16696( 3) - 07-Sep-2021 15:54:23 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16696 Version: 3 Check-in Time: 07-Sep-2021 15:54:23 STScI Edit Number: 0 Title A dormant black hole or a stripped Helium star in a massive binary system ------------------------------------------------------------------------------------ Type Cycle GO 29 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Hugues Sana Katholieke Universiteit Leuven Y CoI: Dr. Laurent Mahy Katholieke Universiteit Leuven N CoI: Dr. Tomer Shenar Katholieke Universiteit Leuven N CoI: Mr. Michael Abdul-Masih Katholieke Universiteit Leuven N CoI: Dr. Norbert Langer Universitat Bonn, Argelander Institute for N Astronomy CoI: Mr. Matthias Fabry Institute of Astronomy, KU Leuven N CoI: Ms. Julia Bodensteiner Katholieke Universiteit Leuven N CoI: Pablo Ignacio Marchant Campos Institute of Astronomy, KU Leuven N ------------------------------------------------------------------------------------ Abstract The quest for dormant stellar-mass black holes (BHs) in massive binaries (i.e., OB+BH systems) is raging. All the candidates proposed so far have been heavily disputed in the weeks following their report. Combining a literature search and archival spectroscopic data with innovative analysis techniques, we have identified two promising massive binaries harboring unseen companions with masses above the BH-mass limit, and for which simulations could discard the presence of a 5Msun main-sequence stellar companion. Here we request STIS/FUV spectroscopy of the best candidate (that with the heaviest companion mass) to unveil or discard the presence of a hot, Helium stripped star as the unseen companion. A Helium stripped star would indeed contribute very little to the system optical flux, but its contribution would become more significant in the far-UV. Should the proposed observations fail to reveal such hot companion, this project will prove beyond doubt the presence of a BH, with important consequences on the evolution of gravitational-wave progenitors and the debated presence of a kick accompanying BH formation. Either outcome -- either a Helium stripped star or a dormant BH -- will result in a significant leap forward in our understanding of the evolution of massive stars, but only the FUV capabilities of HST can discriminate between both scenarios. ------------------------------------------------------------------------------------ Observations Description ------------------------ 8-epoch FUV/STIS spectroscopy of a single target. 8 visits (1epoch per visit). Phase constraint are given for each observations of this 14d-period binary GA WAVECAL have been manually placed after the science exposure to optimize science exposure duration Impact of reduced-gyro operations on the program: none expected unless the visibility of the visits are strongly reduced 16696( 3) - 07-Sep-2021 15:54:23 - [ 2] BOT: Galex observations are available. Both the GSC&Galex BOT as well as ETC computations confirm the target is safe ------------------------------------------------------------------------------------ 16696( 3) - 07-Sep-2021 15:54:23 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-130298 STAR, GIANT O RA=14H49M33.7650S +/- 0.03", J2000 V = 9.83 U=9.14, G=9.1143 DEC=-56D25'38.47" +/- 0.03" Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -7.785499442238545E-4 -0.001290 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16696( 3) - 07-Sep-2021 15:54:23 - [ 4] Visit: 01 Visit Requirements: Period 14.6316221 D AND ZERO-PHASE HJD2454217.78206 On Hold Comments: 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 HD-130298 STIS/CCD ACQ F25ND3 MIRROR 1 1 S (1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-130298 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 BUFFER-TIME=270, WAVECAL=NO 1 2400 S PHASE .97 TO 0.03 -MAMA G see below (2232 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-130298 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-130298 2 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 none none none none 1 2232.0 S -MAMA G WAVE 3 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 1 N/A -MAMA 16696( 3) - 07-Sep-2021 15:54:23 - [ 5] Visit: 02 Visit Requirements: Period 14.6316221 D AND ZERO-PHASE HJD2454217.78206 On Hold Comments: 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 HD-130298 STIS/CCD ACQ F25ND3 MIRROR 1 1 S (1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-130298 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 BUFFER-TIME=270, WAVECAL=NO 1 2400 S PHASE .03 TO 0.08 -MAMA G see below (2232 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-130298 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-130298 2 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 none none none none 1 2232.0 S -MAMA G WAVE 3 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 1 N/A -MAMA 16696( 3) - 07-Sep-2021 15:54:23 - [ 6] Visit: 03 Visit Requirements: Period 14.6316221 D AND ZERO-PHASE HJD2454217.78206 On Hold Comments: 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 HD-130298 STIS/CCD ACQ F25ND3 MIRROR 1 1 S (1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-130298 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 BUFFER-TIME=270, WAVECAL=NO 1 2400 S PHASE .08 TO 0.2 -MAMA G see below (2232 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-130298 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-130298 2 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 none none none none 1 2232.0 S -MAMA G WAVE 3 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 1 N/A -MAMA 16696( 3) - 07-Sep-2021 15:54:23 - [ 7] Visit: 04 Visit Requirements: Period 14.6316221 D AND ZERO-PHASE HJD2454217.78206 On Hold Comments: 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 HD-130298 STIS/CCD ACQ F25ND3 MIRROR 1 1 S (1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-130298 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 BUFFER-TIME=270, WAVECAL=NO 1 2400 S PHASE .2 TO 0.4 -MAMA G see below (2232 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-130298 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-130298 2 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 none none none none 1 2232.0 S -MAMA G WAVE 3 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 1 N/A -MAMA 16696( 3) - 07-Sep-2021 15:54:23 - [ 8] Visit: 05 Visit Requirements: Period 14.6316221 D AND ZERO-PHASE HJD2454217.78206 On Hold Comments: 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 HD-130298 STIS/CCD ACQ F25ND3 MIRROR 1 1 S (1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-130298 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 BUFFER-TIME=270, WAVECAL=NO 1 2400 S PHASE .4 TO 0.6 -MAMA G see below (2232 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-130298 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-130298 2 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 none none none none 1 2232.0 S -MAMA G WAVE 3 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 1 N/A -MAMA 16696( 3) - 07-Sep-2021 15:54:23 - [ 9] Visit: 06 Visit Requirements: Period 14.6316221 D AND ZERO-PHASE HJD2454217.78206 On Hold Comments: 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 HD-130298 STIS/CCD ACQ F25ND3 MIRROR 1 1 S (1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-130298 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 BUFFER-TIME=270, WAVECAL=NO 1 2400 S PHASE .6 TO 0.85 -MAMA G see below (2232 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-130298 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-130298 2 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 none none none none 1 2232.0 S -MAMA G WAVE 3 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 1 N/A -MAMA 16696( 3) - 07-Sep-2021 15:54:23 - [ 10] Visit: 07 Visit Requirements: Period 14.6316221 D AND ZERO-PHASE HJD2454217.78206 On Hold Comments: 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 HD-130298 STIS/CCD ACQ F25ND3 MIRROR 1 1 S (1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-130298 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 BUFFER-TIME=270, WAVECAL=NO 1 2400 S PHASE .85 TO 0.92 -MAMA G see below (2232 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-130298 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-130298 2 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 none none none none 1 2232.0 S -MAMA G WAVE 3 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 1 N/A -MAMA 16696( 3) - 07-Sep-2021 15:54:23 - [ 11] Visit: 08 Visit Requirements: Period 14.6316221 D AND ZERO-PHASE HJD2454217.78206 On Hold Comments: 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 HD-130298 STIS/CCD ACQ F25ND3 MIRROR 1 1 S (1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-130298 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 BUFFER-TIME=270, WAVECAL=NO 1 2400 S PHASE .92 TO 0.97 -MAMA G see below (2232 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-130298 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-130298 2 STIS/FUV TIME-TA 0.2X0.2 E140M 1425 none none none none 1 2232.0 S -MAMA G WAVE 3 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 1 N/A -MAMA 16696( 3) - 07-Sep-2021 15:54:23 - [ 12] Summary Form for Proposal 16696 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.2, F25ND3 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=270, WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PHASE .03 TO 0.08, PHASE .08 TO 0.2, PHASE .2 TO 0.4, PHASE .4 TO 0.6, PHASE .6 TO 0.85, PHASE .85 TO 0.92, PHASE .92 TO 0.97, PHASE .97 TO 0.03, Period 14.6316221 D AND ZERO-PHASE HJD2454217.78206 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements E140M, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD-130298, WAVE ------------------------------------------------------------------------------------------------------------------------------------