090431

Newly-discovered exoplanets from TESS provide the opportunity to assess therelative importance of atmospheric escape mechanisms proposed to explain thebimodal distribution of super-Earths and mini-Neptunes discovered with Kepler.We will measure X-ray spectra and fluxes of the host stars of a sample of TESSplanets as inputs to models comparing XUV-driven photoevaporation withcore-powered mass loss. Determining the relative importance of these mechanismsis important for studies of exoplanet habitability particularly around M-dwarfswhere the cumulative XUV irradiation in the habitable zone is much higher. [truncated! Please see actual data for full text]