16034( 3) - 04-Nov-2019 17:30:37 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16034 Version: 3 Check-in Time: 04-Nov-2019 17:30:37 STScI Edit Number: 0 Title Dissecting the evaporating atmosphere of a giant planet in a close orbit around a white dwarf with COS ultraviolet spectroscopy ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Boris T. Gaensicke The University of Warwick Y CoI: Prof. Detlev G. Koester Universitat Kiel N CoI: Dr. Christopher James Manser The University of Warwick N CoI: Prof. Matthias R. Schreiber Universidad de Valparaiso N CoI: Dr. Odette Fabiola Toloza The University of Warwick N Castillo CoI: Dr. Nicola Gentile Fusillo The University of Warwick N ------------------------------------------------------------------------------------ Abstract We have identified the first white dwarf that is photo-evaporating a close-in giant planet. The atmospheric material lost by the planet is detected via H, O, and S emission lines from a gaseous circumstellar disk, and we detect O and S in the white dwarf photosphere, indicating ongoing accretion from this disk. The accretion rate onto the white dwarf is ~3.3e9g/s, comparable to the mass loss rates of warm Neptunes. With a sub-solar upper limit of log(C/O)<-0.8, this planet may resemble warm low-metallicity Neptunes, such as HAT-P-26b. The discovery of this system opens up the unprecedented opportunity to determine the atmospheric composition of a highly irradiated gas giant via spectroscopy of the material accreted by the white dwarf, and compare the resulting abundances with planetary atmosphere models. Optical spectroscopy is limited by the lack of strong metal transitions, and hence HST's access to the far-ultraviolet is critically important for this study. We therefore propose deep COS spectroscopy to measure the abundances, or derive upper limits, of C, N, Al, Si, P, Cl, Ti, V, Cr, Mn, Fe and Ni. These elements span the majority of atmospheric species and cloud condensates that may be present in the atmosphere of the planet. This program should not be affected should HST move to a 2-gyro mode. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal of these observations is to obtain a high signal-to-noise far-ultraviolet spectrum of the white dwarf WDJ0914+1914, which hosts, and evaporates a close-in giant planet. Some of the atmospheric material accretes onto the white dwarf, and the planned COS spectroscopy will be used to measure the abundances of that material from the sharp photospheric metal lines. We use the G130M grating with two central wavelengths to maximise the wavelength covered by these observations, and to achieve gap-less coverage. We make use of all permitted FP-POS positions, i.e. 3 & 4 for @1291A, and 1, 2, 3, 4 @ 1222A. 16034( 3) - 04-Nov-2019 17:30:37 - [ 2] The expected period of the planet is ~15 days, and there is a chance that part of the evaporating atmosphere crosses our line-of-sight onto the white dwarf, which would result in the transient appearence of resonance absorption lines of O, S, C, or N. We therefore plan the observations as ten individual orbits with a separation of 1.3-1.7 days between them. ------------------------------------------------------------------------------------ 16034( 3) - 04-Nov-2019 17:30:37 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WDJ091405.30 STAR, DA RA=09H14M5.3030S +/- 0.0006961", J2000 V = 18.8 +/- 0.1 GALEX FUV=17.77 +- +191412.25 DEC=+19D14'12.07" +/- 0.0007547" 0.06 Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 -8.621368912897212E-5 -0.011594 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16034( 3) - 04-Nov-2019 17:30:37 - [ 4] Visit: 01 Visit Requirements: 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 WDJ091405.3 COS/NUV ACQ/IMA PSA MIRRORA 1 3 S (3 S) 0+191412.25 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ091405.3 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2445, FP-POS=3 1 2445 S 0+191412.25 G (2445 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ091405.30+191412 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A .25 GE WDJ091405.30+191412 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A .25 G 16034( 3) - 04-Nov-2019 17:30:37 - [ 5] Visit: 02 Visit Requirements: AFTER 01 BY 1.3 D TO 1.7 D 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 WDJ091405.3 COS/NUV ACQ/IMA PSA MIRRORA 1 3 S (3 S) 0+191412.25 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ091405.3 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2445, FP-POS=4 1 2445 S 0+191412.25 G (2445 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ091405.30+191412 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A .25 GE WDJ091405.30+191412 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A .25 G 16034( 3) - 04-Nov-2019 17:30:37 - [ 6] Visit: 03 Visit Requirements: AFTER 02 BY 1.3 D TO 1.7 D 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 WDJ091405.3 COS/NUV ACQ/IMA PSA MIRRORA 1 3 S (3 S) 0+191412.25 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ091405.3 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2445, FP-POS=3 1 2445 S 0+191412.25 G (2445 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ091405.30+191412 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A .25 GE WDJ091405.30+191412 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A .25 G 16034( 3) - 04-Nov-2019 17:30:37 - [ 7] Visit: 04 Visit Requirements: AFTER 03 BY 1.3 D TO 1.7 D 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 WDJ091405.3 COS/NUV ACQ/IMA PSA MIRRORA 1 3 S (3 S) 0+191412.25 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ091405.3 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2445, FP-POS=4 1 2445 S 0+191412.25 G (2445 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ091405.30+191412 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A .25 GE WDJ091405.30+191412 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A .25 G 16034( 3) - 04-Nov-2019 17:30:37 - [ 8] Visit: 05 Visit Requirements: AFTER 04 BY 1.3 D TO 1.7 D 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 WDJ091405.3 COS/NUV ACQ/IMA PSA MIRRORA 1 3 S (3 S) 0+191412.25 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ091405.3 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2445, FP-POS=3 1 2445 S 0+191412.25 G (2445 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ091405.30+191412 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A .25 GE WDJ091405.30+191412 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A .25 G 16034( 3) - 04-Nov-2019 17:30:37 - [ 9] Visit: 06 Visit Requirements: AFTER 05 BY 1.3 D TO 1.7 D 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 WDJ091405.3 COS/NUV ACQ/IMA PSA MIRRORA 1 3 S (3 S) 0+191412.25 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ091405.3 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2430, FP-POS=1 1 2430 S 0+191412.25 G (2430 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ091405.30+191412 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A .25 GE WDJ091405.30+191412 2 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A .25 G 16034( 3) - 04-Nov-2019 17:30:37 - [ 10] Visit: 07 Visit Requirements: AFTER 06 BY 1.3 D TO 1.7 D 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 WDJ091405.3 COS/NUV ACQ/IMA PSA MIRRORA 1 3 S (3 S) 0+191412.25 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ091405.3 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2430, FP-POS=2 1 2430 S 0+191412.25 G (2430 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ091405.30+191412 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A .25 GE WDJ091405.30+191412 2 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A .25 G 16034( 3) - 04-Nov-2019 17:30:37 - [ 11] Visit: 08 Visit Requirements: AFTER 07 BY 1.3 D TO 1.7 D 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 WDJ091405.3 COS/NUV ACQ/IMA PSA MIRRORA 1 3 S (3 S) 0+191412.25 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ091405.3 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2430, FP-POS=3 1 2430 S 0+191412.25 G (2430 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ091405.30+191412 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A .25 GE WDJ091405.30+191412 2 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A .25 G 16034( 3) - 04-Nov-2019 17:30:37 - [ 12] Visit: 09 Visit Requirements: AFTER 08 BY 1.3 D TO 1.7 D 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 WDJ091405.3 COS/NUV ACQ/IMA PSA MIRRORA 1 3 S (3 S) 0+191412.25 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ091405.3 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2430, FP-POS=4 1 2430 S 0+191412.25 G (2430 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ091405.30+191412 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A .25 GE WDJ091405.30+191412 2 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A .25 G 16034( 3) - 04-Nov-2019 17:30:37 - [ 13] Visit: 10 Visit Requirements: AFTER 09 BY 1.3 D TO 1.7 D 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 WDJ091405.3 COS/NUV ACQ/IMA PSA MIRRORA 1 3 S (3 S) 0+191412.25 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ091405.3 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2430, FP-POS=1 1 2430 S 0+191412.25 G (2430 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ091405.30+191412 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A .25 GE WDJ091405.30+191412 2 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A .25 G 16034( 3) - 04-Nov-2019 17:30:37 - [ 14] Summary Form for Proposal 16034 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=2430, BUFFER-TIME=2445, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 1.3 D TO 1.7 D, AFTER 02 BY 1.3 D TO 1.7 D, AFTER 03 BY 1.3 D TO 1.7 D, AFTER 04 BY 1.3 D TO 1.7 D, AFTER 05 BY 1.3 D TO 1.7 D, AFTER 06 BY 1.3 D TO 1.7 D, AFTER 07 BY 1.3 D TO 1.7 D, AFTER 08 BY 1.3 D TO 1.7 D, AFTER 09 BY 1.3 D TO 1.7 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names WDJ091405.30+191412.25 ------------------------------------------------------------------------------------------------------------------------------------