11651( 4) - 21-Dec-2009 16:45:06 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11651 Version: 4 Check-in Time: 21-Dec-2009 16:45:06 STScI Edit Number: 2 Title Is the atmosphere of the hottest known transiting exoplanet evaporating? ------------------------------------------------------------------------------------ Type Cycle GO 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Carole A. Haswell Open University CoI: Dr. Peter J. Wheatley The University of Warwick N CoI: Dr. Leslie Hebb University of St. Andrews N CoI: Prof. Andrew Cameron University of St. Andrews N CoI: Dr. Cynthia Froning University of Colorado at Boulder N CoI: Mr. Andrew Carter Open University N CoI: Dr. Benoit Loeillet Laboratoire d'Astrophysique de Marseille N CoI: Dr. Christiane Helling University of St. Andrews N CoI: Dr. Luca Fossati Open University N ------------------------------------------------------------------------------------ Abstract WASP-12 is the hottest and the largest currently known transiting exoplanet. It has the shortest orbital period and is the closest to its host star. Previous spectacular HST observations revealed that the atmosphere of HD 209458b appears to be evaporating away, though this interpretation has recently been questioned. We propose ultraviolet observations of WASP-12 to learn whether it is in a state of hydrodynamic `blow-off' as the work on HD 209458b would suggest. We will obtain a precise radius for the planet, free from systematic errors caused by the earth's atmosphere. We will use our data to hone models of exoplanet atmospheres. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will take time-series spectroscopy with the COS/NUV TIMETAG mode using G285M at the 2676 setting, chosen to cover the Mg II 2800 A triplet. Using the COS ETC, we estimate that we will obtain a S/N between 11 and 7 in 120 sec (spectrum binned to 1 A). TIMETAG observing mode will allow us to flexibly bin our spectrum in wavelength and/or time to address different science questions. We require two visits, each with five orbits to fuly cover all four contact points and to cover the pre and post transit phases. The HST visibility window for WASP-12 is 54 mi. The observations need to be made at tightly specified phase intervals in order to cover the entire exoplanet transit. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments 11651( 4) - 21-Dec-2009 16:45:06 - [ 2] ------------------- ------------------------------------------------------------------------------------ 11651( 4) - 21-Dec-2009 16:45:06 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WASP-12 STAR, EXTRA-SOLAR RA=06H30M32.7900S +/- 0.1", J2000 V = 11.58 +/- 0.01 B=12.1 R=11.2. PLANET DEC=+29D40'20.40" +/- 0.1" Coordinates have been rounded. Reference Frame: ICRS Comments: Coordinates from USNO-B1.0 catalog. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.0006 -0.0078 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 11651( 4) - 21-Dec-2009 16:45:06 - [ 4] Visit: 01 Visit Requirements: BETWEEN 01-OCT-2008:14:33:34 AND 27-JUN-2010:14:33:34; Period 1.0914152 D AND ZERO-PHASE HJD2454474.04723 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 WASP-12 COS/NUV ACQ/SEA PSA MIRRORB SCAN-SIZE=2 1 16 S PHASE 0.8542891 TO RCH 0.855918 Comments: ETC ID #COS69602 gives t_exp=15.6 sec for S/N = 40 in NUV imaging PSA/MIRRORB for a G0 V star with B=12.1. ------------------------------------------------------------------------------------------------------------------------------------ 2 WASP-12 COS/NUV ACQ/IMA PSA MIRRORB 1 16 S GE Comments: ETC ID #COS69602 gives t_exp=15.6 sec for S/N = 40 in NUV imaging PSA/MIRRORB for a G0 V star with B=12.1. ------------------------------------------------------------------------------------------------------------------------------------ 3 WASP-12 COS/NUV TIME-TA PSA G285M 2676 BUFFER-TIME=5000 1 2334 S G Comments: Buffer time recommended by ETC (run ID #COS9176) is 8091 sec. Multiplied by 2/3 for safety gives 5394 sec. I rounded down to 5000 sec since we're well over an orbit anyway. ------------------------------------------------------------------------------------------------------------------------------------ 4 WASP-12 COS/NUV TIME-TA PSA G285M 2676 BUFFER-TIME=5000 1 3043 S G ------------------------------------------------------------------------------------------------------------------------------------ 5 WASP-12 COS/NUV TIME-TA PSA G285M 2676 BUFFER-TIME=5000 1 3043 S G ------------------------------------------------------------------------------------------------------------------------------------ 6 WASP-12 COS/NUV TIME-TA PSA G285M 2676 BUFFER-TIME=5000 1 3043 S G ------------------------------------------------------------------------------------------------------------------------------------ 7 WASP-12 COS/NUV TIME-TA PSA G285M 2676 BUFFER-TIME=5000 1 3043 S G ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WASP-12 1 COS/NUV ACQ/SEA PSA MIRRORB none none none none 1 N/A RCH WASP-12 2 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE 11651( 4) - 21-Dec-2009 16:45:06 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WASP-12 3 COS/NUV TIME-TA PSA G285M 2676 none none none none 1 N/A G WASP-12 4 COS/NUV TIME-TA PSA G285M 2676 none none none none 2 N/A G WASP-12 5 COS/NUV TIME-TA PSA G285M 2676 none none none none 3 N/A G WASP-12 6 COS/NUV TIME-TA PSA G285M 2676 none none none none 4 N/A G WASP-12 7 COS/NUV TIME-TA PSA G285M 2676 none none none none 5 N/A G 11651( 4) - 21-Dec-2009 16:45:06 - [ 6] Visit: 02 Visit Requirements: BETWEEN 01-OCT-2008:14:33:34 AND 27-JUN-2010:14:33:34; Period 1.0914152 D AND ZERO-PHASE HJD2454474.04723 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 WASP-12 COS/NUV ACQ/SEA PSA MIRRORB SCAN-SIZE=2 1 16 S PHASE 0.828342 TO RCH 0.829758 Comments: ETC ID #COS69602 gives t_exp=15.6 sec for S/N = 40 in NUV imaging PSA/MIRRORB for a G0 V star with B=12.1. ------------------------------------------------------------------------------------------------------------------------------------ 2 WASP-12 COS/NUV ACQ/IMA PSA MIRRORB 1 16 S GE Comments: ETC ID #COS69602 gives t_exp=15.6 sec for S/N = 40 in NUV imaging PSA/MIRRORB for a G0 V star with B=12.1. ------------------------------------------------------------------------------------------------------------------------------------ 3 WASP-12 COS/NUV TIME-TA PSA G285M 2695 BUFFER-TIME=5000 1 2334 S G Comments: Buffer time recommended by ETC (run ID #COS9176) is 8091 sec. Multiplied by 2/3 for safety gives 5394 sec. I rounded down to 5000 sec since we're well over an orbit anyway. ------------------------------------------------------------------------------------------------------------------------------------ 4 WASP-12 COS/NUV TIME-TA PSA G285M 2695 BUFFER-TIME=5000 1 3043 S G ------------------------------------------------------------------------------------------------------------------------------------ 5 WASP-12 COS/NUV TIME-TA PSA G285M 2695 BUFFER-TIME=5000 1 3043 S G ------------------------------------------------------------------------------------------------------------------------------------ 6 WASP-12 COS/NUV TIME-TA PSA G285M 2695 BUFFER-TIME=5000 1 3043 S G ------------------------------------------------------------------------------------------------------------------------------------ 7 WASP-12 COS/NUV TIME-TA PSA G285M 2695 BUFFER-TIME=5000 1 3043 S G ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WASP-12 1 COS/NUV ACQ/SEA PSA MIRRORB none none none none 1 N/A RCH WASP-12 2 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE 11651( 4) - 21-Dec-2009 16:45:06 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ WASP-12 3 COS/NUV TIME-TA PSA G285M 2695 none none none none 1 N/A G WASP-12 4 COS/NUV TIME-TA PSA G285M 2695 none none none none 2 N/A G WASP-12 5 COS/NUV TIME-TA PSA G285M 2695 none none none none 3 N/A G WASP-12 6 COS/NUV TIME-TA PSA G285M 2695 none none none none 4 N/A G WASP-12 7 COS/NUV TIME-TA PSA G285M 2695 none none none none 5 N/A G 11651( 4) - 21-Dec-2009 16:45:06 - [ 8] Summary Form for Proposal 11651 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, ACQ/SEARCH, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=5000, SCAN-SIZE=2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-OCT-2008:14:33:34 AND 27-JUN-2010:14:33:34, PHASE 0.828342 TO 0.829758, PHASE 0.8542891 TO 0.855918, Period 1.0914152 D AND ZERO-PHASE HJD2454474.04723 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G285M, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names WASP-12 ------------------------------------------------------------------------------------------------------------------------------------