15703( 23) - 30-Jul-2019 21:40:34 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15703 Version: 23 Check-in Time: 30-Jul-2019 21:40:34 STScI Edit Number: 21 Title Determining the Cooling Curve of the Unique Extreme Amplitude Dwarf Nova V386 Ser Containing an Accreting, Pulsating White Dwarf. ------------------------------------------------------------------------------------ Type Cycle GO 26 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Paula Szkody University of Washington Y CoI: Prof. Boris T. Gaensicke The University of Warwick N CoI: Dr. Odette Fabiola Toloza The University of Warwick N Castillo CoI: Prof. Edward M. Sion Villanova University N CoI: Dr. Patrick Godon Villanova University N CoI: Dr. Stella Kafka American Association Of Variable Star N Observers ------------------------------------------------------------------------------------ Abstract V386 Ser is a relatively rare close binary containing a well-studied (at quiescence) accreting, pulsating white dwarf that underwent its first known extreme amplitude dwarf nova outburst in January, 2019, and we request a short COS observation to measure the temperature of the white dwarf as soon as possible after the outburst. Since 2004, it has been pulsating at a period of 609 sec, which is known to be a triplet with a spacing indicating a puzzling extremely slow rotation for an accreting white dwarf. The only other pulsating white dwarf that went into a superoutburst and has been followed up with HST is GW Lib. That data revealed an unusually long and non-monotonic cooling time as well as changing modes of pulsation during its decline. However, the monitoring of GW Lib only started 3 yrs past its outburst. V386 Ser presents the unique opportunity to obtain the optimum measurement of the heating within a few months of the outburst when the accretion disk has dissipated enough to view the white dwarf. Obtaining this measurement in the UV with COS will constrain the cooling curve (hence the amount of accretion that took place) and how possible spinup from this accretion impacts the pulsation structure in the interior versus atmospheric rotation. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use COS with the G140L grating to obtain time-tag spectra during 2 HST orbits of the pulsating white dwarf in the close binary V386 Ser. In January, 2019, V386 Ser underwent its first dwarf nova outburst since its discovery in 2002. Our goal is to obtain a temperature as soon as possible now that the system has faded back toward quiescence and we can view how much the white dwarf has been heated by the outburst. A quiescent very low resolution spectrum was obtained by HST using the SBC on June 30, 2005 when STIS was out of service ( Program 10233, observation J84E02021). Since we want to cover as much of the Far UV as possible, we will use the new 800 central wavelength. Target acquisition will be done using the ACQ/IMAGE in the NUV. The time-tag data will be used to 15703( 23) - 30-Jul-2019 21:40:34 - [ 2] search for the quiescent pulsation period of 608 sec or longer periods such as those evident in GW Lib after its outburst. The time-tag spectra will also allow removing the orbital motion of the white dwarf in order to obtain the best value for the white dwarf rotation from the Doppler broadened UV absorption lines of Si and C. Because the cooling curve of the white dwarf is best determined if we can observe soon after the white dwarf is visible (the disk has decreased its outburst luminosity), the best observation times would be May-June. This is also the time when the optical can be observed from the ground, allowing the ratio of UV/opt amplitude of any pulsations to be determined, which can determine the mode of pulsation. This is the first outburst since the discovery 19 years ago, so the outburst period is several decades. However, we will determine the precise quiescent optical magnitude within 24 hrs of the HST observation as done in the past for normal dwarf novae. As of March 31, the object is at 17.5 mag, returning to its quiescent value of g=19. ------------------------------------------------------------------------------------ 15703( 23) - 30-Jul-2019 21:40:34 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 V-V386-SER STAR, DWARF NOVA, RA=16H10M33.6206S +/- 0.28", J2000 V = 18.9 +/- 1.0 INTERACTING BINARY, DEC=-01D02'23.51" +/- 0.24" PULSATING VARIABLE Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database.This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 -5.34554702006616E-4 -0.01910200003294449 0.00415 ------------------------------------------------------------------------------------------------------------------------------------ 2 V-V386-SER-S UNIDENTIFIED, BLANK RA-OFF=0S, DEC-OFF=9.75", FROM 1 J2000 V = 16.5 +/- 0.5 AFE FIELD Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 3 V-V386-SER-S UNIDENTIFIED, BLANK RA-OFF=0.2S, DEC-OFF=9.4", FROM J2000 V = 16.5 +/- 0.5 AFE-2 FIELD 1 Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 15703( 23) - 30-Jul-2019 21:40:34 - [ 4] Visit: 01 (V386-Ser) Visit Requirements: ORIENT 190D TO 88 D; AFTER 02 BY 2 D TO 4 D; BEFORE 15-JUN-2019:00:00:00; Period 1 D AND ZERO-PHASE HJD2457083.417; VISIBILITY INTERVAL 48 M On Hold Comments: Additional Comments: This should be scheduled during the evening - Baltimore time. Offset flags need to be cleared during the work day. The PHASE requirement will enforce this. ORIENT is to avoid the possibility of a nearby object landing near the COS Bright Object Aperture. 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-V386-SER COS/NUV ACQ/IMA PSA MIRRORB 1 50 S (50 PHASE 0 TO 0.5; USE GE S) OFFSET 01SAFE ------------------------------------------------------------------------------------------------------------------------------------ 2 V-V386-SER COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1051, FP-POS=1, 1 1161 S USE OFFSET 01SAFE G FLASH=YES see below (975 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-V386-SER COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=990, FP-POS=2, 1 1100 S USE OFFSET 01SAFE G FLASH=YES see below (914 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 V-V386-SER COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1225, FP-POS=3, 1 1335 S USE OFFSET 01SAFE G FLASH=YES see below (1166 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 V-V386-SER COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1226, FP-POS=4, 1 1336 S USE OFFSET 01SAFE G FLASH=YES see below (1167 S) ------------------------------------------------------------------------------------------------------------------------------------ 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-V386-SER 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE V-V386-SER 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 975.0 S G V-V386-SER 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 914.0 S G V-V386-SER 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 1166.0 S G V-V386-SER 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 1167.0 S G 15703( 23) - 30-Jul-2019 21:40:34 - [ 5] Visit: 02 Visit Requirements: Period 7 D AND ZERO-PHASE HJD2457082.5 On Hold Comments: Additional Comments: This visit allocates and sets up the safe position offset slot for visit 01 which will use that slot. This S/C visit should go earlier in the week while visit 01 will be at least 3 days later. The PHASE requirement will ensure that the visit is sheduled on a Monday. 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-V386-SER S/C POINTIN V1 1 5 S (5 S) POS TARG 229.1328, G -241.0575; PHASE 0.143 TO 0.429; SAVE OFFSET 01SAFE; SPEC COM INSTR ECSLOTSET; QESIPARM ANGLE 0; QESIPARM DIST 9.75 ------------------------------------------------------------------------------------------------------------------------------------ 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-V386-SER 1 S/C POINTIN V1 none none none none 1 N/A G 15703( 23) - 30-Jul-2019 21:40:34 - [ 6] Visit: 03 (V386-Ser-Safe) Visit Requirements: ORIENT 190D TO 88 D On Hold Comments: 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 V-V386-SER- COS/NUV ACQ/IMA PSA MIRRORB 1 50 S (50 SAFE GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 V-V386-SER- COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1051, FP-POS=1, 1 1161 S SAFE G FLASH=YES (1161 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-V386-SER- COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=990, FP-POS=2, 1 1100 S SAFE G FLASH=YES (1100 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 V-V386-SER- COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1225, FP-POS=3, 1 1335 S SAFE G FLASH=YES (1335 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 V-V386-SER- COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1226, FP-POS=4, 1 1336 S SAFE G FLASH=YES (1336 S) ------------------------------------------------------------------------------------------------------------------------------------ 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-V386-SER-SAFE 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE V-V386-SER-SAFE 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G V-V386-SER-SAFE 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G V-V386-SER-SAFE 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G V-V386-SER-SAFE 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G 15703( 23) - 30-Jul-2019 21:40:34 - [ 7] Visit: 11 (V386-Ser) Visit Requirements: ORIENT 210D TO 100 D; AFTER 12 BY 2 D TO 14 D; BETWEEN 05-AUG-2019:00:00:00 AND 10-AUG-2019:00:00:00; BETWEEN 12-AUG-2019:00:00:00 AND 17-AUG-2019:00:00:00; BETWEEN 19-AUG-2019:00:00:00 AND 24-AUG-2019:00:00:00; Period 1 D AND ZERO-PHASE HJD2457083.417; VISIBILITY INTERVAL 48 M On Hold Comments: Additional Comments: This should be scheduled during the evening - Baltimore time. Offset flags need to be cleared during the work day. The PHASE requirement will enforce this. ORIENT is to avoid the possibility of a nearby object landing near the COS Bright Object Aperture. 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-V386-SER COS/NUV ACQ/IMA PSA MIRRORB 1 50 S (50 PHASE 0 TO 0.5; USE GE S) OFFSET 11SAFE ------------------------------------------------------------------------------------------------------------------------------------ 2 V-V386-SER COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1051, FP-POS=1, 1 1161 S USE OFFSET 11SAFE G FLASH=YES see below (975 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-V386-SER COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=990, FP-POS=2, 1 1100 S USE OFFSET 11SAFE G FLASH=YES see below (914 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 V-V386-SER COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1225, FP-POS=3, 1 1335 S USE OFFSET 11SAFE G FLASH=YES see below (1166 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 V-V386-SER COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1226, FP-POS=4, 1 1336 S USE OFFSET 11SAFE G FLASH=YES see below (1167 S) ------------------------------------------------------------------------------------------------------------------------------------ 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-V386-SER 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE V-V386-SER 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 975.0 S G V-V386-SER 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 914.0 S G V-V386-SER 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 1166.0 S G V-V386-SER 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 1167.0 S G 15703( 23) - 30-Jul-2019 21:40:34 - [ 8] Visit: 12 Visit Requirements: Period 7 D AND ZERO-PHASE HJD2457082.5 On Hold Comments: Additional Comments: This visit allocates and sets up the safe position offset slot for visit 01 which will use that slot. This S/C visit should go earlier in the week while visit 01 will be at least 3 days later. The PHASE requirement will ensure that the visit is scheduled on a Monday. 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-V386-SER S/C POINTIN V1 1 5 S (5 S) POS TARG 229.1328, G -241.0575; PHASE 0.143 TO 0.429; SAVE OFFSET 11SAFE; SPEC COM INSTR ECSLOTSET; GS ACQ SCENARIO BASE1BE; QESIPARM ANGLE 0; QESIPARM DIST 9.75 ------------------------------------------------------------------------------------------------------------------------------------ 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-V386-SER 1 S/C POINTIN V1 none none none none 1 N/A G 15703( 23) - 30-Jul-2019 21:40:34 - [ 9] Visit: 13 (V386-Ser-Safe-2) Visit Requirements: ORIENT 210D TO 100 D On Hold Comments: 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 V-V386-SER- COS/NUV ACQ/IMA PSA MIRRORB 1 50 S (50 SAFE-2 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 V-V386-SER- COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1051, FP-POS=1, 1 1161 S SAFE-2 G FLASH=YES (1161 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-V386-SER- COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=990, FP-POS=2, 1 1100 S SAFE-2 G FLASH=YES (1100 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 V-V386-SER- COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1225, FP-POS=3, 1 1335 S SAFE-2 G FLASH=YES (1335 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 V-V386-SER- COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=1226, FP-POS=4, 1 1336 S SAFE-2 G FLASH=YES (1336 S) ------------------------------------------------------------------------------------------------------------------------------------ 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-V386-SER-SAFE-2 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE V-V386-SER-SAFE-2 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G V-V386-SER-SAFE-2 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A G V-V386-SER-SAFE-2 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G V-V386-SER-SAFE-2 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A G 15703( 23) - 30-Jul-2019 21:40:34 - [ 10] Summary Form for Proposal 15703 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA, V1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV, S/C ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, POINTING, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1051, BUFFER-TIME=1225, BUFFER-TIME=1226, BUFFER-TIME=990, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 02 BY 2 D TO 4 D, AFTER 12 BY 2 D TO 14 D, BEFORE 15-JUN-2019:00:00:00, BETWEEN 05-AUG-2019:00:00:00 AND 10-AUG-2019:00:00:00, BETWEEN 12-AUG-2019:00:00:00 AND 17-AUG-2019:00:00:00, BETWEEN 19-AUG-2019:00:00:00 AND 24-AUG-2019:00:00:00, GS ACQ SCENARIO BASE1BE, ORIENT 190D TO 88 D, ORIENT 210D TO 100 D, PHASE 0 TO 0.5, PHASE 0.143 TO 0.429, POS TARG 229.1328, -241.0575, Period 1 D AND ZERO-PHASE HJD2457083.417, Period 7 D AND ZERO-PHASE HJD2457082.5, QESIPARM ANGLE 0, QESIPARM DIST 9.75, SAVE OFFSET 01SAFE, SAVE OFFSET 11SAFE, SPEC COM INSTR ECSLOTSET, USE OFFSET 01SAFE, USE OFFSET 11SAFE, VISIBILITY INTERVAL 48 M ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names V-V386-SER, V-V386-SER-SAFE, V-V386-SER-SAFE-2 ------------------------------------------------------------------------------------------------------------------------------------