17272( 3) - 20-Nov-2023 13:29:14 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17272 Version: 3 Check-in Time: 20-Nov-2023 13:29:14 STScI Edit Number: 0 Title A transient outflow in the short-period binary UW CrB ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Ms. Stefanie Fijma Universiteit van Amsterdam Y CoI: Dr. Nathalie Degenaar Universiteit van Amsterdam N CoI: Dr. Noel Castro Segura University of Southampton N CoI: Dr. Juan V. Hernandez Santisteban University of St. Andrews N CoI: Prof. Christian Knigge University of Southampton N CoI: Prof. Thomas J. Maccarone Texas Tech University N CoI: Montserrat Armas Padilla Universiteit van Amsterdam N CoI: Dr. Teo Munoz Darias Instituto de Astrofisica de Canarias N CoI: Dr. Daniel Mata Sanchez University of Manchester N ------------------------------------------------------------------------------------ Abstract Studying outflows of X-ray binaries is important for understanding the physics of accretion, the evolution of compact binaries, and dynamics of the local interstellar medium. UW CrB is a high-inclination low-mass X-ray binary with an orbital period of 111 min, for which we have recently identified a transient UV outflow and which shows hints of outflows at X-ray and optical wavelengths. We propose a comprehensive XMM-Newton (120 ks), HST (6 orbits) and VLT (6 hr) campaign to investigate the transient and multi-wavelength character of the outflow in UW CrB, aiming to determine the nature and physical properties of the outflow. Our proposed study will greatly enhance our general understanding of outflows in low-mass X-ray binaries. ------------------------------------------------------------------------------------ Observations Description ------------------------ This programme consists of 6 HST orbits, spread over 3 visits that consist of 2 orbits each. Each first orbit will consist of an ACQ/IMAGE taken with COS/NUV and complemented with the spectroscopic exposures taken with the COS/FUV G140L. The source position is accurately known (to within 0.2 arcsec; Gaia EDR3), so target acquisition can be performed using ACQ/IMAGE (a S/N of 50 is obtained for a 10-s exposure; ECT ID COS.ta.1836992). We will use the 1105 A setting that provides continuous coverage between 1118-2251 A in segment A, while segment B is switched off. With this setup, a 1150-s exposure for COS yields a S/N~5 (ETC ID: COS.sp.1837003). We will be using different FP-POS positions to reduce fixed-pattern noise and to minimise long-term gain sag. # Comment on reduced gyro operations Since our program concerns simple orbit-long integrations with a single instrument/setup, the impact of reduced gyro operations on our HST science exposures is very minor. If needed we can increase the target acquisition time. We gladly accept advice on this. 17272( 3) - 20-Nov-2023 13:29:14 - [ 2] Our program does reply on obtaining (partly) simultaneous observations with VLT and XMM-Newton (as detailed below), hence our HST observations are time critical. This may be impacted by the reduced field of regard and hence requires careful consideration. # Notes with regards to scheduling: This programme is part of a simultaneous multi-wavelength campaign with the HST, XMM-Newton and VLT/XShooter observatories. The preferred window to coordinate with XMM-Newton and VLT/XShooter is between 17 and 22 July 2023. As mentioned before, the programme consists of 6 HST orbits, spread over 3 visits that consist of 2 orbits each. We aim to plan these visits in order to efficiently cover the entire orbital phase of our source (P~111 min) at least two times. We also aim to coordinate two of the HST visits with VLT, where the VLT observations consist of 6 hours spread equally over two consecutive days, and all of them within the XMM-Newton exposure of 120ks, to achieve our science goal of obtaining a time-resolved full SED of the system. We gladly accept advice on the optimal scheduling of our observations to achieve (partly) simulteneity with our VLT and XMM-Newton observations and to maximize the binary orbital coverage of our target. Given the orbital period of our system, this requires some careful consideration. ------------------------------------------------------------------------------------ 17272( 3) - 20-Nov-2023 13:29:14 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 V-UW-CRB STAR, LMXB, NEUTRON RA=16H05M45.8795S +/- 0.13", J2000 V = 19.7 +/- 0.2 STAR, X-RAY BURSTER DEC=+25D51'45.14" +/- 0.22" Reference Frame: Other: SIMBAD Extended: NO Comments: 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 3.127952476647745E-4 -0.006624999991799996 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17272( 3) - 20-Nov-2023 13:29:14 - [ 4] Visit: 01 (First visit (+VLT+XMM)) Visit Requirements: On Hold Comments: Additional Comments: This is the first visit, it will be performed simultaneously with VLT/X-Shooter and XMM-Newton. The tighter constrains comes from the visibility of the former. 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-UW-CRB COS/NUV ACQ/IMA PSA MIRRORA 1 10 S (10 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=1, BUFFER-TIME=750 1 1141 S G (1141 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=2, BUFFER-TIME=1200 1 1141 S G (1141 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=3, BUFFER-TIME=1150 1 1297 S G (1297 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=4, BUFFER-TIME=1200 1 1297 S G (1297 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-UW-CRB 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE V-UW-CRB 2 COS/FUV TIME-TA PSA G140L 1105 none none none none 1 N/A G V-UW-CRB 3 COS/FUV TIME-TA PSA G140L 1105 none none none none 1 N/A G V-UW-CRB 4 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 N/A G V-UW-CRB 5 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 N/A G 17272( 3) - 20-Nov-2023 13:29:14 - [ 5] Visit: 02 (Second visit (+XMM)) Visit Requirements: On Hold Comments: Additional Comments: This is the second visit, which will be simultaneous with XMM-Newton but not with VLT (due to visibility). 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-UW-CRB COS/NUV ACQ/IMA PSA MIRRORA 1 10 S (10 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=1, BUFFER-TIME=750 1 1141 S G (1141 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=2, BUFFER-TIME=1200 1 1141 S G (1141 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=3, BUFFER-TIME=1150 1 1297 S G (1297 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=4, BUFFER-TIME=1200 1 1297 S G (1297 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-UW-CRB 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE V-UW-CRB 2 COS/FUV TIME-TA PSA G140L 1105 none none none none 1 N/A G V-UW-CRB 3 COS/FUV TIME-TA PSA G140L 1105 none none none none 1 N/A G V-UW-CRB 4 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 N/A G V-UW-CRB 5 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 N/A G 17272( 3) - 20-Nov-2023 13:29:14 - [ 6] Visit: 03 (Third visit (+VLT+XMM)) Visit Requirements: On Hold Comments: Additional Comments: This is the third visit, it will be performed simultaneously with VLT/X-Shooter and XMM-Newton. The tighter constrains comes from the visibility of the former. 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-UW-CRB COS/NUV ACQ/IMA PSA MIRRORA 1 10 S (10 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=1, BUFFER-TIME=750 1 1141 S G (1141 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=2, BUFFER-TIME=1200 1 1141 S G (1141 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=3, BUFFER-TIME=1150 1 1297 S G (1297 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=4, BUFFER-TIME=1200 1 1297 S G (1297 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-UW-CRB 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE V-UW-CRB 2 COS/FUV TIME-TA PSA G140L 1105 none none none none 1 N/A G V-UW-CRB 3 COS/FUV TIME-TA PSA G140L 1105 none none none none 1 N/A G V-UW-CRB 4 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 N/A G V-UW-CRB 5 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 N/A G 17272( 3) - 20-Nov-2023 13:29:14 - [ 7] Visit: 04 (Second visit (+XMM)) Visit Requirements: On Hold Comments: Additional Comments: This is the second visit, which will be simultaneous with XMM-Newton but not with VLT (due to visibility). 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-UW-CRB COS/NUV ACQ/IMA PSA MIRRORA 1 10 S (10 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=1, BUFFER-TIME=750 1 1141 S G see below (1105 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=2, BUFFER-TIME=1200 1 1141 S G see below (1105 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=3, BUFFER-TIME=1150 1 1297 S G see below (1286 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 V-UW-CRB COS/FUV TIME-TA PSA G140L 1105 FP-POS=4, BUFFER-TIME=1200 1 1297 S G see below (1286 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-UW-CRB 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE V-UW-CRB 2 COS/FUV TIME-TA PSA G140L 1105 none none none none 1 1105.0 S G V-UW-CRB 3 COS/FUV TIME-TA PSA G140L 1105 none none none none 1 1105.0 S G V-UW-CRB 4 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 1286.0 S G V-UW-CRB 5 COS/FUV TIME-TA PSA G140L 1105 none none none none 2 1286.0 S G 17272( 3) - 20-Nov-2023 13:29:14 - [ 8] Summary Form for Proposal 17272 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1150, BUFFER-TIME=1200, BUFFER-TIME=750, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names V-UW-CRB ------------------------------------------------------------------------------------------------------------------------------------