Search for an evaporating ocean on the super-Earth HD 97658b

0 Assigned ID: 858 ----- Attempting Submission 1 (Fri Apr 11 21:23:32 GMT 2014) ----- The number of orbits used exceeds the number allocated ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN Following the preliminary analysis of Visits 1 and 3 for Program #13820, and using updated ephemeris for the planetary transit, we found out that the phase coverage of the transit is later than expected. Because the remaining Visit (Visit #2) is flight ready and does not allow any changes, we duplicated it in a Visit #4 with updated phase constraints and ephemeris The updated phase constraints are: from 0.979 to 0.971 for the lower constraint from 0.9845 to 0.982 for the upper constraint The updated ephemeris are: Zero phase = 2456665.46415 period=9.489264 days -2006330328 ----- Attempting Submission 1 (Thu Jul 24 17:15:39 GMT 2014) ----- ----- Attempting Submission 2 (Wed Sep 24 09:51:02 GMT 2014) ----- ----- Attempting Submission 3 (Fri Sep 26 16:18:14 GMT 2014) ----- ----- Attempting Submission 4 (Mon Sep 29 08:14:34 GMT 2014) ----- ----- Attempting Submission 5 (Tue Feb 24 15:20:45 GMT 2015) ----- ----- Attempting Submission 6 (Tue Jul 28 20:07:47 GMT 2015) ----- ----- Attempting Submission 7 (Wed Jul 29 21:46:08 GMT 2015) ----- ----- Attempting Submission 8 (Wed Dec 16 07:26:10 GMT 2015) ----- No changes expect for the upper phase constraint, by about 13 min. This has been made to better accomodate an observation window on 2015 Dec 11 Search for an evaporating ocean on the super-Earth HD 97658b The HD 97658b super-Earth was recently detected in transit across one of the brightest star (V=7.7) known to host a transiting planet. The density of the planet suggests it must contain a large mass fraction of water. Although the water vapor has not been detected in the lower atmosphere by HST/WFC3 due to the small atmospheric scale height, the moderate orbital distance of this warm (700-1000 K) planet favors the atmospheric escape of this water, which should be promptly dissociated at high altitude and become observable as hydrogen flowing within and beyond the Roche lobe. The parent star properties are similar to those of HD 189733 (K dwarf, V=7.8, d=20 pc) and numerical simulations show that the halo of atomic hydrogen resulting from the dissociation of water is observable with HST/STIS at Lyman-alpha (121 nm). The detection of this atomic hydrogen will be the first signature of an evolved evaporating ocean on an extrasolar planet, as well as the first validation of internal structure models of exoplanets in this mass regime. A non-detection of escaping hydrogen, as in the case of 55 Cnc e, would also bring useful constraints on the nature of the planetary atmosphere (CO2-rich vs. H2O-rich?), the fate of super-Earths, and the progenitors of the rocky evaporation remnants detected by CoRoT and Kepler. This program consists in 3 visits of 5 HST orbits. In each visit, we will observe the transit of an exoplanet (HD 97658b) in front of its host star. Transits occur every 9.49 days (the orbital period of the planet) and last for 2.8 hours. The timing requirements are set as phase constraints on the first ACQ exposure of the first orbit in a visit. The goal is to observe the star during two HST orbits before the transit, one or two HST orbits during the transit, and one or two HST orbits after the transit. The phase constraints are slightly different from visits #1 and #3 than from visit #2 to enable a coverage of the transit as full as possible (with respect to Earth occultations). The allowed start phase range is ~13 min. EXTRA-SOLAR PLANETS 12 false true false false AVAILABLE STAR EXTRA-SOLAR PLANETARY SYSTEM K V-IV The J=2000 coordinates are from the GSC 2.3 (hstID: N6O1000085). The uncertainties on coordinates, proper motions, and annual parallax comes from SIMBAD. The star has Hipparcos astrometric coordinates (HIP 54906). HIP54906 GSC01981-01168 J2000 J2000 U=9.049, B=8.569 STIS/FUV-MAMA Spectroscopic No No G140M 1222 1438206282822 The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 1449806237000 291.2992740260385 (Tic-Visit :proposal-id 13820 :visit-id "01" :proposal-version -1 :trans-version "20150609" :date "29-Jul-2015 23:44:41.0" :trans-errors '(:WARNINGS 5 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 785952 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13820 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13820 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2666 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "01" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 639 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) false 5 5 The ETC run # refers to a previous run performed for a nearly identical programme with the target star HD 189733, which is a close twin of HD 97658b: same V magnitude, same stellar distance, and same spectral type. Hence, we expect a very similar Lyman-alpha emission profile. Previous STIS/G140M spectrum of HD 189733 has been used as input to the ETC (user uploaded spectrum). We are basically photon-starved and set the exposure time to the maximum possible value. 1424790642240 The scheduling data was generated by CASM 23.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13820 :visit-id "02" :proposal-version -1 :trans-version "20150128" :date "24-Feb-2015 16:10:41.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 785952 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13820 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13820 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2666 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "02" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "02" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 639 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) false 5 0 The ETC run # refers to a previous run performed for a nearly identical programme with the target star HD 189733, which is a close twin of HD 97658b: same V magnitude, same stellar distance, and same spectral type. Hence, we expect a very similar Lyman-alpha emission profile. Previous STIS/G140M spectrum of HD 189733 has been used as input to the ETC (user uploaded spectrum). We are basically photon-starved and set the exposure time to the maximum possible value. 1450250519365 The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. /private/var/folders/33/rs56p2wx5q174bfyvvm_nq1m0000gn/T/OPVisit2067365445202372413.xml (Tic-Visit :proposal-id 13820 :visit-id "04" :proposal-version -1 :trans-version "20150609" :date "16-Dec-2015 08:21:58.0" :trans-errors '(:WARNINGS 5 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 785952 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13820 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13820 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2666 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "04" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "04" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "04" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 639 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 5 5 The ETC run # refers to a previous run performed for a nearly identical programme with the target star HD 189733, which is a close twin of HD 97658b: same V magnitude, same stellar distance, and same spectral type. Hence, we expect a very similar Lyman-alpha emission profile. Previous STIS/G140M spectrum of HD 189733 has been used as input to the ETC (user uploaded spectrum). We are basically photon-starved and set the exposure time to the maximum possible value. 1424790442096 The scheduling data was generated by CASM 23.0. CASM was run in Phase II mode. 1428480680000 136.62577956287788 (Tic-Visit :proposal-id 13820 :visit-id "03" :proposal-version -1 :trans-version "20150128" :date "24-Feb-2015 16:07:21.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 785952 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13820 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13820 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2666 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "03" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "03" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 320 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13820 :visit-id "03" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 639 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) false 5 0 The ETC run # refers to a previous run performed for a nearly identical programme with the target star HD 189733, which is a close twin of HD 97658b: same V magnitude, same stellar distance, and same spectral type. Hence, we expect a very similar Lyman-alpha emission profile. Previous STIS/G140M spectrum of HD 189733 has been used as input to the ETC (user uploaded spectrum). We are basically photon-starved and set the exposure time to the maximum possible value.