15155( 9) - 07-Dec-2018 10:53:34 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15155 Version: 9 Check-in Time: 07-Dec-2018 10:53:34 STScI Edit Number: 5 Title Actively Disintegrating Astroids around a White Dwarf ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ 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: Justin Ely Eureka Scientific Inc. N CoI: Dr. Philip Steven Muirhead Boston University N CoI: Dr. Andrew Vanderburg University of Texas at Austin N CoI: Prof. Ben M. Zuckerman University of California - Los Angeles N CoI: Prof. Saul A Rappaport Massachusetts Institute of Technology N CoI: Dr. Paul A Dalba University of California - Riverside N CoI: Amy Steele University of Maryland N CoI: Dr. Drake Deming University of Maryland N CoI: Mr. Bruce Gary Hereford Arizona Observatory N ------------------------------------------------------------------------------------ Abstract Recent studies show that planetary systems can be widespread around white dwarfs. It has been proposed that planetary systems are responsible for the pollution observed in a white dwarf's atmosphere and the excess infrared radiation. This scenario is greatly strengthened by the recent discovery of actively disintegrating bodies orbiting around the white dwarf WD 1145+017. In addition, this system has a heavily polluted atmosphere, a dust disk, and circumstellar gas. Our team has been monitoring this system since its discovery and our recent COS data have revealed many new surprises. We propose to continue studying this system for the next two cycles and further constrain the evolution of the disintegrating bodies: what are the main mechanisms responsible for its destruction? How is circumstellar gas produced and maintained? ------------------------------------------------------------------------------------ Observations Description ------------------------ We aim to understand WD 1145+017 system, which has a heavily polluted atmosphere, a dust disk, at least two circumstellar gas components as well as multiple transiting objects. COS observations can uniquely monitor the pollution, circumstellar gas, and transiting objects simultaneously. Here, we propose to obtain a full FUV spectrum of this rapidly evolving object. Specifically, our goal is threefold: (i) Understand the evolution of circumstellar gas; (ii) Study the change of UV light curve; (iii) Explore new spectral features. To have a continuous coverage from 1130 to 1800 Anstrom, we request four set-ups, two with G130M (central wavelength of 1291 Angstrom and 1327 Angstrom), and two with G160M (central wavelength of 1577 Anstrom and 1623 Angstrom). This is a time-critical proposal that requires coordinated ground-based 15155( 9) - 07-Dec-2018 10:53:34 - [ 2] observations. We prefer to keep the plan windows. ------------------------------------------------------------------------------------ 15155( 9) - 07-Dec-2018 10:53:34 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WD1145+017 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 ------------------------------------------------------------------------------------------------------------------------------------ 15155( 9) - 07-Dec-2018 10:53:34 - [ 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 WD1145+017 COS/NUV ACQ/IMA PSA MIRRORB 1 60 S (60 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1145+017 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, FLASH=YES, 1 2000 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (2439 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1145+017 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, FLASH=YES, 1 2000 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (2916 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1145+017 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, FLASH=YES, 1 2000 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (2916 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+017 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE WD1145+017 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2439.0 S G WD1145+017 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2916.0 S G WD1145+017 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 2916.0 S G 15155( 9) - 07-Dec-2018 10:53:34 - [ 5] Visit: 02 Visit Requirements: AFTER 01 BY 9.8 Orbits TO 10.2 Orbits 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+017 COS/NUV ACQ/IMA PSA MIRRORB 1 60 S (60 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1145+017 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, FLASH=YES, 1 2000 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (2439 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1145+017 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, FLASH=YES, 1 2000 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (2916 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1145+017 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, FLASH=YES, 1 2000 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (2916 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+017 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE WD1145+017 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2439.0 S G WD1145+017 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2916.0 S G WD1145+017 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 2916.0 S G 15155( 9) - 07-Dec-2018 10:53:34 - [ 6] Visit: 03 Visit Requirements: SCHED 80%; BETWEEN 23-FEB-2019:00:00:00 AND 17-MAR-2019:00:00:00; BETWEEN 23-MAR-2019:00:00:00 AND 13-APR-2019:00:00:00 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+017 COS/NUV ACQ/IMA PSA MIRRORB 1 60 S (60 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=1, FLASH=YES, 1 2100 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (1926 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=2, FLASH=YES, 1 291 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (117 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=2, FLASH=YES, 1 1620 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (1474 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=3, FLASH=YES, 1 1097 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (951 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=3, FLASH=YES, 1 787 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (670 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=4, FLASH=YES, 1 1911 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (1794 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+017 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE WD1145+017 2 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 1926.0 S G WD1145+017 3 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 117.0 S G WD1145+017 4 COS/FUV TIME-TA PSA G160M 1577 none none none none 2 1474.0 S G 15155( 9) - 07-Dec-2018 10:53:34 - [ 7] 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+017 5 COS/FUV TIME-TA PSA G160M 1577 none none none none 2 951.0 S G WD1145+017 6 COS/FUV TIME-TA PSA G160M 1577 none none none none 3 670.0 S G WD1145+017 7 COS/FUV TIME-TA PSA G160M 1577 none none none none 3 1794.0 S G 15155( 9) - 07-Dec-2018 10:53:34 - [ 8] Visit: 04 Visit Requirements: SCHED 80%; AFTER 03 BY 9.8 Orbits TO 10.2 Orbits 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+017 COS/NUV ACQ/IMA PSA MIRRORB 1 60 S (60 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=1, FLASH=YES, 1 2100 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (1926 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=2, FLASH=YES, 1 291 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (117 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=2, FLASH=YES, 1 1620 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (1474 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=3, FLASH=YES, 1 1097 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (951 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=3, FLASH=YES, 1 787 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (670 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 WD1145+017 COS/FUV TIME-TA PSA G160M 1577 FP-POS=4, FLASH=YES, 1 1911 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (1794 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+017 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE WD1145+017 2 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 1926.0 S G WD1145+017 3 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 117.0 S G WD1145+017 4 COS/FUV TIME-TA PSA G160M 1577 none none none none 2 1474.0 S G 15155( 9) - 07-Dec-2018 10:53:34 - [ 9] 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+017 5 COS/FUV TIME-TA PSA G160M 1577 none none none none 2 951.0 S G WD1145+017 6 COS/FUV TIME-TA PSA G160M 1577 none none none none 3 670.0 S G WD1145+017 7 COS/FUV TIME-TA PSA G160M 1577 none none none none 3 1794.0 S G 15155( 9) - 07-Dec-2018 10:53:34 - [ 10] Visit: 05 (repeat of visit 1&2) 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+017 COS/NUV ACQ/IMA PSA MIRRORB 1 60 S (60 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1145+017 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, FLASH=YES, 1 2000 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (2438 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1145+017 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, FLASH=YES, 1 2000 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (2916 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1145+017 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, FLASH=YES, 1 2000 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (2916 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WD1145+017 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, FLASH=YES, 1 2000 S G SEGMENT=BOTH, BUFFER-TIME=1500 see below (2916 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+017 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE WD1145+017 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2438.0 S G WD1145+017 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2916.0 S G WD1145+017 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 2916.0 S G WD1145+017 5 COS/FUV TIME-TA PSA G130M 1291 none none none none 4 2916.0 S G 15155( 9) - 07-Dec-2018 10:53:34 - [ 11] Summary Form for Proposal 15155 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1500, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 9.8 Orbits TO 10.2 Orbits, AFTER 03 BY 9.8 Orbits TO 10.2 Orbits, BETWEEN 23-FEB-2019:00:00:00 AND 17-MAR-2019:00:00:00, BETWEEN 23-MAR-2019:00:00:00 AND 13-APR-2019:00:00:00, SCHED 80% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, G160M, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names WD1145+017 ------------------------------------------------------------------------------------------------------------------------------------