0 Assigned ID: 1398 ----- Attempting Submission 1 (Wed Mar 17 19:07:08 GMT 2021) ----- HOPR 92681 single orbit repeat request -1049318857 ----- Attempting Submission 1 (Tue Jul 20 16:38:58 GMT 2021) ----- Your proposal could not be saved. Submission aborted. ----- Attempting Submission 2 (Fri Dec 02 03:16:55 GMT 2022) ----- ----- Attempting Submission 3 (Wed Sep 20 15:30:10 GMT 2023) ----- ----- Attempting Submission 4 (Wed Nov 15 18:24:04 GMT 2023) ----- 1 additional orbit granted via a HOPR H I Lyman alpha, the most sensitive probe of exoplanet upper atmospheres and escaping material, is generally unable to probe material bound to or weakly escaping from a planet because of severe attenuation from the interstellar medium in the line core. This attenuation hinders our understanding of atmospheric escape, a process likely responsible for shaping the demographics of close-in exoplanets that we observe today, as well as properties of individual exoplanets including habitability. The newly discovered warm Neptune TOI-1231b will allow us to probe the exosphere region where planetary winds are launched due to a unique property of its host star. The host star's radial velocity (+70.5 km/s) Doppler shifts the star's Lyman alpha emission and the planet's Lyman alpha absorbers out of the 100% ISM attenuation zone allowing us to see the stellar line core and use it as a backlight for transit observations. The proposed STIS transit observation of TOI-1231b will be a novel dataset on which to test the validity of hydrodynamic escape models, a set of assumptions at the underpinning of all interpretations of all Lyman alpha transit detections to date. We will observe a transit TOI-1231b with a single visit of five consecutive orbits. To capture Lyman alpha (1216 Ang), we will use STIS G140M with the 52"x0.1" slit and 1222 cenwave. Time-tag mode will be used to model and remove the STIS breathing effect and remove any flares from the data. We select wavecal=no to increase the duty cycle of the STIS observations, and we add a wavelength calibration exposure during the Earth occultation at the end of each orbit. The transit duration of TOI-1231b is 3.3 +/- 0.04 hours (approx. 2 orbits), and we have setup the visit timing requirements to achieve a visit setup of 2 orbits pre-transit, 2 orbits in-transit, and 1 orbit post-transit. We have also limited the time of year to between Jan 31 and Dec 3 (any year) to prevent the airglow emission from coinciding with the spectral region of interest. Dr. Allison Youngblood is an expert in Lyman alpha spectroscopy of M dwarfs (e.g., Youngblood et al 2016, ApJ, 824, 101), H I absorption in the interstellar medium, and has direct experience with Lyman alpha transit spectroscopy with the STIS instrument (Garcia Munoz 2020, ApJL, 888, 21). She is the PI of several STIS spectroscopy programs of cool dwarf stars. Dr. Antonio Garcia Munoz is an expert in modeling the upper atmospheres of exoplanets and will use his 1D model (Garcia Munoz 2020, ApJL, 888, 21) to analyze this program's transit data. Dr. Eric Lopez has published multiple papers on the topic of atmospheric escape in exoplanet populations (e.g., Lopez et al. 2012, ApJ, 761, 59). Dr. Kevin France is an experienced UV spectroscopist who has participated in multiple Lyman alpha transit experiments and has published papers on the estimation of EUV spectra for dwarf stars (e.g., France et al. 2018, ApJSS, 239, 16). Dr. Jennifer Burt is the lead author of the discovery paper of the planet TOI-1231b, and Drs. Ethan Kruse and Veselin Kostov are experts on the discovery and validation of exoplanet candidates. Exoplanets and Exoplanet Formation 6 false false true false false false false false SUPPORTED STAR EXTRA-SOLAR PLANET EXTRA-SOLAR PLANETARY SYSTEM M V-IV NO Coordinates from Gaia EDR3. In order to ensure that the airglow does not overlap with the spectral region of interest, Hubble must not observe this target between Dec 03 and Jan 30 (any year). TOI-1231 J2000 J2000 STIS/FUV-MAMA Spectroscopic No No G140M 1222 1669950750945 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. 1693496736000 185.0 (Tic-Visit :proposal-id 16700 :visit-id "01" :proposal-version -1 :trans-version "20220630" :date "01-Dec-2022 22:12:30.0" :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 1131120 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16700 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16700 :visit-id "01" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2940 :al-overhead-at-end 0 :internal-dur-at-end 360 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16700 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2941 :al-overhead-at-end 0 :internal-dur-at-end 360 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16700 :visit-id "01" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2941 :al-overhead-at-end 0 :internal-dur-at-end 360 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16700 :visit-id "01" :orbit-number 4 :pcs-time 392 :si-vis-utilization 2941 :al-overhead-at-end 0 :internal-dur-at-end 360 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16700 :visit-id "01" :orbit-number 5 :pcs-time 392 :si-vis-utilization 2941 :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 3333 :pcs-gap 0 ) false 5 0 See STIS.sp.1479879, STIS.sp.1479877, and STIS.sp.1479876 for our ETCs with realistic estimates of the Lyman alpha emission in-transit and out-of-transit. See STIS.sp.1479879, STIS.sp.1479877, and STIS.sp.1479876 for our ETCs with realistic estimates of the Lyman alpha emission in-transit and out-of-transit. See STIS.sp.1479879, STIS.sp.1479877, and STIS.sp.1479876 for our ETCs with realistic estimates of the Lyman alpha emission in-transit and out-of-transit. See STIS.sp.1479879, STIS.sp.1479877, and STIS.sp.1479876 for our ETCs with realistic estimates of the Lyman alpha emission in-transit and out-of-transit. See STIS.sp.1479879, STIS.sp.1479877, and STIS.sp.1479876 for our ETCs with realistic estimates of the Lyman alpha emission in-transit and out-of-transit. 1695223704986 Phase windows are not calculated when the gap between schedulable intervals is less than 1 days, assuming no scheduling restrictions for constraint Phase 0.009/0.991. The scheduling data was generated by CASM 31.1. CASM was run in Phase II mode. 1699324868000 259.8777894146308 (Tic-Visit :proposal-id 16700 :visit-id "02" :proposal-version -1 :trans-version "20230626" :date "20-Sep-2023 11:28:24.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 226608 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16700 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16700 :visit-id "02" :orbit-number 1 :pcs-time 443 :si-vis-utilization 2880 :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 3323 :pcs-gap 0 ) false 1 0 See STIS.sp.1479879, STIS.sp.1479877, and STIS.sp.1479876 for our ETCs with realistic estimates of the Lyman alpha emission in-transit and out-of-transit. 1700072524580 Phase windows are not calculated when the gap between schedulable intervals is less than 1 days, assuming no scheduling restrictions for constraint Phase 0.009/0.991. The scheduling data was generated by CASM 31.1. CASM was run in Phase II mode. /private/var/folders/51/d9fx8d_x10s7sp3fbpfns04cs2q3k7/T/OPVisit285616313388545937.xml (Tic-Visit :proposal-id 16700 :visit-id "03" :proposal-version -1 :trans-version "20230626" :date "15-Nov-2023 13:22:04.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 226608 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16700 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16700 :visit-id "03" :orbit-number 1 :pcs-time 443 :si-vis-utilization 2880 :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 3323 :pcs-gap 0 ) true 1 0 See STIS.sp.1479879, STIS.sp.1479877, and STIS.sp.1479876 for our ETCs with realistic estimates of the Lyman alpha emission in-transit and out-of-transit.