The ultraviolet radiation environment in the habitable zones around low-mass exoplanet host stars

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• 作者：Kevin France (1)
  Jeffrey L. Linsky (2)
  R. O. Parke Loyd (1)
  
• 关键词：Extrasolar planet ; Ultraviolet radiation ; Habitable zone ; Ozone
• 刊名：Astrophysics and Space Science
• 出版年：2014
• 出版时间：November 2014
• 年：2014
• 卷：354
• 期：1
• 页码：3-7
• 全文大小：1,329 KB
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  14. Linsky,
• 作者单位：Kevin France (1)
  Jeffrey L. Linsky (2)
  R. O. Parke Loyd (1)
  
  1. Center for Astrophysics and Space Astronomy, University of Colorado Boulder, 389 UCB, 80309, Boulder, USA
  2. JILA and NIST, University of Colorado Boulder, 440 UCB, 80309, Boulder, USA
  
• ISSN：1572-946X

文摘

The EUV (200-11 ?), FUV (912-750 ?), and NUV (1750-200 ?) spectral energy distribution of exoplanet host stars has a profound influence on the atmospheres of Earth-like planets in the habitable zone. The stellar EUV radiation drives atmospheric heating, while the FUV (in particular, Lyα) and NUV radiation fields regulate the atmospheric chemistry: the dissociation of H2O and CO2, the production of O2 and O3, and may determine the ultimate habitability of these worlds. Despite the importance of this information for atmospheric modeling of exoplanetary systems, the EUV/FUV/NUV radiation fields of cool (K and M dwarf) exoplanet host stars are almost completely unconstrained by observation or theory. We present observational results from a Hubble Space Telescope survey of M dwarf exoplanet host stars, highlighting the importance of realistic UV radiation fields for the formation of potential biomarker molecules, O2 and O3. We conclude by describing preliminary results on the characterization of the UV time variability of these sources.