0Assigned ID: 1268
----- Attempting Submission 1 (Fri Sep 30 18:26:40 GMT 2016) -----
HST Phase I Proposal 1268 (MidCycleProposal_USco1610_Cycle24.pdf.apt) successfully submitted.
Receipt: # 1268-1
----- Attempting Submission 2 (Fri Sep 30 19:45:27 GMT 2016) -----
HST Phase I Proposal 1268 (MidCycleProposal_USco1610_Cycle24.pdf.apt) successfully submitted.
Receipt: # 1268-2
----- Attempting Submission 3 (Fri Sep 30 22:46:40 GMT 2016) -----
HST Phase I Proposal 1268 (MidCycleProposal_USco1610_Cycle24.pdf.apt) successfully submitted.
Receipt: # 1268-3
----- Attempting Submission 4 (Fri Sep 30 22:56:33 GMT 2016) -----0----- Attempting Submission 1 (Mon Dec 19 19:48:34 GMT 2016) -----
----- Attempting Submission 2 (Mon Jan 16 05:52:42 GMT 2017) -----
----- Attempting Submission 3 (Thu May 04 16:16:42 GMT 2017) -----Spectroscopic Characterization of a Newborn Neptune-Sized PlanetThe study of planet formation as it occurs has remained an elusive frontier, until now. Our team recently identified a newly-born planet orbiting a young, 5-10 Myr old, pre-main-sequence M star in the Upper Scorpius star-forming region. In its early stage, the close-in planet is about 50% larger than Neptune. Models predict that it will contract over the coming 100-1000 Myr to become a member of the intriguingly abundant class of close-in sub-Neptunes. Spectroscopic observations of this newborn planet will give us the unprecedented opportunity to probe the formation and evolution of low-mass, close-in planets at this early stage. Here, we propose to a reconnaissance study to probe the adolescent state of the gravitationally-bound atmosphere using near-infrared transit spectroscopy and the planet's hydrogen loss rate using far-UV transit spectroscopy. Together, our observations will give us unparalleled insights into the initial state of a young close-in planet as well as into the competing timescales of Kelvin-Helmholtz contraction and envelope mass-loss involved in the early evolution of close-in sub-Neptunes and Neptunes. If the proposed reconnaissance observations detect that molecular absorption in the atmosphere of USco 1610-1919b, then USco 1610-1919b will be one of the prime targets for the 200-hour JWST/NIRISS GTO program to probe the formation and evolution of exoplanets. Mid-cycle observations are required because the final target list for JWST/GTO programs must be locked in by June 2017 before the beginning of HST Cycle 25.The program consists of one WFC3/G141 transit visit and four individual UV orbits of the young exoplanet USco-1610-1919.
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