0 Assigned ID: 2949 ----- Attempting Submission 1 (Thu Mar 24 05:42:10 GMT 2022) ----- HST Phase I Proposal 2949 successfully submitted. Receipt: # 2949-1 ----- Attempting Submission 2 (Fri Mar 25 06:02:53 GMT 2022) ----- Visit 3 Phase requirement removed Received field global health and safety warning from BOT, likely because it is assuming an OIII giant spectral type for the star. ETC shows target is safe for STIS observations. -725540033 ----- Attempting Submission 1 (Thu Jul 07 04:46:06 GMT 2022) ----- ----- Attempting Submission 2 (Tue Feb 20 03:10:59 GMT 2024) ----- Orbit planner and visit planner has been run. Probing for the extended exosphere of a 100 Myr mini-Neptune Photoevaporation shapes the Neptunes and super-Earths that we find in abundance around Sun-like stars. We will use STIS to probe for the escaping hydrogen exosphere of a mini-Neptune that is undergoing run-away mass-loss. HIP 94235b is a newly discovered planet around a 100 Myr old X-ray active Sun-like star in the AB Doradus moving group. It lies on the edge of the sub-Neptune desert that is thought to be sculpted by early photoevaporation. Unlike previous planets surveyed by HST with detected Lyman alpha escaping atmospheres, HIP 94235b is younger than its run-away mass-loss timescale, and is in the process of shedding the majority of its primordial hydrogen helium envelope. We will observe three Lyman alpha transits of HIP 94235b with STIS, and search for signatures of a significant neutral hydrogen exopshere. We expect transits with >10% transits to be detectable at high significance despite the stellar activity expected for such young stars. Comparing the true mass-loss rate against the energy-limited estimates will help us better understand the factors that govern the early evaporation history of young Neptunes. The extreme XUV environment HIP 94235b resides in will also help guide models of interactions between the stellar wind and escaping hydrogen atmospheres, crucial in interpreting all Lyman alpha transit results from past HST observations. Our program will observe three transits of HD178085b with STIS MAMA-FUV G140M 1222A to measure the planet's radius in Lyman alpha. Each visit will include five consecutive orbits. Visits 1 and 2 are timed to allow for orbit 1 to occur pre-ingress to establish the pre-transit baseline, orbits 2-3 in-transit, orbits 4-5 out of transit. Visit 3 is timed such that orbits 1-2 occur pre-ingress, 3-4 in-transit, and orbit 5 post-egress. Our timing requriement for the first exposure includes a 60 minute window to allow for scheduling flexibility. We can accept a wider phase window (upto 1 orbit) if required. With three visits, we are confident that the transit will be well sampled at the end of the program. The first exposure of each visit includes an ACQ and an ACQ/peak exposure. Each orbit include a single science exposure and a wavecal exposure, with the science exposure of the first orbit made shorter to allow for acquisition. Reduced gyro mode will impact the schedulability of the observations. We do not anticipate science impacts from 2-wheeled operations. Our team includes experts in the discovery, characterization, and modeling of planets around young stars. Prof Elisabeth Newton and Keighley Rockcliffe have extensive experience with STIS Ly a observations and analyses, including publications describing previous transit observations of young planets about similarly active stars. Dr George Zhou leads a TESS GI program to search for planets around young active stars, and is the lead author for the discovery paper describing the target of interest in this proposal. Dr Chelsea Huang leads the MIT TESS QLP pipeline, which has resulted in the discovery of thousands of planet candidates from TESS. She is an expert in space-based platforms, and will assist with the analysis of this program. Dr Laura Mayorga is an expert in the modeling and dynamics of exoplanet atmospheres. Prof Duncan Wright and Nataliea Lowson are experts in exoplanet atmosphere observations, and are key team members of the Twinkle space mission. Exoplanets and Exoplanet Formation 6 false false false false false false false false SUPPORTED STAR EXTRA-SOLAR PLANET G V-IV NO This object was generated by the targetselector and retrieved from the SIMBAD database. HIP94235 TIC464646604 J2000 J2000 STIS/FUV-MAMA Spectroscopic No No G140M 1222 The scheduling data was generated by CASM 30.3. 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CASM was run in Phase II mode. 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