Bulk abundances of the planetary material in a nearby bright gaseous disk around a white

0 Assigned ID: 4488 ----- Attempting Submission 1 (Wed May 24 18:31:21 GMT 2023) ----- Hi Amber & Nick, I deleted the spurious Visit Orientation Requirement in Visit 01. Cheers, Boris 485515310 ----- Attempting Submission 1 (Mon Aug 28 15:46:56 GMT 2023) ----- ----- Attempting Submission 2 (Wed Oct 25 14:56:29 GMT 2023) ----- The FP-POS inefficiency warning can be ignored as the switch 4 -> 1 occurs during Earth occultation. Bulk abundances of the planetary material in a nearby bright gaseous disk around a white The remnants of planetary systems that survived the metamorphosis of their host stars into white dwarfs are identified in the form of compact debris disks, formed from the tidal disruption of planetesimals. These disks are detectable as IR flux excess, and, in rare occasions, as metallic emission lines from a gaseous disk component in optical spectra. These gaseous disks are thought to host embedded solid fragments, maybe the core, of the disrupted planetesimal, and represent ideal targets for joint ultraviolet, optical and infrared observations that provide unrivalled insight into the formation of these disks, the nature of the disrupting planetesimal, the elemental abundances of the planetary debris, and its mineralogical make-up. Here, we propose COS far-ultraviolet spectroscopy of a new, bright, and nearby gaseous disk system to measure the elemental abundances of the planetary material. The far-ultraviolet wavelength range is critically important to access transitions of core (Cr, Fe, Ni), mantle (Si, Mg, O), and crust (Ca, Al), as well as volatiles (C, S, P) species that have no transitions at optical wavelengths, or are contaminated by the disk emission lines. This system is also a prime target for JWST MIRI spectroscopy of the circumstellar dust, and these COS observations will ensure that the composition of the debris is known well in time for the next JWST proposal round. The goal of these COS observations is to obtain COS/G130M FUV spectroscopy of the hydrogen-atmosphere DA white dwarf WDJ062500.08+413410.73, which has an effective temperature of ~17500K. The observations are split across two G130M central wavelength settings, 1291A and 1222A, which are obtained over two 5-orbit visits. Visit 1 will obtain the 1291A data, which can only make use of the FP-POS=3 & 4 setups (as per COS 2025 policy), the exposure time is split equally across these two settings. Visit 2 (1222A) uses FP-POS=1,2,3,4, again, the time is split equally across the four settings. A warning regarding inefficient FP-POS changes can be ignored, as the change from FP-POS=4 back to 1 occurs during Earth occlutation between orbit 4 and 5. Apart from impacting the schedulability of this program, we do not foresee any negative effect should HST drop to a 2-gyro mode. The ETC similations were carried out with a DA model for Teff=17500K, log g=7.7, as per https://ui.adsabs.harvard.edu/abs/2021MNRAS.508.3877G Update 2023-10-25: deleted a spurious "Visit Orientation Requirement" in Visit 01. Gaensicke has been PI of 20 HST programs, carrying out far-ultraviolet spectroscopy of white dwarfs, including large, medium, small GO programs and several snapshot programs. He has in-depth experience in the analysis and interpretation of the observations of accreting white dwarfs, both in binary systems, and evolved planetary systems. He will implement the observations, and lead the analysis. Toloza is an expert in the analysis of COS time-tag observations. She will carry out the data reduction and the computation of white dwarf model atmospheres using the code of Detlev Koester. Inight is leading the development of a spectroscopic white dwarf data base for the observations from SDSS-V, from which WDJ0625+4134 was identified. Schreiber is leading the dynamical modelling of the evolution of the system. Hermes is an expert in the analysis of analyzing time-tagged COS data. Brown and Tovmassian lead the optical studies of the emission lines from the disk. Exoplanets and Exoplanet Formation 6 false false true false false false false false SUPPORTED STAR DA NO Teff~17500K J2000 J2000 GALEX FUV=17.3 COS/FUV Spectroscopic No No G130M 1222 COS/FUV Spectroscopic No No G130M 1291 1718896356144 The scheduling data was generated by CASM 31.1. CASM was run in Phase II mode. /private/var/folders/q9/0jb3sqc10kx2dw3wnl21b_dw000702/T/OPVisit10367472401846583650.xml Only two FP-POS settings allowed for the 1291A central wavelength. (Tic-Visit :proposal-id 17422 :visit-id "01" :proposal-version -1 :trans-version "20240604" :date "20-Jun-2024 11:12:36.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 1000304 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17422 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17422 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 57 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17422 :visit-id "01" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 86 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17422 :visit-id "01" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2660 :al-overhead-at-end 0 :internal-dur-at-end 48 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17422 :visit-id "01" :orbit-number 4 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 86 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17422 :visit-id "01" :orbit-number 5 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 398 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) true 5 0 For an alternative ETC simulation using a model spectrum, see https://etc.stsci.edu/etc/results/COS.ta.1888313/ 1718896359157 The scheduling data was generated by CASM 31.1. CASM was run in Phase II mode. /private/var/folders/q9/0jb3sqc10kx2dw3wnl21b_dw000702/T/OPVisit1002972633114281211.xml (Tic-Visit :proposal-id 17422 :visit-id "02" :proposal-version -1 :trans-version "20240604" :date "20-Jun-2024 11:12:39.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 1008976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17422 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17422 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 114 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17422 :visit-id "02" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 48 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17422 :visit-id "02" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 114 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17422 :visit-id "02" :orbit-number 4 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 114 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17422 :visit-id "02" :orbit-number 5 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 436 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) true 5 0 For an alternative ETC simulation using a model spectrum, see https://etc.stsci.edu/etc/results/COS.ta.1888313/