Computing Intrinsic Lyman-alpha Fluxes of F5 V to M5 V Stars
作者： Jeffrey L. Linsky , Kevin France , Tom Ayres
DOI: 10.1088/0004-637X/766/2/69
关键词: Emission spectrum 、 Astrophysics 、 Exoplanet 、 Chromosphere 、 Interstellar medium 、 Physics 、 Effective temperature 、 Line (formation) 、 Stars 、 Spectral line
摘要: The Lyman-alpha emission line dominates the far-ultraviolet spectra of late-type stars and is a major source for photodissociation important molecules including H2O, CH4, CO2 in exoplanet atmospheres. incident flux this illuminating an exoplanet's atmosphere cannot be measured directly as neutral hydrogen interstellar medium (ISM) attenuates most reaching Earth. Reconstruction intrinsic has been accomplished limited number nearby stars, but not feasible distant or faint host stars. We identify correlations connecting with other lines formed stellar chromosphere, find that these depend only gradually on lines. These correlations, which are based HST spectra, reconstructed fluxes, irradiance quiet active Sun, required photochemical models atmospheres when fluxes available. tight correlation X-ray F5 V to K5 much larger dispersion M also show knowledge effective temperature rotation rate can provide reasonably accurate estimates G K less cooler
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