Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..130k&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.130
Physics
Scientific paper
Different scenarios of the early Earth-type hydrogenrich upper atmospheres and their expected evolution are discussed. Due to the higher EUV flux of the young Sun/stars exoplanets should experience nonhydrostatic states which manifest in an expansion of the dynamically outward flowing upper atmosphere. Outward flowing neutral atoms can interact with the stellar plasma flow. We show that extended hydrogen coronae and/or energetic neutral atoms (ENA) will be produced via charge exchange processes with the stellar wind. Finally we estimate the non-thermal ion loss rate and stellar wind erosion of the hydrogen envelopes.
Hanslmeier Arnold
Holmström Mats
Khodachenko Maxim L.
Kislyakova K. G.
Kulikov Yu. N.
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