0 Assigned ID: 186 ----- Attempting Submission 1 (Thu Apr 07 02:46:41 GMT 2016) ----- 0 I've tried to plan the observations to be schedulable around the SAA, but I know these are going to be challenging. Different strategies could work, so modifications can be made if need be. 244363261 ----- Attempting Submission 1 (Wed Jul 20 16:10:50 GMT 2016) ----- The Evaporating Exosphere of a Young Planet Young planetary systems offer the opportunity to study the early stages of planetary and atmospheric evolution. Exoplanets in young stellar clusters, which have known ages, provide a valuable benchmark for models of these processes. K2-25b is a Neptune-sized exoplanet recently found to transit a mid M dwarf member of the Hyades open cluster (625 Myr from isochrone fitting). Atmospheric escape is thought to play an important role in sculpting the final compositions of low-mass planets like K2-25b. At 3.7 Earth-radii, K2-25b may represent the puffy precursor to the close-in super-Earths and mini-Neptunes found around older mid M dwarfs. This star's youth, proximity and high levels of activity offer a unique opportunity to study atmospheric evaporation. We propose to observe two transits of K2-25b at Lyman alpha wavelengths in order to determine the size of the planetary exosphere. We have simulated the expected Lyman alpha spectrum of this star using representative a stellar profile and interstellar absorption, and considered the intrinsic stellar variability. We estimate that we will obain a S/N of 14.7 in the integrated flux in the blue wing of the Lyman alpha line, where the transit signal is expected. A 50% Lyman alpha transit depth was recently observed for Gl 436b, which is a Neptune-sized planet in orbit around an old, inactive M dwarf. Our observations will result in a 10.6 sigma detection of the planetary exosphere if the transit is the same depth as for Gl 436b. With this program, we will observe the exoplanet host K2-25 (an M dwarf) with STIS/G140M at Lyman-alpha wavelengths. We want to measure the transit of the planetary exosphere (escaping gas from the planet), which is expected to result in very deep, long-duration Lyman-alpha eclipses of the star. The expected eclipses are significantly longer than the white-light transit, and are expected to last around 10 hours. The goal of this program is to conclusively detect the Lyman-alpha eclipse and its shape, thereby constraining mass-loss from the planet. We will observe two eclipses, with 8 HST orbits per eclipse over a +-10 hour baseline to either side of the white-light transit. HST orbits should be spread as evenly as possible over the 20-hour duration (see figure in phase 1 proposal). To avoid South Atlantic Anomaly crossings and aid scheduling, our nominal observing strategy is for each eclipse to be sampled by 3 blocks of 2-3 HST orbits each (pre-transit, in-transit, and post-transit). A pre-transit baseline of 2-3 HST orbits occuring roughly 10 hours before white-light transit is important to understand the intrinsic Lyman-alpha variability. Ideally one HST orbit for each eclipse will occur during the white-light transit window. Extended coverage of roughly 10 hours pre- and post-transit is necessary to capture the full predicted behavior of the Lyman-alpha eclipse. The instrument settings are similar to those in GO14462, however we will use the 52X0.1 aperture. The aperture will be centered on 1222 Angstroms and we will use TIME-TAG mode. We request an additional GO-WAVECAL after the conclusion of the science observation, during Earth-occultation. Extrasolar Planets and Planet Formation 12 false true false false false false SUPPORTED STAR M V-IV NO RA and Dec from 2MASS coordinates corrected to epoch 2000 using the measured proper motions. Proper motion in RA and Dec were entered by hand using the values from Roser et al. (2011) as quoted by Mann et al. (2016). V magnitude from APASS as quoted by Mann et al. (2016), remaining magnitudes also reported in that work. RV from Mann et al. (2016). Errors in RA and Dec include the errors on the proper motion (+-3mas/yr*17yrs) added in quadrature to the uncertainties on the 2MASS positions (+-0.06as). EPIC210490365 2MASSJ04130560+1514520 J2000 J2000 B=17.76, g=16.73, r=15.23, i=13.76, z=12.82, J=11.30, H=10.73, Ks=10.44 STIS/FUV-MAMA Spectroscopic No No G140M 1222 Timing link suitability includes constraints ([02 After 01 by 0.5 to 0.6 days]) The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. This visit corresponds to Eclipse 1, and is the first of three visits associated with this eclipse event. This visit should occur roughly 10-15 hours prior to the white-light transit event (specified by the period and phase entries for the "in transit" visit) in order provide a baseline Lyman-alpha flux level. The visit consists of 3 HST orbits. (Tic-Visit :proposal-id 14615 :visit-id "01" :proposal-version -1 :trans-version "20160601" :date "19-Jul-2016 15:07:28.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 523264 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14615 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14615 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2888 :al-overhead-at-end 0 :internal-dur-at-end 303 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3221 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14615 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2999 :al-overhead-at-end 0 :internal-dur-at-end 303 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3221 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14615 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2999 :al-overhead-at-end 0 :internal-dur-at-end 622 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3221 :pcs-gap 0 ) true 3 0 Timing link suitability includes constraints ([02 After 01 by 0.5 to 0.6 days] [03 After 02 by 0.4 to 0.5 days]) The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. This visit corresponds to Eclipse 1, and is the middle of three visits associated with this eclipse event. This visit corresponds to the white-light transit event specified by the period and phase. In the ideal case, one of the orbits should actually coincide to within 30min of phase=1. The visit consists of 3 HST orbits. 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CASM was run in Phase II mode. This visit corresponds to Eclipse 1, and is the last of three visits associated with this eclipse event. This visit should occur roughly 10 hours after to the white-light transit event. The visit consists of 2 HST orbits. (Tic-Visit :proposal-id 14615 :visit-id "03" :proposal-version -1 :trans-version "20160601" :date "19-Jul-2016 15:07:18.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 348848 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14615 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14615 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2888 :al-overhead-at-end 0 :internal-dur-at-end 303 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3221 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14615 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2999 :al-overhead-at-end 0 :internal-dur-at-end 622 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3221 :pcs-gap 0 ) true 2 0 Timing link suitability includes constraints ([05 After 04 by 0.3 to 0.6 days]) The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. This visit corresponds to Eclipse 2 and is the first of three visits associated with this eclipse event. This visit should occur roughly 10 hours prior to the white-light transit event (specified by the period and phase entries for the "in transit" visit) in order provide a baseline Lyman-alpha flux level. The visit consists of 2 HST orbits. (Tic-Visit :proposal-id 14615 :visit-id "04" :proposal-version -1 :trans-version "20160601" :date "19-Jul-2016 15:07:14.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 348848 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14615 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14615 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2888 :al-overhead-at-end 0 :internal-dur-at-end 303 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3221 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14615 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2999 :al-overhead-at-end 0 :internal-dur-at-end 622 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3221 :pcs-gap 0 ) true 2 0 Timing link suitability includes constraints ([05 After 04 by 0.3 to 0.6 days] [06 After 05 by 0.2 to 0.4 days]) The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. This visit corresponds to Eclipse 2, and is the middle of three visits associated with this eclipse event. This visit should occur during the white-light transit event specified by the period and phase. The visit consists of 3 HST orbits. 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CASM was run in Phase II mode. This visit corresponds to Eclipse 2, and is the last of three visits associated with this eclipse event. This visit should commence roughly 5 hours after the white-light transit event. The visit consists of 3 HST orbits. 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