14500( 7) - 20-Apr-2016 19:44:36 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14500 Version: 7 Check-in Time: 20-Apr-2016 19:44:36 STScI Edit Number: 5 Title Two Birds One Stone: Simultaneous Atmospheric Pre-Screening of Two Temperate Earth-Sized Exoplanets During Their Double Transit ------------------------------------------------------------------------------------ Type Cycle GO/DD 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Julien de Wit Massachusetts Institute of Technology Y CoI: Dr. Michael Gillon Universite de Liege N CoI: Artem Burdanov Universite de Liege N CoI: Prof. Adam J. Burgasser University of California - San Diego N CoI: Laetitia Delrez Universite de Liege N CoI: Dr. Brice-Olivier Demory University of Cambridge N CoI: Dr. Emmanuel Jehin Universite de Liege N CoI: Prof. Susan Lederer NASA Johnson Space Center N CoI: Dr. Nikole K Lewis Space Telescope Science Institute N CoI: Prof. Pierre Magain Universite de Liege N CoI: Prof. Didier Queloz University of Cambridge N CoI: Dr. Amaury Triaud University of Cambridge N CoI: Dr. Valerie Van Grootel Universite de Liege N ------------------------------------------------------------------------------------ Abstract We have detected three temperate Earth-sized planets transiting an ultra-cool dwarf star only 12 pc away, TRAPPIST-1. This discovery sparks the era of detailed characterization and habitability assessment of Earth-sized exoplanets. It also opens a new chapter for exoplanetology: comparative planetology in the realm of temperate terrestrial planets. TRAPPIST-1's system is currently the subject of an intense, worldwide follow-up effort that spans the electromagnetic spectrum from the UV to radio. Being uniquely suited for NIR and UV high-precision observations, HST has a key role to play in this follow-up effort. Updated ephemerids resulting from two Spitzer DDTs show that TRAPPIST-1 b and c will transit simultaneously on May 4th, 2016 at 9h10 UT providing a unique and rare opportunity to study for the first time, and simultaneously, the atmospheres of temperate Earth-sized planets outside of the Solar System. We propose a 4-orbit pre-screening program with WFC3 to definitely test the H/He-dominated atmospheric scenario for these planets and determine the relative inclination of both planets, bringing invaluable constraints on the dynamical history of the system. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose to observe the simultaneous transits on May 4th of the two inner planets of the Ultra Cool Dwarf TRAPPIST-1 with WFC3 to determine the planetary transmission spectra. The visit will consist of four orbits timed such that 14500( 7) - 20-Apr-2016 19:44:36 - [ 2] that two happen before the transit, one happens during the double transit (8:47UT to 9:32UT), and one happens after the transit. ------------------------------------------------------------------------------------ 14500( 7) - 20-Apr-2016 19:44:36 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J23062 STAR, EXTRA-SOLAR RA=23H06M30.2880S, J2000 V = 18.798 R=16.47, I=14.02, J=11.35, 928-0502285 PLANET, EXTRA-SOLAR DEC=-05D02'36.30" K=10.30 PLANETARY SYSTEM Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 14500( 7) - 20-Apr-2016 19:44:36 - [ 4] Visit: 01 Visit Requirements: BETWEEN 04-MAY-2016:05:20:00 AND 04-MAY-2016:06:10:00; VISIBILITY INTERVAL 53 M 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 2MASS-J2306 WFC3/IR MULTIAC IRSUB256 F139M SAMP-SEQ=RAPID, NSAMP=10 1 DEF (2.778 GS ACQ SCENARIO BASE1B3 2928-050228 CUM S) 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J2306 WFC3/IR MULTIAC GRISM256 G141 SAMP-SEQ=SPARS25, NSAMP=6 37 DEF SPATIAL SCAN 0.027, 90.0 2928-050228 CUM (8288.593 Degrees, Round trip 5 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J23062928-050 1 WFC3/IR MULTIAC IRSUB256 F139M none none none none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 3 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 3 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 4 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 4 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 5 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 5 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 6 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 6 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 7 none 1 N/A 2285 CUM 14500( 7) - 20-Apr-2016 19:44:36 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 7 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 8 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 8 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 9 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 9 none 1 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 10 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 10 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 11 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 11 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 12 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 12 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 13 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 13 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 14 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 14 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 15 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 15 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 16 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 16 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 17 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 17 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 18 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 18 none 2 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 19 none 2 N/A 2285 CUM 14500( 7) - 20-Apr-2016 19:44:36 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 19 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 20 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 20 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 21 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 21 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 22 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 22 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 23 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 23 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 24 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 24 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 25 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 25 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 26 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 26 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 27 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 27 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 28 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 28 none 3 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 29 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 29 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 30 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 30 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 31 none 4 N/A 2285 CUM 14500( 7) - 20-Apr-2016 19:44:36 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 31 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 32 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 32 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 33 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 33 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 34 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 34 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 35 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 35 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 36 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 36 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 37 none 4 N/A 2285 CUM 2MASS-J23062928-050 2 WFC3/IR MULTIAC GRISM256 G141 none none 37 none 4 N/A 2285 CUM 14500( 7) - 20-Apr-2016 19:44:36 - [ 8] Summary Form for Proposal 14500 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures GRISM256, IRSUB256 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=10, NSAMP=6, SAMP-SEQ=RAPID, SAMP-SEQ=SPARS25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 04-MAY-2016:05:20:00 AND 04-MAY-2016:06:10:00, GS ACQ SCENARIO BASE1B3, SPATIAL SCAN 0.027, 90.0 Degrees, Round trip, VISIBILITY INTERVAL 53 M ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F139M, G141 ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2MASS-J23062928-0502285 ------------------------------------------------------------------------------------------------------------------------------------