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Quiescent and flaring lyman-α radiation of host stars and effects on exoplanets

Published online by Cambridge University Press:  09 September 2016

Jeffrey L. Linsky
JILA, University of Colorado and NIST, Boulder CO 80309-0440USA email:
Kevin France
LASP, University of Colorado, Boulder CO 80309-0600USA email:
Yamila Miguel
Laboratoire Lagrange, Observatoire de la Côte d'Azur, CNRS, Blvd de l'Observatoire, CS 3422, 06304 Nice cedex 4, France email:
Lisa Kaltenegger
Carl Sagan Institute, Cornell University, Ithaca NY 14853USA email:
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Lyman-α radiation dominates the ultraviolet spectra of G, K, and M stars and is a major photodissociation source for H2O, CO2, and CH4 in the upper atmospheres of exoplanets. We obtain intrinsic Lyman-α line fluxes for late-type stars by correcting for interstellar absorption or by scaling from other spectroscopic observables. When stars flare, all emission lines brighten by large factors as shown by HST spectra. We describe photochemical models of the atmosphere of the mini-Neptune GJ 436b (Miguel et al. 2015) that show the effects of flaring Lyman-α fluxes on atmospheric chemical abundances.

Contributed Papers
Copyright © International Astronomical Union 2016 


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