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Open AccessArticle

The Radiation Environment of Exoplanet Atmospheres

JILA, University of Colorado and NIST, Boulder, CO 80309, USA
Challenges 2014, 5(2), 351-373; https://doi.org/10.3390/challe5020351
Received: 15 August 2014 / Revised: 2 October 2014 / Accepted: 10 October 2014 / Published: 29 October 2014
(This article belongs to the Special Issue Challenges in Astrobiology)
Exoplanets are born and evolve in the radiation and particle environment created by their host star. The host star’s optical and infrared radiation heats the exoplanet’s lower atmosphere and surface, while the ultraviolet, extreme ultraviolet and X-radiation control the photochemistry and mass loss from the exoplanet’s upper atmosphere. Stellar radiation, especially at the shorter wavelengths, changes dramatically as a host star evolves leading to changes in the planet’s atmosphere and habitability. This paper reviews the present state of our knowledge concerning the time-dependent radiation emitted by stars with convective zones, that is stars with spectral types F, G, K, and M, which comprise nearly all of the host stars of detected exoplanets. View Full-Text
Keywords: exoplanets; stellar radiation; ultraviolet spectrum; exoplanet photochemistry; Lyman-alpha radiation; model chromospheres exoplanets; stellar radiation; ultraviolet spectrum; exoplanet photochemistry; Lyman-alpha radiation; model chromospheres
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Linsky, J.L. The Radiation Environment of Exoplanet Atmospheres. Challenges 2014, 5, 351-373.

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