16204( 2) - 25-Jun-2020 14:39:48 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16204 Version: 2 Check-in Time: 25-Jun-2020 14:39:48 STScI Edit Number: 0 Title A New Method to Measure the Chemical Compositions of Extrasolar Planetesimals ------------------------------------------------------------------------------------ Type Cycle GO 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Siyi Xu Gemini Observatory, Northern Operations Y CoI: Dr. Erik Dennihy Gemini Observatory, Southern Operations Y CoI: Alexandra Doyle University of California - Los Angeles N CoI: Dr. Patrick Dufour Universite de Montreal N CoI: Dr. Ning Jiang University of Science & Technology of N China CoI: Dr. Beth Klein University of California - Los Angeles N CoI: Dr. Carl Melis University of California - San Diego N CoI: Dr. Tinggui Wang University of Science & Technology of N China CoI: Dr. Sherry Yeh California Association for Research in N Astronomy (CARA) CoI: Prof. Ben M. Zuckerman University of California - Los Angeles N ------------------------------------------------------------------------------------ Abstract The chemical composition of an extrasolar planet is a fundamental property with little observational signature. Spectroscopic observations of polluted white dwarfs have proven to be a successful pathway to constrain the compositions of disrupted planetesimals but this approach has its own limitations. Here, we propose a new method to measure the compositions of extrasolar planetesimals by observing the gas debris around polluted white dwarfs. These disks are fresh extrasolar planetary material in a transient stage, right after tidal disruption and before being completely accreted onto the white dwarf. Recent increases in the sample size of white dwarf gas disks combined with timely advancements in disk modeling efforts have made this new exploration feasible. This proposal will open a noval method to measure chemical compositions of extrasolar planetesimals. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal of this proposal is to determine the magnesium abundances in gas disks around white dwarfs -- a novel way to measure the compositions of extrasolar planetesimals. The strongest magnesium transitions are those around Mg II 2800 A. We propose to use G230L grating (spectral resolution 2000) with a central wavelength of 2950 A, which covers 1651 - 2049 A and 2751 - 3150 A. Such a wide wavelength coverage will allow us to search for other unknown gas emission lines as well. For the four systems with strong calcium triplet emissions, a SNR of at least 30 is needed to distinguish different Mg abundances, while for four systems with weaker calcium triplet emission, a SNR of at least 50 is needed. The requested time is computed with the exposure time calculator v28.1. Including 16204( 2) - 25-Jun-2020 14:39:48 - [ 2] overhead for target acquisition, a total of 16 orbits is needed for this program. Our targets are sufficiently faint that the safety of COS is not a concern. The reduced gyro operations have little impact on the execution of this program. ------------------------------------------------------------------------------------ 16204( 2) - 25-Jun-2020 14:39:48 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GAIAJ0006+28 STAR, DA RA=00H06M34.7400S +/- 0.08", J2000 V = 16.4 58 DEC=+28D58'46.75" +/- 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 0.00176758244697522 0.013295 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD0145+234 STAR, DA RA=01H47M54.8118S +/- 0.058", J2000 V = 14.0 DEC=+23D39'42.09" +/- 0.039" 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 -3.7914058594532766E-4 -0.097589 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 3 GAIAJ0347+16 STAR, DA RA=03H47M36.6980S +/- 0.09", J2000 V = 16.7 24 DEC=+16D24'8.76" +/- 0.05" 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 ------------------------------------------------------------------------------------------------------------------------------------ 4 GAIAJ0510+23 STAR, DA RA=05H10M2.0970S +/- 0.06", J2000 V = 15.1 15 DEC=+23D15'40.82" +/- 0.05" 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 -0.0032200115105649424 -0.038229 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 5 GAIAJ0611-69 STAR, DA RA=06H11M31.7660S +/- 0.05", J2000 V = 16.8 31 DEC=-69D31'0.59" +/- 0.07" 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 0.004317407525365082 0.100373 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD0842+572 STAR, DA RA=08H46M2.4320S +/- 0.06", J2000 V = 16.8 DEC=+57D03'28.26" +/- 0.04" 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 -0.002684237235939244 -0.02416 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 7 WD1622+587 STAR, DB RA=16H22M59.7310S +/- 0.06", J2000 V = 16.9 DEC=+58D40'28.90" +/- 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 0.005541359929665551 -0.128692 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16204( 2) - 25-Jun-2020 14:39:48 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 8 GAIAJ2100+21 STAR, DA RA=21H00M34.7300S +/- 0.06", J2000 V = 15.2 22 DEC=+21D22'57.48" +/- 0.05" 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 0.005278326368170501 0.038423 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16204( 2) - 25-Jun-2020 14:39:48 - [ 5] Visit: 01 (GaiaJ0006+2858 - Visit) 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 GAIAJ0006+2 COS/NUV ACQ/IMA PSA MIRRORB 1 3.7 S (3.7 858 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GAIAJ0006+2 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=1028, FP-POS=ALL 1 1130 S 858 G see below (5092 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 | ------------------------------------------------------------------------------------------------------------------------------------ GAIAJ0006+2858 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE GAIAJ0006+2858 2 COS/NUV TIME-TA PSA G230L 2950 none none none 1 1 1217.0 S G GAIAJ0006+2858 2 COS/NUV TIME-TA PSA G230L 2950 none none none 2 1 1217.0 S G GAIAJ0006+2858 2 COS/NUV TIME-TA PSA G230L 2950 none none none 3 2 1329.0 S G GAIAJ0006+2858 2 COS/NUV TIME-TA PSA G230L 2950 none none none 4 2 1329.0 S G 16204( 2) - 25-Jun-2020 14:39:48 - [ 6] Visit: 02 (WD0145+234 - Visit) 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 WD0145+234 COS/NUV ACQ/IMA BOA MIRRORA 1 23.2 S GE (23.2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD0145+234 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=650, FP-POS=ALL 1 540 S G see below (2044 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD0145+234 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE WD0145+234 2 COS/NUV TIME-TA PSA G230L 2950 none none none 1 1 511.0 S G WD0145+234 2 COS/NUV TIME-TA PSA G230L 2950 none none none 2 1 511.0 S G WD0145+234 2 COS/NUV TIME-TA PSA G230L 2950 none none none 3 1 511.0 S G WD0145+234 2 COS/NUV TIME-TA PSA G230L 2950 none none none 4 1 511.0 S G 16204( 2) - 25-Jun-2020 14:39:48 - [ 7] Visit: 03 (GAIAJ0347+1624 - Visit) 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 GAIAJ0347+1 COS/NUV ACQ/IMA PSA MIRRORB 1 6.5 S (6.5 624 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GAIAJ0347+1 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=1145, FP-POS=ALL 1 1130 S 624 G see below (5000 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 | ------------------------------------------------------------------------------------------------------------------------------------ GAIAJ0347+1624 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE GAIAJ0347+1624 2 COS/NUV TIME-TA PSA G230L 2950 none none none 1 1 1171.0 S G GAIAJ0347+1624 2 COS/NUV TIME-TA PSA G230L 2950 none none none 2 1 1171.0 S G GAIAJ0347+1624 2 COS/NUV TIME-TA PSA G230L 2950 none none none 3 2 1329.0 S G GAIAJ0347+1624 2 COS/NUV TIME-TA PSA G230L 2950 none none none 4 2 1329.0 S G 16204( 2) - 25-Jun-2020 14:39:48 - [ 8] Visit: 04 (GAIAJ0510+2315 - Visit) 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 GAIAJ0510+2 COS/NUV ACQ/IMA BOA MIRRORA 1 25.2 S 315 GE (25.2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GAIAJ0510+2 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=639, FP-POS=ALL 1 1130 S 315 G see below (4894 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 | ------------------------------------------------------------------------------------------------------------------------------------ GAIAJ0510+2315 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE GAIAJ0510+2315 2 COS/NUV TIME-TA PSA G230L 2950 none none none 1 1 1155.0 S G GAIAJ0510+2315 2 COS/NUV TIME-TA PSA G230L 2950 none none none 2 1 1155.0 S G GAIAJ0510+2315 2 COS/NUV TIME-TA PSA G230L 2950 none none none 3 2 1292.0 S G GAIAJ0510+2315 2 COS/NUV TIME-TA PSA G230L 2950 none none none 4 2 1292.0 S G 16204( 2) - 25-Jun-2020 14:39:48 - [ 9] Visit: 05 (GAIAJ0611-6931 - Visit) 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 GAIAJ0611-6 COS/NUV ACQ/IMA PSA MIRRORB 1 8.4 S (8.4 931 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GAIAJ0611-6 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=1184, FP-POS=ALL 1 1130 S 931 G see below (5724 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 | ------------------------------------------------------------------------------------------------------------------------------------ GAIAJ0611-6931 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE GAIAJ0611-6931 2 COS/NUV TIME-TA PSA G230L 2950 none none none 1 1 1372.0 S G GAIAJ0611-6931 2 COS/NUV TIME-TA PSA G230L 2950 none none none 2 1 1372.0 S G GAIAJ0611-6931 2 COS/NUV TIME-TA PSA G230L 2950 none none none 3 2 1490.0 S G GAIAJ0611-6931 2 COS/NUV TIME-TA PSA G230L 2950 none none none 4 2 1490.0 S G 16204( 2) - 25-Jun-2020 14:39:48 - [ 10] Visit: 06 (WD0842+572 - Visit) 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 WD0842+572 COS/NUV ACQ/IMA PSA MIRRORB 1 8.9 S (8.9 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD0842+572 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=1191, FP-POS=ALL 1 1300 S G see below (5540 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD0842+572 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE WD0842+572 2 COS/NUV TIME-TA PSA G230L 2950 none none none 1 1 1324.0 S G WD0842+572 2 COS/NUV TIME-TA PSA G230L 2950 none none none 2 1 1324.0 S G WD0842+572 2 COS/NUV TIME-TA PSA G230L 2950 none none none 3 2 1446.0 S G WD0842+572 2 COS/NUV TIME-TA PSA G230L 2950 none none none 4 2 1446.0 S G 16204( 2) - 25-Jun-2020 14:39:48 - [ 11] Visit: 07 (WD1622+587 - Visit) 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 WD1622+587 COS/NUV ACQ/IMA PSA MIRRORB 1 6 S (6 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1622+587 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=1119, FP-POS=1 1 2800 S G see below (2732 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1622+587 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=1119, FP-POS=2 1 2800 S G see below (2970 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1622+587 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=1119, FP-POS=3 1 2800 S G see below (2970 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1622+587 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE WD1622+587 2 COS/NUV TIME-TA PSA G230L 2950 none none none none 1 2732.0 S G WD1622+587 3 COS/NUV TIME-TA PSA G230L 2950 none none none none 2 2970.0 S G WD1622+587 4 COS/NUV TIME-TA PSA G230L 2950 none none none none 3 2970.0 S G 16204( 2) - 25-Jun-2020 14:39:48 - [ 12] Visit: 08 (GAIAJ2100+2122 - Visit) 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 GAIAJ2100+2 COS/NUV ACQ/IMA BOA MIRRORA 1 30 S (30 122 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GAIAJ2100+2 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=691, FP-POS=ALL 1 1400 S 122 G see below (4914 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 | ------------------------------------------------------------------------------------------------------------------------------------ GAIAJ2100+2122 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE GAIAJ2100+2122 2 COS/NUV TIME-TA PSA G230L 2950 none none none 1 1 1156.0 S G GAIAJ2100+2122 2 COS/NUV TIME-TA PSA G230L 2950 none none none 2 1 1156.0 S G GAIAJ2100+2122 2 COS/NUV TIME-TA PSA G230L 2950 none none none 3 2 1301.0 S G GAIAJ2100+2122 2 COS/NUV TIME-TA PSA G230L 2950 none none none 4 2 1301.0 S G 16204( 2) - 25-Jun-2020 14:39:48 - [ 13] Summary Form for Proposal 16204 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures BOA, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1028, BUFFER-TIME=1119, BUFFER-TIME=1145, BUFFER-TIME=1184, BUFFER-TIME=1191, BUFFER-TIME=639, BUFFER-TIME=650, BUFFER-TIME=691, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=ALL ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, MIRRORA, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names GAIAJ0006+2858, GAIAJ0347+1624, GAIAJ0510+2315, GAIAJ0611-6931, GAIAJ2100+2122, WD0145+234, WD0842+572, WD1622+587 ------------------------------------------------------------------------------------------------------------------------------------