13322( 2) - 19-Jun-2013 10:53:43 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13322 Version: 2 Check-in Time: 19-Jun-2013 10:53:43 STScI Edit Number: 0 Title Time-resolved FUV Spectroscopy of a Unique White Dwarf in the Kepler Field ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Donald W. Hoard Eureka Scientific Inc. Y CoI: Dr. Steve B. Howell NASA Ames Research Center N ------------------------------------------------------------------------------------ Abstract We propose to use 4 HST orbits to obtain time-resolved far-UV (FUV) spectra with COS of the rapidly spinning, metal-polluted white dwarf KIC 9535405, in order to explore the distribution of accreted metals over the white dwarf's surface (including the possibility that confinement by the white dwarf's magnetic field is preventing the rapid gravitational settling of heavy elements). This will enable us to explore details of the largely unknown process through which matter transitions from circumstellar space onto the WD itself. We will also obtain the chemical composition of the parent body of the accreted matter, thereby adding to the limited pool of information on direct measurements of the composition and structure of extrasolar planetary (terrestrial) bodies. The proposed HST observations will be complemented by existing, ongoing, and planned ground- and space-based (Kepler, Spitzer) observations obtained by us. ------------------------------------------------------------------------------------ Observations Description ------------------------ The basic observing strategy for this program is relatively straightforward: 1 visit to 1 target lasting 4 orbits. A single COS/FUV configuration (G160M, center at 1309 A, TIME-TAG mode) is used for the entire duration of the visit. Each orbit is configured as a single exposure on the target with the maximum possible total integration time (target visibility minus overheads). Because we want to compare the spectra obtained during each orbit for time variable behavior of the target (not just examine a single spectrum obtained during the entire 4-orbit program), while also ensuring the best possible spectral extraction, we have used FS-POS=ALL for the science exposure in each orbit, to ensure the best results on an orbit-by-orbit basis. Thus, each orbit contains a single science exposure split into 4 sub-exposures. Orbit 1 starts with GS acquisition, followed by target acquisition (COS/FUV ACQ PEAKXD, then COS/FUV ACQ PEAKD). After accounting for the FP-POS overheads, the total remaining science time in Orbit 1 is 2222 s. The S/N achieved in the combined spectrum from Orbit 1 will be approx. 21 (using the online ETC, with the target represented by a 34, 000 K blackbody normalized to V=17.15 mag). Orbits 2, 3, and 4 are identical to each other. Like Orbit 1, they start with guide star (re)acquisition, but do not require target (re)acqusition - hence, slightly more time is available for the science exposures. After acounting for FS-POS overheads, a total of 2649 s is available for science exposure in each orbit. Expected S/N for the total combined spectrum in each of Orbits 2, 3, and 4 is approx. 23. 13322( 2) - 19-Jun-2013 10:53:43 - [ 2] Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13322( 2) - 19-Jun-2013 10:53:43 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 KIC9535405 STAR, DA RA=19H41M31.3580S +/- 0.06", J2000 V = 17.150 +/- 0.022 UVW2 (Swift UVOT) DEC=+46D06'11.37" +/- 0.06" = 1.60(3) mJy Reference Frame: ICRS Comments: Target coordinates from Spitzer IRAC ch1 pbcd mosaic obtained in Jan 2013. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2013.060 0.0019229971148430967 0.040 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 13322( 2) - 19-Jun-2013 10:53:43 - [ 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 KIC9535405 COS/FUV ACQ/PEA PSA G130M 1309 SEGMENT=BOTH 1 1.8 S (1.8 KXD S) Comments: ETC calculation uses 34000 K BB model normalized to V=17.15, gives ACQ exp time = 1.7849 sec. Double-check: the Swift measurement of the target at 0.2 microns (1.6 mJy) corresponds to 3e-14 erg/s/cm^2/A at 0.13 microns, assuming 34000 K BB spectrum. Figure 8.4 in COS IHB gives ACQ exp time of ~1.5 sec. ------------------------------------------------------------------------------------------------------------------------------------ 2 KIC9535405 COS/FUV ACQ/PEA PSA G130M 1309 NUM-POS=5, STEP-SIZE=0.9, 1 1.8 S (1.8 KD CENTER=FLUX-WT-FLR, S) SEGMENT=BOTH Comments: optional parameters are recommended values from COS IHB, Sec 8.6. ------------------------------------------------------------------------------------------------------------------------------------ 3 KIC9535405 COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=1193, 1 556 S G SEGMENT=BOTH, EXTENDED=NO, see below FLASH=YES, FP-POS=ALL (2222 S) Comments: S/N = 10.4 per resolution element in each FP-POS split spectrum ------------------------------------------------------------------------------------------------------------------------------------ 4 KIC9535405 COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=1193, 1 662 S G SEGMENT=BOTH, EXTENDED=NO, see below FLASH=YES, FP-POS=ALL (2649 S) Comments: S/N = 11.3 per resolution element in each FP-POS split spectrum ------------------------------------------------------------------------------------------------------------------------------------ 5 KIC9535405 COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=1193, 1 662 S G SEGMENT=BOTH, EXTENDED=NO, see below FLASH=YES, FP-POS=ALL (2649 S) Comments: S/N = 11.3 per resolution element in each FP-POS split spectrum ------------------------------------------------------------------------------------------------------------------------------------ 6 KIC9535405 COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=1193, 1 662 S G SEGMENT=BOTH, EXTENDED=NO, see below FLASH=YES, FP-POS=ALL (2649 S) Comments: S/N = 11.3 per resolution element in each FP-POS split spectrum ------------------------------------------------------------------------------------------------------------------------------------ 13322( 2) - 19-Jun-2013 10:53:43 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ KIC9535405 1 COS/FUV ACQ/PEA PSA G130M 1309 none none none none 1 N/A KXD KIC9535405 2 COS/FUV ACQ/PEA PSA G130M 1309 none none none none 1 N/A KD KIC9535405 3 COS/FUV TIME-TA PSA G130M 1309 none none none 1 1 555.0 S G KIC9535405 3 COS/FUV TIME-TA PSA G130M 1309 none none none 2 1 555.0 S G KIC9535405 3 COS/FUV TIME-TA PSA G130M 1309 none none none 3 1 N/A G KIC9535405 3 COS/FUV TIME-TA PSA G130M 1309 none none none 4 1 N/A G KIC9535405 4 COS/FUV TIME-TA PSA G130M 1309 none none none 1 2 663.0 S G KIC9535405 4 COS/FUV TIME-TA PSA G130M 1309 none none none 2 2 N/A G KIC9535405 4 COS/FUV TIME-TA PSA G130M 1309 none none none 3 2 N/A G KIC9535405 4 COS/FUV TIME-TA PSA G130M 1309 none none none 4 2 N/A G KIC9535405 5 COS/FUV TIME-TA PSA G130M 1309 none none none 1 3 663.0 S G KIC9535405 5 COS/FUV TIME-TA PSA G130M 1309 none none none 2 3 N/A G KIC9535405 5 COS/FUV TIME-TA PSA G130M 1309 none none none 3 3 N/A G KIC9535405 5 COS/FUV TIME-TA PSA G130M 1309 none none none 4 3 N/A G KIC9535405 6 COS/FUV TIME-TA PSA G130M 1309 none none none 1 4 663.0 S G KIC9535405 6 COS/FUV TIME-TA PSA G130M 1309 none none none 2 4 N/A G KIC9535405 6 COS/FUV TIME-TA PSA G130M 1309 none none none 3 4 N/A G KIC9535405 6 COS/FUV TIME-TA PSA G130M 1309 none none none 4 4 N/A G 13322( 2) - 19-Jun-2013 10:53:43 - [ 6] Summary Form for Proposal 13322 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAKD, ACQ/PEAKXD, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1193, CENTER=FLUX-WT-FLR, EXTENDED=NO, FLASH=YES, FP-POS=ALL, NUM-POS=5, SEGMENT=BOTH, STEP-SIZE=0.9 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M ------------------------------------------------------------------------------------------------------------------------------------ Target Names KIC9535405 ------------------------------------------------------------------------------------------------------------------------------------