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- W3121740744 endingPage "69" @default.
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- W3121740744 abstract "The Lyman-alpha emission line dominates the far-ultraviolet spectra of late-type stars and is a major source for photodissociation of important molecules including H2O, CH4, and CO2 in exoplanet atmospheres. The incident flux in this line illuminating an exoplanet's atmosphere cannot be measured directly as neutral hydrogen in the interstellar medium (ISM) attenuates most of the flux reaching the Earth. Reconstruction of the intrinsic Lyman-alpha line has been accomplished for a limited number of nearby stars, but is not feasible for distant or faint host stars. We identify correlations connecting the intrinsic Lyman-alpha flux with the flux in other emission lines formed in the stellar chromosphere, and find that these correlations depend only gradually on the flux in the other lines. These correlations, which are based on HST spectra, reconstructed Lyman-alpha line fluxes, and irradiance spectra of the quiet and active Sun, are required for photochemical models of exoplanet atmospheres when intrinsic Lyman-alpha fluxes are not available. We find a tight correlation of the intrinsic Lyman-alpha flux with stellar X-ray flux for F5 V to K5 V stars, but much larger dispersion for M stars. We also show that knowledge of the stellar effective temperature and rotation rate can provide reasonably accurate estimates of the Lyman-alpha flux for G and K stars, and less accurate estimates for cooler stars." @default.
- W3121740744 created "2021-02-01" @default.
- W3121740744 creator A5026684651 @default.
- W3121740744 creator A5083165380 @default.
- W3121740744 date "2013-03-08" @default.
- W3121740744 modified "2023-10-14" @default.
- W3121740744 title "COMPUTING INTRINSIC LYα FLUXES OF F5 V TO M5 V STARS" @default.
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- W3121740744 doi "https://doi.org/10.1088/0004-637x/766/2/69" @default.
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