0 Assigned ID: 369 ----- Attempting Submission 1 (Fri Apr 10 05:50:30 GMT 2015) ----- HST Phase I Proposal 369 (Hot_APT.apt) successfully submitted. Receipt: # 369-3 ----- Attempting Submission 4 (Fri Apr 10 19:42:32 GMT 2015) ----- 0 ----- Attempting Submission 1 (Mon Jul 20 12:45:25 GMT 2015) ----- We recently discovered the youngest white dwarf with 2-8 micron emission. Its SED can be fit by either a dust disk or a substellar companion. Two unique properties of this object favor the substellar companion hypothesis: (i) the color of the infrared excess; (ii) the non-detection of heavy elements with Keck/HIRES observations. We propose to use COS to look for heavy elements; which would be about two orders of magnitude more sensitive than the HIRES studies. If heavy elements are detected, the excess emission is likely to come from dust and this would be the hottest white dwarf with a ~1200 K dust disk; otherwise, the excess is likely to come from a substellar companion, possibly a rejuvenated planet, which would rank among the closest and lowest mass companions known to orbit a white dwarf. Our goal is to look for heavy elements in the atmosphere of PG 0010+280 to understand the origin of its infrared excess. The strongest photospheric line comes from silicon, including Si II 1265 A, Si III 1299 A and Si IV 1392 A. We will employ the G130M grating with a central wavelength of 1291 A and a wavelength coverage of 1137-1274 A and 1292-1432 A.Extrapolating from the GALEX flux, we found that an average S/N of 45 can be reached with an exposure time of 2200 sec (1 orbit) according to the ETC. To minimize the fixed-pattern noise, all four FP-POS steps are used. EXTRA-SOLAR PLANETS 12 false false false false SUPPORTED STAR DA NO J2000 J2000 COS/FUV Spectroscopic No No G130M 1291 1437396311995 /private/var/folders/47/kg05ywmx0dj2q6mwp_9dg3j00000gq/T/OPVisit5424120732364709385.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14117 :visit-id "01" :proposal-version -1 :trans-version "20150609" :date "20-Jul-2015 14:45:11.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 426320 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14117 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14117 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2894 :al-overhead-at-end 0 :internal-dur-at-end 350 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) true 1 0