. Weekends & holidays are to be avoided since the CS must clear the target within 24 hours of HST execution Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GD-1662 COS/FUV ACQ/PEA PSA G140L 1105 LIFETIME-POS=LP4 1 27 S (27 KXD S) Comments: I ran a WD spectrum with Teff=50000K, scaled to FUV=16.6 (as measured from IUE data obtained in low state), through the ETC. The exposure time allows for the system fading another magnitude. ------------------------------------------------------------------------------------------------------------------------------------ 2 GD-1662 COS/FUV ACQ/PEA PSA G140L 1105 CENTER=FLUX-WT-FLR, NUM-POS=5, 1 27 S (27 KD STEP-SIZE=0.9, S) LIFETIME-POS=LP4 Comments: I ran a WD spectrum with Teff=50000K, scaled to FUV=16.6 (as measured from IUE data obtained in low state), through the ETC. The exposure time allows for the system fading another magnitude. ------------------------------------------------------------------------------------------------------------------------------------ 3 GD-1662 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=1, 1 832 S (832 G BUFFER-TIME=361, S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ 4 GD-1662 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=2, 1 820 S (820 G BUFFER-TIME=361, S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ 16986( 10) - 27-Nov-2023 16:18:27 - [ 27] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 5 GD-1662 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=3, 1 1146 S G BUFFER-TIME=518, (1146 S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ 6 GD-1662 COS/FUV TIME-TA PSA G140L 800 FLASH=YES, FP-POS=4, 1 1193 S G BUFFER-TIME=541, (1193 S) LIFETIME-POS=LP3 Comments: Buffer-time set conservatively short in case the system is observed in a brighter state than the low state minimum. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ GD-1662 1 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KXD GD-1662 2 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KD GD-1662 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G GD-1662 4 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G GD-1662 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G GD-1662 6 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G 16986( 10) - 27-Nov-2023 16:18:27 - [ 28] Summary Form for Proposal 16986 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA, V1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV, S/C ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, ACQ/PEAKD, ACQ/PEAKXD, DATA, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1140, BUFFER-TIME=1141, BUFFER-TIME=1145, BUFFER-TIME=1146, BUFFER-TIME=1185, BUFFER-TIME=1186, BUFFER-TIME=1527, BUFFER-TIME=2552, BUFFER-TIME=361, BUFFER-TIME=518, BUFFER-TIME=541, BUFFER-TIME=752, BUFFER-TIME=812, BUFFER-TIME=839, BUFFER-TIME=872, BUFFER-TIME=967, CENTER=FLUX-WT-FLR, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, LIFETIME-POS=LP3, LIFETIME-POS=LP4, NUM-POS=5, STEP-SIZE=0.9 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-SEP-2021:00:00:00 AND 05-APR-2022:00:00:00, BETWEEN 01-SEP-2022:00:00:00 AND 05-APR-2023:00:00:00, BETWEEN 01-SEP-2023:00:00:00 AND 05-APR-2024:00:00:00, BETWEEN 01-SEP-2024:00:00:00 AND 05-APR-2025:00:00:00, BETWEEN 07-MAR-2022:00:00:00 AND 10-OCT-2022:00:00:00, BETWEEN 07-MAR-2023:00:00:00 AND 10-OCT-2023:00:00:00, BETWEEN 07-MAR-2024:00:00:00 AND 10-OCT-2024:00:00:00, BETWEEN 07-MAR-2025:00:00:00 AND 10-OCT-2025:00:00:00, BETWEEN 15-JUN-2021:00:00:00 AND 15-JAN-2022:00:00:00, BETWEEN 15-JUN-2022:00:00:00 AND 15-JAN-2023:00:00:00, BETWEEN 15-JUN-2023:00:00:00 AND 15-JAN-2024:00:00:00, BETWEEN 15-JUN-2024:00:00:00 AND 15-JAN-2025:00:00:00, BETWEEN 18-APR-2021:00:00:00 AND 08-NOV-2021:00:00:00, BETWEEN 18-APR-2022:00:00:00 AND 08-NOV-2022:00:00:00, BETWEEN 18-APR-2023:00:00:00 AND 08-NOV-2023:00:00:00, BETWEEN 18-APR-2024:00:00:00 AND 08-NOV-2024:00:00:00, BETWEEN 18-SEP-2021:00:00:00 AND 22-APR-2022:00:00:00, BETWEEN 18-SEP-2022:00:00:00 AND 22-APR-2023:00:00:00, BETWEEN 18-SEP-2023:00:00:00 AND 22-APR-2024:00:00:00, BETWEEN 18-SEP-2024:00:00:00 AND 22-APR-2025:00:00:00, BETWEEN 23-OCT-2023:00:00:00 AND 25-NOV-2023:00:00:00, BETWEEN 23-OCT-2023:00:00:00 AND 31-DEC-2023:00:00:00, BETWEEN 30-JUN-2021:00:00:00 AND 22-FEB-2022:00:00:00, BETWEEN 30-JUN-2022:00:00:00 AND 22-FEB-2023:00:00:00, BETWEEN 30-JUN-2023:00:00:00 AND 22-FEB-2024:00:00:00, BETWEEN 30-JUN-2024:00:00:00 AND 22-FEB-2025:00:00:00, ON HOLD , ORIENT 280D TO 085 D, ORIENT 280D TO 85 D, ORIENT 75D TO 290 D, POS TARG 229.1328, -241.0575, POS TARG 232.723, -237.515, QESIPARM ANGLE 233, QESIPARM ANGLE 47.2, QESIPARM DIST 9.706, QESIPARM DIST 9.723, SAVE OFFSET V04SAF, SAVE OFFSET V07SAF, SCHED 100%, SPEC COM INSTR ECSLOTSET, TOO RESPONSE TIME 21.0D, USE OFFSET V04SAF, USE OFFSET V07SAF ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names 1RXS-J022917.1-395851, 2MASS-J23375921+4308509, GD-1662, GD-1662-SAFE-TARGET, HS-0506+7725, V-KR-AUR, V-KR-AUR-SAFE-TGT, V-V442-OPH, V-V794-AQL ------------------------------------------------------------------------------------------------------------------------------------