0 Assigned ID: 5831 ----- Attempting Submission 1 (Tue Mar 26 23:29:12 GMT 2024) ----- HST Phase I Proposal 5831 successfully submitted. Receipt: # 5831-1 ----- Attempting Submission 2 (Tue Mar 26 23:44:26 GMT 2024) ----- HST Phase I Proposal 5831 successfully submitted. Receipt: # 5831-2 ----- Attempting Submission 3 (Tue Mar 26 23:49:55 GMT 2024) ----- We propose to use ultraviolet spectra from Hubble Space Telescope's Cosmic Origins Spectrograph (HST-COS) to characterize molecular hydrogen (H2) winds in the protoplanetary disks of a large sample of T Tauri stars for the first time. We will also use the growing archive of spatially-resolved James Webb Space Telescope (JWST) data to quantify mid-infrared H2 and [Ne II] emission in T Tauri stars common to our HST-COS sample. From the HST-COS data, we will measure H2 line kinematics and estimate molecular wind mass loss. We will compare the measured line kinematics to star and disk parameters (e.g., mass accretion rate and the infrared index), and to line kinematics measured from existing molecular and atomic tracers of the disk wind. From the JWST data, we will measure H2 and [Ne II] line kinematics, and the spatial extent of the wind. We aim to determine the physical launching mechanism of the wind (magnetohydrodynamic or photoevaporative) throughout the lifetime of the disk, and the degree to which atomic and molecular disk gas tracers probe different parts of the outflow. Together, these analyses will provide a new panchromatic framework for interpreting protoplanetary disk winds, a key input to the evolution and dispersal of the disk. PI Matt Kalscheur led development of the MCMC pipeline to be used in this analysis. He is familiar with HST-COS data and analysis procedures, and has co-authored a paper on substructure in protoplanetary disks (Zhang et al. 2023). He has also worked on analysis of Sun-as-a-star spectral line profiles and identification of gravitationally lensed submm galaxies. Co-I Kevin France is the PI of the HST MUSCLES Treasury Survey (GO13650) and MEATS (GO16166) Survey to study the UV and X-ray spectral and temporal properties of exoplanet host stars (France et al. 2016, 2018, 2020; Loyd et al. 2016; Youngblood et al. 2016; Behr et al. 2023 - in press). He is the co-PI of the follow-on Mega-MUSCLES (GO15071) and Mega-MEATS (16701) Surveys that focused on activity in stars optimal for planetary characterization with JWST. He was a member of the COS instrument and science teams; he is intimately familiar with HST-COS and -STIS instrument, data, and analysis procedures. His research group has developed numerous community tools for spectral and temporal analysis of HST and X-ray observatory observations of cool stars. Dr France has authored over 100 refereed publications on exoplanets, cool stars, and planet-forming disks using UV spectra from HST. Exoplanets and Exoplanet Formation Stellar Physics and Stellar Types 0 false false true false false false false SUPPORTED