Comparison between panchromatic spectra of early- and late-M stars

JEFFREY L. LINSKY; VIEYTES, MARIELA; TILIPMAN, DENNIS; KEVIN FRANCE

Seattle

Congreso; 233th AAS Meeting; 2019

American Astronomical Society

We have begun computing panchromatic spectra of M dwarfs that are known to host exoplanets. We are particularly interested in ultraviolet radiation that drives photochemical processes in exoplanet atmospheres. Here we present revised results on GJ 832, a relatively quiet M2 V dwarf, and a tentative model for GJ 876, an active M5 V dwarf. The model atmospheres are computed with the SSRPM radiative transfer code developed by Dr. Juan Fontenla. The code solves for the non-LTE statistical equilibrium populations of 18,538 levels of 52 atomic and ion species and computes the radiation from all species (435,986 spectral lines) and about 20,000,000 spectral lines of 20 diatomic species.