Implications of stellar activity for exoplanetary atmospheres

Details Implications of stellar activity for exoplanetary atmospheres Implications of stellar activity for exoplanetary atmospheres

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ijasb...9..239o&link_type=abstract

Special issue Papers from the Astrobiology Society of Britain Conference 2010, Volume 9, Issue 4, p. 239-243

Biology

Late-Type Stars, Planet–Star Interactions, Planetary Atmospheres, Stellar Activity.

Scientific paper

Stellar X-ray and extreme ultraviolet (XUV) radiation is an important driver of the escape of planetary atmospheres. Young stars emit high XUV fluxes that decrease as they age. Since the XUV emission of a young star can be orders of magnitude higher compared to an older one, this evolution has to be taken into account when studying the mass-loss history of a planet. The temporal decrease of activity is closely related to the operating magnetic dynamo, which depends on rotation and convection in Sun-like stars. Using a sample of nearby M dwarfs, we study the relations between age, rotation and activity and discuss the influence on planets orbiting these low-mass stars.

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