13752( 3) - 04-Nov-2014 13:55:20 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13752 Version: 3 Check-in Time: 04-Nov-2014 13:55:20 STScI Edit Number: 0 Title An autopsy of dead planetary systems with COS ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. John Henry Debes Space Telescope Science Institute Y CoI: Dr. Donald W. Hoard Eureka Scientific Inc. Y CoI: Dr. Dean C. Hines Space Telescope Science Institute Y CoI: Dr. Patrick Dufour Universite de Montreal Y CoI: Dr. Joleen Carlberg Carnegie Institution of Washington Y CoI: Prof. Boris T. Gaensicke The University of Warwick Y ------------------------------------------------------------------------------------ Abstract We propose to use HST/COS to conduct autopsies of dead planetary systems around UV bright hydrogen-white dwarfs (WDs), which have dust disks found via their mid-IR emission in excess of that expected from the photosphere. As part of a WISE survey, and followed up with a combination of NASA Keck HIRES/Magellan MIKE optical spectroscopy, we have identified three new systems that are accreting dust. These WDs are bright in the mid-IR and UV, gold-standard targets for studies with HST/COS and later with JWST. The dusty material is debris resulting from the tidal disruption of exo-asteroids that accrete onto the WD surface. Many atomic elements from the accreted and dissociated dust particles are detectable with COS, enabling abundance determinations of exo-asteroidal material. Moreover, the photospheric abundances of this material can be directly compared with a determination of the dust mineralogy obtained with future JWST mid-IR spectroscopy-our proposed UV observations provide complementary constraints on mineralogical compositions of the accreting dust particles. UV spectroscopy is crucial for cataloging elemental abundances for these exo-asteroids. For the majority of WDs, optical spectroscopy reveals only a couple of lines of Ca or Mg, while UV spectroscopy captures lines from Al, Fe, Si, C, Ni, O, S, Cr, P, and Ti. Obtaining the elemental abundances of exo-asteroids is comparable to the spectroscopic characterization of transiting exoplanets or protoplanetary disks-all of these techniques determine how the chemical diversity of planetary systems translate into planetary architectures and the probability of habitable planets around solar-type stars. ------------------------------------------------------------------------------------ Observations Description ------------------------ We wish to acquire each object with an ACQ/IMAGE exposure, then followed by FP-POS=ALL observing at G130M/1291 within one orbit. Target S/N of at least 30 within an orbit. ------------------------------------------------------------------------------------ 13752( 3) - 04-Nov-2014 13:55:20 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 KPD-0420+520 STAR, DA RA=04H24M15.7280S +/- 0.125", J2000 V = 15.02 3 DEC=+52D10'10.59" +/- 0.125" Reference Frame: ICRS Comments: PM from UCAC4, position from 2MASS, uncertainty on proper motion is ~0.06" from the epoch (1-sigma) Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1999.87 -0.0050435377992395945 -0.006 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-0420-731 STAR, DA RA=04H19M37.7172S +/- 0.125", J2000 V = 15.44 FUV=14.94 DEC=-73D03'44.18" +/- 0.125" Reference Frame: ICRS Comments: PM from UCAC4, position from 2MASS, PM uncertainty ~0.06" from epoch. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1998.925 0.007597284410863092 0.020399999999999998 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-2329+407 STAR, DA RA=23H31M35.6500S +/- 0.125", J2000 V = 13.82 FUV=13.93 DEC=+41D01'30.75" +/- 0.125" Reference Frame: ICRS Comments: coordinates taken from 2MASS, proper motion from UCAC4. uncertainty in proper motion may place star up to ~0.1" away from expected position (1-sigma), still within 0.4" error budget Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1999.79 0.023594257394130673 -0.108 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 13752( 3) - 04-Nov-2014 13:55:20 - [ 3] Visit: 01 Visit Requirements: SCHED 80% On Hold Comments: Additional Comments: GALEX FUV=14.95, NUV=15.154--will achieve S/N=25 @ longer wavelengths 4 FP-POS after ACQ/IMAGE with MIRRORB/PSA 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 WD-0420-731 COS/NUV ACQ/IMA PSA MIRRORB 1 7.2 S (7.2 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-0420-731 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1280, FP-POS=ALL 1 536 S G (2144 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-0420-731 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE WD-0420-731 2 COS/FUV TIME-TA PSA G130M 1291 none none none 1 1 N/A G WD-0420-731 2 COS/FUV TIME-TA PSA G130M 1291 none none none 2 1 N/A G WD-0420-731 2 COS/FUV TIME-TA PSA G130M 1291 none none none 3 1 N/A G WD-0420-731 2 COS/FUV TIME-TA PSA G130M 1291 none none none 4 1 N/A G 13752( 3) - 04-Nov-2014 13:55:20 - [ 4] Visit: 02 Visit Requirements: SCHED 80% On Hold Comments: Additional Comments: GALEX FUV=13.64, brightest target. Exposure time selected to match 2x recommended buffer time. Can be shortened to enhance scheduling flexibility. 4 FP-POS after ACQ/IMAGE with MIRRORA/BOA 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 KPD-0420+52 COS/NUV ACQ/IMA BOA MIRRORA 1 90 S (90 03 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 KPD-0420+52 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=214, FP-POS=ALL 1 428 S 03 G (1712 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 | ------------------------------------------------------------------------------------------------------------------------------------ KPD-0420+5203 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE KPD-0420+5203 2 COS/FUV TIME-TA PSA G130M 1291 none none none 1 1 N/A G KPD-0420+5203 2 COS/FUV TIME-TA PSA G130M 1291 none none none 2 1 N/A G KPD-0420+5203 2 COS/FUV TIME-TA PSA G130M 1291 none none none 3 1 N/A G KPD-0420+5203 2 COS/FUV TIME-TA PSA G130M 1291 none none none 4 1 N/A G 13752( 3) - 04-Nov-2014 13:55:20 - [ 5] Visit: 03 Visit Requirements: SCHED 80% On Hold Comments: Additional Comments: GALEX FUV=13.93, exposure time chosen to fill standard orbit. Can be shortened to accomodate additional scheduling flexibility. 4 FP-POS after ACQ/IMAGE with MIRRORA/BOA 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 WD-2329+407 COS/NUV ACQ/IMA BOA MIRRORA 1 32 S (32 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-2329+407 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=390, FP-POS=ALL 1 500 S G (2000 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-2329+407 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE WD-2329+407 2 COS/FUV TIME-TA PSA G130M 1291 none none none 1 1 N/A G WD-2329+407 2 COS/FUV TIME-TA PSA G130M 1291 none none none 2 1 N/A G WD-2329+407 2 COS/FUV TIME-TA PSA G130M 1291 none none none 3 1 N/A G WD-2329+407 2 COS/FUV TIME-TA PSA G130M 1291 none none none 4 1 N/A G 13752( 3) - 04-Nov-2014 13:55:20 - [ 6] Summary Form for Proposal 13752 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures BOA, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1280, BUFFER-TIME=214, BUFFER-TIME=390, FP-POS=ALL ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SCHED 80% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, MIRRORA, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names KPD-0420+5203, WD-0420-731, WD-2329+407 ------------------------------------------------------------------------------------------------------------------------------------