15854( 4) - 03-Oct-2019 11:27:00 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15854 Version: 4 Check-in Time: 03-Oct-2019 11:27:00 STScI Edit Number: 0 Title A Comprehensive UV Study of the White Dwarf with A Disintegrating Asteroid ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Siyi Xu Gemini Observatory, Northern Operations Y CoI: Dr. John Henry Debes Space Telescope Science Institute N CoI: Dr. Patrick Dufour Universite de Montreal N CoI: Maude Fortin-Archambault Universite de Montreal N CoI: Amy Steele University of Maryland N ------------------------------------------------------------------------------------ Abstract WD 1145+017 is an exciting system that has a heavily polluted atmosphere, a dust disk, a gas disk, and transits from fragments of an actively disintegrating object. It is extremely active and full of surprises. Here, we propose to obtain a full UV spectrum of this system to determine the chemical compositions of the material accreted onto WD 1145+017 as well as the composition and dynamical configuration of the gas disk. WD 1145+017 is the lynchpin to independently understand the tidal disruption of an asteroid-- crucial to our understanding of other polluted white dwarfs as well as the end stage of planetary systems. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose to obtain a medium resolution NUV spectrum of WD 1145+017 that covers 1800 --- 3100 Angstrom. We consulted the COS Instrument Handbook and STIS Instrument Handbook to find the optimal configuration for the proposal. To cover 1800 ~ 2300 Angstrom, COS is the only instrument that has enough sensitivity and spectral resolution for our program. We will use G185M (spectral resolution ~ 18, 000) with a central wavelength of 1913 Angstrom, 1941 Angstrom, and 1971 Angstrom as well as G225M (spectral resolution ~ 22, 000) with a central wavelength of 2186 Angstrom, 2217 Angstrom, and 2250 Angstrom. This will provide an almost complete coverage from 1800 to 2300 Angstrom. For 2300 Angstrom to 3100 Angstrom, we will use the STIS Echelle E230M (spectral resolution ~ 30, 000) with a central wavelength of 2707 Angstrom. To compute the required observing time, we used the exposure time calculator. A signal- to-noise ratio of at least 10 per pixel is required for our analysis. We require 1 orbit for each of the COS set-up and 3 orbits in total for STIS observations. A total of 9 orbits is required for this proposal. ------------------------------------------------------------------------------------ 15854( 4) - 03-Oct-2019 11:27:00 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WD1145+0145 EXT-STAR, DB RA=11H48M33.6270S +/- 0.04", J2000 V = 17.3 DEC=+01D28'59.45" +/- 0.043" Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.002887634121500669 -0.007 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 15854( 4) - 03-Oct-2019 11:27:00 - [ 3] Visit: 01 (G185M) 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 WD1145+0145 COS/NUV ACQ/IMA PSA MIRRORB 1 60 S (60 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1145+0145 COS/NUV TIME-TA PSA G185M 1913 BUFFER-TIME=1500, FP-POS=ALL 1 510 S G see below (2000 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1145+0145 COS/NUV TIME-TA PSA G185M 1941 BUFFER-TIME=1500, FP-POS=ALL 1 510 S G see below (2520 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1145+0145 COS/NUV TIME-TA PSA G185M 1971 BUFFER-TIME=1500, FP-POS=ALL 1 510 S G see below (2520 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1145+0145 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE WD1145+0145 2 COS/NUV TIME-TA PSA G185M 1913 none none none 1 1 500.0 S G WD1145+0145 2 COS/NUV TIME-TA PSA G185M 1913 none none none 2 1 500.0 S G WD1145+0145 2 COS/NUV TIME-TA PSA G185M 1913 none none none 3 1 500.0 S G WD1145+0145 2 COS/NUV TIME-TA PSA G185M 1913 none none none 4 1 500.0 S G WD1145+0145 3 COS/NUV TIME-TA PSA G185M 1941 none none none 1 2 630.0 S G WD1145+0145 3 COS/NUV TIME-TA PSA G185M 1941 none none none 2 2 630.0 S G WD1145+0145 3 COS/NUV TIME-TA PSA G185M 1941 none none none 3 2 630.0 S G WD1145+0145 3 COS/NUV TIME-TA PSA G185M 1941 none none none 4 2 630.0 S G WD1145+0145 4 COS/NUV TIME-TA PSA G185M 1971 none none none 1 3 630.0 S G 15854( 4) - 03-Oct-2019 11:27:00 - [ 4] 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1145+0145 4 COS/NUV TIME-TA PSA G185M 1971 none none none 2 3 630.0 S G WD1145+0145 4 COS/NUV TIME-TA PSA G185M 1971 none none none 3 3 630.0 S G WD1145+0145 4 COS/NUV TIME-TA PSA G185M 1971 none none none 4 3 630.0 S G 15854( 4) - 03-Oct-2019 11:27:00 - [ 5] Visit: 02 (G225M) 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 WD1145+0145 COS/NUV ACQ/IMA PSA MIRRORB 1 60 S (60 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1145+0145 COS/NUV TIME-TA PSA G225M 2186 BUFFER-TIME=1500, FP-POS=ALL 1 510 S G see below (2068 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1145+0145 COS/NUV TIME-TA PSA G225M 2217 BUFFER-TIME=1500, FP-POS=ALL 1 510 S G see below (2520 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1145+0145 COS/NUV TIME-TA PSA G225M 2250 BUFFER-TIME=1500, FP-POS=ALL 1 510 S G see below (2520 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1145+0145 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE WD1145+0145 2 COS/NUV TIME-TA PSA G225M 2186 none none none 1 1 517.0 S G WD1145+0145 2 COS/NUV TIME-TA PSA G225M 2186 none none none 2 1 517.0 S G WD1145+0145 2 COS/NUV TIME-TA PSA G225M 2186 none none none 3 1 517.0 S G WD1145+0145 2 COS/NUV TIME-TA PSA G225M 2186 none none none 4 1 517.0 S G WD1145+0145 3 COS/NUV TIME-TA PSA G225M 2217 none none none 1 2 630.0 S G WD1145+0145 3 COS/NUV TIME-TA PSA G225M 2217 none none none 2 2 630.0 S G WD1145+0145 3 COS/NUV TIME-TA PSA G225M 2217 none none none 3 2 630.0 S G WD1145+0145 3 COS/NUV TIME-TA PSA G225M 2217 none none none 4 2 630.0 S G WD1145+0145 4 COS/NUV TIME-TA PSA G225M 2250 none none none 1 3 630.0 S G 15854( 4) - 03-Oct-2019 11:27:00 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1145+0145 4 COS/NUV TIME-TA PSA G225M 2250 none none none 2 3 630.0 S G WD1145+0145 4 COS/NUV TIME-TA PSA G225M 2250 none none none 3 3 630.0 S G WD1145+0145 4 COS/NUV TIME-TA PSA G225M 2250 none none none 4 3 630.0 S G 15854( 4) - 03-Oct-2019 11:27:00 - [ 7] Visit: 03 (STIS NUV) 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 WD1145+0145 STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1145+0145 STIS/NUV TIME-TA 0.2X0.2 E230M 2707 BUFFER-TIME=700 1 2000 S -MAMA G see below (2218 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1145+0145 STIS/NUV TIME-TA 0.2X0.2 E230M 2707 BUFFER-TIME=700 1 2000 S -MAMA G see below (2810 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1145+0145 STIS/NUV TIME-TA 0.2X0.2 E230M 2707 BUFFER-TIME=700 1 2000 S -MAMA G see below (2810 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1145+0145 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A WD1145+0145 2 STIS/NUV TIME-TA 0.2X0.2 E230M 2707 none none none none 1 2218.0 S -MAMA G WD1145+0145 3 STIS/NUV TIME-TA 0.2X0.2 E230M 2707 none none none none 2 2810.0 S -MAMA G WD1145+0145 4 STIS/NUV TIME-TA 0.2X0.2 E230M 2707 none none none none 3 2810.0 S -MAMA G 15854( 4) - 03-Oct-2019 11:27:00 - [ 8] Summary Form for Proposal 15854 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.2, F28X50LP, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/NUV, STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ, ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1500, BUFFER-TIME=700, FP-POS=ALL ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements E230M, G185M, G225M, MIRROR, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names WD1145+0145 ------------------------------------------------------------------------------------------------------------------------------------