16070( 3) - 06-Apr-2020 17:53:43 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16070 Version: 3 Check-in Time: 06-Apr-2020 17:53:43 STScI Edit Number: 0 Title Exploring evolved planetary systems: three new debris discsHST ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Nicola Gentile Fusillo European Southern Observatory - Germany Y CoI: Prof. Boris T. Gaensicke The University of Warwick N CoI: Prof. Detlev G. Koester Universitat Kiel N CoI: Dr. Odette Fabiola Toloza The University of Warwick N Castillo CoI: Dr. Christopher James Manser The University of Warwick N CoI: Dr. Erik Dennihy Gemini Observatory, Southern Operations N ------------------------------------------------------------------------------------ Abstract It is now established that planets survive the evolution of their host star into a white dwarf. Planetary remnants around a number of these ancient stars are revealed by compact debris disks, formed from the tidal disruption of planetesimals, which are detectable as IR flux excess. Accretion from these disks results in metal pollution of the otherwise pristine H or He white dwarf atmospheres, and the analysis of adequate optical and UV spectroscopy of these systems allows to reconstruct the bulk composition of the disrupted planetesimals. Quantitative insight into the structure, formation and evolution of the parent bodies arises from mineralogical studies of the dusty disks, but requires sensitive IR spectroscopy which is currently available only for one single system. Even though the imminent launch of JWST will greatly improve the IR spectroscopic capabilities, the analysis will remain subject to degeneracies due to the relatively flat and broad features of different dust components. However, with the elemental abundances of the dust in hand, established from HST/COS observations of the same systems, these degeneracies can be broken, and will dramatically augment our knowledge of the composition and structure of rocky exo-planets. We have identified three new debris disks, and request here a modest amount of COS mid-cycle spectroscopy to fully characterise the elemental abundances of the dust in time for JWST Cycle 2 proposals. Cycle 28 observations will, at best, leave little time for the required analysis, but more likely slip beyond the JWST Cycle 2 deadline. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal of these observations is to obtain high signal-to-noise far-ultraviolet spectra of three white dwarfs which are accreting planetary debris from circumstellar debris disks. The planned COS spectroscopy will be used to measure the abundances of that material from the sharp photospheric metal lines. 16070( 3) - 06-Apr-2020 17:53:43 - [ 2] 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. The @1291A and @1222A observations are split into two separate visits to facilitate the scheduling. This program should not be affected in case that HST moves to a 2-gyro mode. ------------------------------------------------------------------------------------ 16070( 3) - 06-Apr-2020 17:53:43 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WDJ034736.69 STAR, DA RA=03H47M36.7000S +/- 0.05", J2000 V = 16.65 +/- 0.1 GALEX FUV=16.0415 +162409.73 DEC=+16D24'8.76" +/- 0.05" GALEX NUV=16.4401 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 3.947314542094529E-4 -0.062903 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ045030.91 STAR, DA RA=04H50M30.9600S +/- 0.05", J2000 V = 17.8 GALEX FUV=16.9069 GALEX -284602.29 DEC=-28D46'2.22" +/- 0.05" NUV=17.2377 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 0.0036262072759152054 0.004081 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 3 WDJ193036.05 STAR, DA RA=19H30M36.1100S +/- 0.05", J2000 V = 16.4 +/- 0.1 GALEX FUV=15.8816 -112948.72 DEC=-11D29'49.09" +/- 0.05" GALEX NUV=16.1392 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 0.003305456496690057 -0.024066 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16070( 3) - 06-Apr-2020 17:53:43 - [ 4] Visit: 01 (WDJ0347 @ 1291) Visit Requirements: On Hold Comments: Additional Comments: Only two FP-POS settings allowed for the 1291A central wavelength. 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 WDJ034736.6 COS/NUV ACQ/IMA PSA MIRRORB 1 7 S (7 S) 9+162409.73 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ034736.6 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1500, FP-POS=3 1 2437 S 9+162409.73 G (2437 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WDJ034736.6 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1500, FP-POS=4 1 2790 S 9+162409.73 G (2790 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ034736.69+162409 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A .73 GE WDJ034736.69+162409 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A .73 G WDJ034736.69+162409 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A .73 G 16070( 3) - 06-Apr-2020 17:53:43 - [ 5] Visit: 02 (WDJ0347 @ 1222) 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 WDJ034736.6 COS/NUV ACQ/IMA PSA MIRRORB 1 7 S (7 S) 9+162409.73 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ034736.6 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1048, FP-POS=1 1 1158 S 9+162409.73 G (1158 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WDJ034736.6 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1159, FP-POS=2 1 1159 S 9+162409.73 G (1159 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WDJ034736.6 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1235, FP-POS=3 1 1345 S 9+162409.73 G (1345 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WDJ034736.6 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1340, FP-POS=4 1 1340 S 9+162409.73 G (1340 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ034736.69+162409 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A .73 GE WDJ034736.69+162409 2 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A .73 G WDJ034736.69+162409 3 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A .73 G WDJ034736.69+162409 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A .73 G WDJ034736.69+162409 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A .73 G 16070( 3) - 06-Apr-2020 17:53:43 - [ 6] Visit: 03 (WDJ0450 @ 1291) Visit Requirements: On Hold Comments: Additional Comments: Only two FP-POS settings allowed for the 1291A central wavelength. 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 WDJ045030.9 COS/NUV ACQ/IMA PSA MIRRORB 1 14 S (14 1-284602.29 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ045030.9 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2432, FP-POS=3 1 2432 S 1-284602.29 G (2432 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WDJ045030.9 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1500, FP-POS=4 1 2799 S 1-284602.29 G (2799 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ045030.91-284602 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A .29 GE WDJ045030.91-284602 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A .29 G WDJ045030.91-284602 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A .29 G 16070( 3) - 06-Apr-2020 17:53:43 - [ 7] Visit: 04 (WDJ0450 @ 1222) 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 WDJ045030.9 COS/NUV ACQ/IMA PSA MIRRORB 1 14 S (14 1-284602.29 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ045030.9 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1790, FP-POS=1 1 1900 S 1-284602.29 G (1900 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WDJ045030.9 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=412, FP-POS=2 1 412 S (412 1-284602.29 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WDJ045030.9 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1390, FP-POS=2 1 1500 S 1-284602.29 G (1500 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WDJ045030.9 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1194, FP-POS=3 1 1194 S 1-284602.29 G (1194 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WDJ045030.9 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=674, FP-POS=3 1 784 S (784 1-284602.29 G S) ------------------------------------------------------------------------------------------------------------------------------------ 7 WDJ045030.9 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1340, FP-POS=4 1 1900 S 1-284602.29 G (1900 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ045030.91-284602 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A .29 GE WDJ045030.91-284602 2 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A .29 G WDJ045030.91-284602 3 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A .29 G WDJ045030.91-284602 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A .29 G WDJ045030.91-284602 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A .29 G WDJ045030.91-284602 6 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 N/A .29 G WDJ045030.91-284602 7 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 N/A .29 G 16070( 3) - 06-Apr-2020 17:53:43 - [ 8] Visit: 05 (WDJ1930 @ 1291) Visit Requirements: On Hold Comments: Additional Comments: Only two FP-POS settings allowed for the 1291A central wavelength. 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 WDJ193036.0 COS/NUV ACQ/IMA PSA MIRRORB 1 5 S (5 S) 5-112948.72 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ193036.0 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1055, FP-POS=3 1 1165 S 5-112948.72 G (1165 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WDJ193036.0 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1164, FP-POS=4 1 1164 S 5-112948.72 G (1164 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ193036.05-112948 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A .72 GE WDJ193036.05-112948 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A .72 G WDJ193036.05-112948 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A .72 G 16070( 3) - 06-Apr-2020 17:53:43 - [ 9] Visit: 06 (WDJ1930 @ 1222) 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 WDJ193036.0 COS/NUV ACQ/IMA PSA MIRRORB 1 5 S (5 S) 5-112948.72 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ193036.0 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1047, FP-POS=1 1 1157 S 5-112948.72 G (1157 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WDJ193036.0 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1157, FP-POS=2 1 1157 S 5-112948.72 G (1157 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WDJ193036.0 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1229, FP-POS=3 1 1339 S 5-112948.72 G (1339 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WDJ193036.0 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=1339, FP-POS=4 1 1339 S 5-112948.72 G (1339 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ193036.05-112948 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A .72 GE WDJ193036.05-112948 2 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A .72 G WDJ193036.05-112948 3 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A .72 G WDJ193036.05-112948 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A .72 G WDJ193036.05-112948 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A .72 G 16070( 3) - 06-Apr-2020 17:53:43 - [ 10] Summary Form for Proposal 16070 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1047, BUFFER-TIME=1048, BUFFER-TIME=1055, BUFFER-TIME=1157, BUFFER-TIME=1159, BUFFER-TIME=1164, BUFFER-TIME=1194, BUFFER-TIME=1229, BUFFER-TIME=1235, BUFFER-TIME=1339, BUFFER-TIME=1340, BUFFER-TIME=1390, BUFFER-TIME=1500, BUFFER-TIME=1790, BUFFER-TIME=2432, BUFFER-TIME=412, BUFFER-TIME=674, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names WDJ034736.69+162409.73, WDJ045030.91-284602.29, WDJ193036.05-112948.72 ------------------------------------------------------------------------------------------------------------------------------------