A Comprehensive UV Study of the White Dwarf with A Disintegrating Asteroid

0 Assigned ID: 331 ----- Attempting Submission 1 (Fri Apr 05 04:21:18 GMT 2019) ----- HST Phase I Proposal 331 (APT_Cycle27.apt) successfully submitted. Receipt: # 331-1 ----- Attempting Submission 2 (Fri Apr 05 21:56:10 GMT 2019) ----- HST Phase I Proposal 331 (APT_Cycle27.apt) successfully submitted. Receipt: # 331-2 0 ----- Attempting Submission 1 (Thu Jul 25 02:47:56 GMT 2019) ----- HST Phase II Proposal 15854 (PhaseII_APT_Cycle27_15854.apt) successfully submitted. Receipt: # 15854-1 ----- Attempting Submission 2 (Fri Jul 26 09:00:39 GMT 2019) ----- ----- Attempting Submission 3 (Wed Oct 02 23:18:06 GMT 2019) ----- REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE REFERENCE-FRAME MUST BE ICRS OR GSC1 FOR SMALL APERTURE 0 A Comprehensive UV Study of the White Dwarf with A Disintegrating Asteroid 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. 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. Our team is experienced in analyzing white dwarf spectra and we are heavily involved in studying WD 1145+017. Dr. J. Debes is the STIS Team lead and an expert on all aspects of STIS. Dr. P. Dufour produces state of the art white dwarf model atmosphere calculations. Dr. S. Xu is experienced with COS observation, data analysis, and has led several studies on WD 1145+017. M. Fortin-Archambault and A. Steele are graduate students and they work on modeling of the circumstellar gas around WD 1145+017. Planets and Planet Formation Stellar Physics 6 false false true false false false false SUPPORTED EXT-STAR DB NO J2000 J2000 COS/NUV Spectroscopic No No G185M 1913 COS/NUV Spectroscopic No No G185M 1941 COS/NUV Spectroscopic No No G185M 1971 COS/NUV Spectroscopic No No G225M 2186 COS/NUV Spectroscopic No No G225M 2217 COS/NUV Spectroscopic No No G225M 2250 STIS/NUV-MAMA Spectroscopic No No E230M 2707 1570058201251 /private/var/folders/wx/5z6qqdns7hj2n6r0th2jv6t000034c/T/OPVisit3533633604469074947.xml The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. 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