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The UV/X-ray radiation fields and particle (CME) flows of M dwarf exoplanet host stars

Published online by Cambridge University Press:  24 September 2020

Alexander Brown Open the ORCID record for Alexander Brown [Opens in a new window]
Alexander Brown*
Affiliation:
Center for Astrophysics and Space Astronomy, 389 UCB, University of Colorado, Boulder, CO80309-0389, USA email: alexander.brown@colorado.edu
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Abstract

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The high energy X-ray and UV radiation fields of host stars play a crucial role in determining the atmospheric conditions and habitability of potentially-habitable exoplanets. This paper focuses on the major surveys of the UV/X-ray emissions of M- and K-type exoplanet hosts that have been undertaken by the MUSCLES and MegaMUSCLES Hubble Space Telescope (HST) Treasury programs and associated contemporaneous X-ray and ground-based observations. The quiescent and flaring radiation (both photons and implied particles) were observed from this extensive sample of relatively old, low mass, exoplanet host stars and show that, from the viewpoint of a habitable-zone exoplanet, there is no such thing as an “inactive” M dwarf star. The resulting implications are significant for planetary habitability. Extensive monitoring of the X-ray/UV emission from a representative younger M dwarf is also presented and the direct stellar effects that influence exoplanets during the earlier phases of their formation and evolution discussed.

Keywords

stars: late-typestars: activitystars: flare, planetary systemsX-rays: starsultraviolet: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 377 - 383
Copyright
© International Astronomical Union 2020

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