Atmospheric Escape from Highly Irradiated Planets

Details Atmospheric Escape from Highly Irradiated Planets Atmospheric Escape from Highly Irradiated Planets

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340309m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #403.09; Bulletin of the American Astronomical Society, Vol. 41, p.195

Astronomy and Astrophysics

Astronomy

Scientific paper

About 1 in 5 of the more than 200 extrasolar planets observed to date are located less than 0.1 AU from their host stars. Observations of HD 209458b, the first highly irradiated "hot Jupiter" discovered on an orbit transiting its host star, suggest that the planet may be losing atomic hydrogen. Photoionization heating from stellar UV radiation can drive planetary mass loss in the form of hydrodynamic winds. I will demonstrate that Jupiter-mass planets at 0.05 AU lose at most 1% of their mass over the main sequence lifetimes of their host stars. I will discuss the stability of hydrogen atmospheres on highly irradiated planets as a function of planetary mass, stellocentric distance, and the age and type of the host star.

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