The Kepler mission has detected an amazingly rich diversity of extra-solar planet candiates. A large amount of them are grouped in multiple system, orbiting the same host star. We have now the opportunity to characterize and compare the diversity of exoplanetary worlds within one multiple system, and with planets from other systems, thus opening a new window to the field of comparative exoplanetology. We propose to observe the atmospheres of the two confirmed Saturn-like planets which orbit the same host star, Kepler-9b and Kepler-9c. The planetary atmospheres will be probed using transmission spectroscopy observations from 1.1 to 1.7 microns with HST/WFC3. When combined with results from Kepler, the WFC3 data will reveal the presence of water and methane absorption features for each planet. These molecules are expected to be present in gas phase in the warm atmopsheres of these objects. Comparing these observations to giant planet atmospheric models, the molecular abundances and the overall envelope metallicities can be retrieved since models are locked down to the Kepler measurements. Furthermore, the relative metallicity between these two planets can be derived. Such measurements help to constrain planetary formation and evolution theories. The presence of water in the earth atmosphere precludes such observations from the ground at the required precision since we intend to detect water absorption in the gas layer surrounding extrasolar planets. Only HST that can be used for this investigation. We propose four separate visits, each consisting of five orbits, to obtain spectra of exoplanetary transits. Each visit starts with a direct image in IRSUB512/F139M. Every orbit consists of a sequence of GRISM128/G141 exposures. The field is crowded (in particular a bright star stands at 30 arcsecs from Kepler-9), so we apply Orientation constraints to avoid order overlaps in the spectrum of interrest. No dithering will be employed on any of these observations. Lacking flat fields accurate to the necessary precision, we need to keep the target in the same position on the detector for this differential measurement. As the transmission spectroscopy signal we aim to measure is only present when the planet is in front of the star, we require strict scheduling constraints to ensure the scientific return of the project. Each visit, we require 2 orbits overlaps with the transit. If such phase constraints prove unscheduable, they could be relaxed slightly but with an associated loss of observational efficiency. We plan to submit a new Phase-II with better planetary ephemeris. The two planet exhibit Transit Timing Variations (TTVs) and better predictions will be made as soon as we will have new data from the Kepler mission. EXTRA-SOLAR PLANETS 12 false 0.0 0.0 false false false false AVAILABLE STAR G V-IV This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 WFC3/IR Spectroscopic No No G141 The scheduling data was generated by CASM 20.0. CASM was run in Phase II mode. Transit-1 Kepler-9b Timing constraints for the first exposures of each visit. 1339724205000 202.19757894921293 (Tic-Visit :proposal-id 12482 :visit-id "01" :proposal-version -1 :trans-version "20111111" :date "10-May-2012 08:09:43.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2139568 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12482 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12482 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2677 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3022 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2781 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3022 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2781 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3022 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2710 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3022 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "01" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2731 :al-overhead-at-end 0 :internal-dur-at-end 457 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3022 :pcs-gap 0 ) true 5 0 This exposure has phase constraints. It should start between 0.99023357 and 0.99073357 (1 correspond to mid-transit). This allows to have two orbits during transit. Timing Constraint : First exposition should start between: UT : YR MON DAY HR MIN 2012 5 26 20 17 and 2012 5 26 20 31 2012 6 15 1 32 and 2012 6 15 1 46 2012 7 4 6 47 and 2012 7 4 7 1 2012 7 23 12 2 and 2012 7 23 12 16 2012 8 11 17 18 and 2012 8 11 17 32 2012 8 30 22 34 and 2012 8 30 22 48 2012 9 19 3 51 and 2012 9 19 4 4 2012 10 8 9 7 and 2012 10 8 9 21 2012 10 27 14 25 and 2012 10 27 14 39 2012 11 15 19 41 and 2012 11 15 19 55 2012 12 5 1 0 and 2012 12 5 1 13 2012 12 24 6 17 and 2012 12 24 6 31 This exposure will execute during SAA passage on orbit 4. This exposure will execute during SAA passage on orbit 5. The scheduling data was generated by CASM 20.0. CASM was run in Phase II mode. Transit-2 Kepler-9b Timing constraints for the first exposures of each visit. 1344705700000 140.414448563412 (Tic-Visit :proposal-id 12482 :visit-id "02" :proposal-version -1 :trans-version "20120125" :date "08-May-2012 15:33:25.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2312448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12482 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12482 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2861 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "02" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "02" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 443 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) false 5 0 This exposure has phase constraints. It should start between 0.99023357 and 0.99073357 (1 correspond to mid-transit). This allows to have two orbits during transit. Timing Constraint : First exposition should start between: UT : YR MON DAY HR MIN 2012 5 26 20 17 and 2012 5 26 20 31 2012 6 15 1 32 and 2012 6 15 1 46 2012 7 4 6 47 and 2012 7 4 7 1 2012 7 23 12 2 and 2012 7 23 12 16 2012 8 11 17 18 and 2012 8 11 17 32 2012 8 30 22 34 and 2012 8 30 22 48 2012 9 19 3 51 and 2012 9 19 4 4 2012 10 8 9 7 and 2012 10 8 9 21 2012 10 27 14 25 and 2012 10 27 14 39 2012 11 15 19 41 and 2012 11 15 19 55 2012 12 5 1 0 and 2012 12 5 1 13 2012 12 24 6 17 and 2012 12 24 6 31 The scheduling data was generated by CASM 20.0. CASM was run in Phase II mode. Transit-1 Kepler-9c Timing constraints for the first exposures of each visit. 1340126357000 197.44456838672636 (Tic-Visit :proposal-id 12482 :visit-id "03" :proposal-version -1 :trans-version "20120125" :date "08-May-2012 15:36:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2168384 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12482 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12482 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2677 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2781 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "03" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2781 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "03" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2781 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "03" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2781 :al-overhead-at-end 0 :internal-dur-at-end 443 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) false 5 0 This exposure has phase constraints. It should start between 0.99506590 and 0.99546590 (1 correspond to mid-transit). This allows to have two orbits during transit. Timing Constraints : First exposition should start between: UT : YR MON DAY HR MN 2012 5 11 15 34 and 2012 5 11 15 57 2012 6 19 17 25 and 2012 6 19 17 48 2012 7 28 19 17 and 2012 7 28 19 40 2012 9 5 21 9 and 2012 9 5 21 31 2012 10 14 22 59 and 2012 10 14 23 22 2012 11 23 0 49 and 2012 11 23 1 11 The scheduling data was generated by CASM 20.0. CASM was run in Phase II mode. Transit-2 Kepler-9c Please note the timing constraints for the first exposures of each visit. (Tic-Visit :proposal-id 12482 :visit-id "04" :proposal-version -1 :trans-version "20120125" :date "08-May-2012 15:39:18.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2312448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12482 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12482 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2847 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "04" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "04" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12482 :visit-id "04" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 443 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) false 5 0 This exposure has phase constraints. It should start between 0.99506590 and 0.99546590 (1 correspond to mid-transit). This allows to have two orbits during transit. Timing Constraints : First exposition should start between: UT : YR MON DAY HR MN 2012 5 11 15 34 and 2012 5 11 15 57 2012 6 19 17 25 and 2012 6 19 17 48 2012 7 28 19 17 and 2012 7 28 19 40 2012 9 5 21 9 and 2012 9 5 21 31 2012 10 14 22 59 and 2012 10 14 23 22 2012 11 23 0 49 and 2012 11 23 1 11