v1 3707 Assigned ID: 3425 ----- Attempting Submission 1 (Fri Mar 25 19:06:31 GMT 2022) ----- The extreme ultraviolet (EUV) emission from stars is the dominant source of heating to the upper atmospheres of planets and drives atmospheric escape, but this wavelength regime is unobserved for most exoplanet host stars. The differential emission measure technique is a method to infer the EUV emission of stars using FUV emission lines and X-ray fluxes as inputs. This method can function in the limits of low precision data with appropriately propagated uncertainties and can be effectively applied to a large ensemble of stars. We will use archival Hubble STIS/COS data of 115 GKM dwarfs, supplemented by archival X-ray data, to infer these stars' EUV spectra using the differential emission measure technique. The selected sample spans a wide range of stellar masses and ages encompassing a parameter space that includes the vast majority of exoplanet hosts. The EUV spectral library of this sample will be published in an easy-to-use format for the broader exoplanet community to use as inputs for models of planetary atmosphere formation and evolution and to study the present-day EUV irradiation of known exoplanets. To make statistically and scientifically rigorous claims about the relationship between EUV emission of planet hosts and the properties of their planetary systems we need population-wide EUV estimates with well-characterized uncertainties. This proposal makes use of the Hubble archive to provide homogeneously determined EUV spectra, enabling comparative studies of exoplanets formation, evolution, and habitability. The PI, Girish M. Duvvuri, is a graduate student with experience using the differential emission measure technique to estimate the EUV spectra of main-sequence stars, experience analyzing Hubble STIS/COS spectra, Chandra ACIS-S data, and XMM-Newton RGS/EPIC-PN/EPIC-MOS data. Co-I Dr. J. Sebastian Pineda has experience with UV spectroscopy,characterizing low-mass stars, studying stellar magnetic activity, and is one the PIs PhD thesis advisors. Co-I Professor Zachory K. Berta-Thompson has experience with UV spectroscopy, characterizing low mass stars, exoplanet atmospheres, and is one of the PIs PhD thesis advisors. Co-Is Dr. Allison Youngblood and Professor Kevin France have experience working with Hubble STIS/COS spectra, characterizing low mass stars, and EUV spectroscopy. Exoplanets and Exoplanet Formation Stellar Physics and Stellar Types 0 Regular false false true false false false SUPPORTED