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Implications of stellar activity for exoplanetary atmospheres

Published online by Cambridge University Press:  19 August 2010

P. Odert ,
M. Leitzinger ,
A. Hanslmeier ,
H. Lammer ,
M.L. Khodachenko  and
I. Ribas
P. Odert*
Affiliation:
Institute of Physics/IGAM, University of Graz, Universitätsplatz 5, 8010 Graz, Austria
M. Leitzinger
Affiliation:
Institute of Physics/IGAM, University of Graz, Universitätsplatz 5, 8010 Graz, Austria
A. Hanslmeier
Affiliation:
Institute of Physics/IGAM, University of Graz, Universitätsplatz 5, 8010 Graz, Austria
H. Lammer
Affiliation:
Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, Austria
M.L. Khodachenko
Affiliation:
Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, Austria
I. Ribas
Affiliation:
Institut de Ciències de l'Espai (CSIC-IEEC), Facultat de Ciències, Torre C5, parell, 2a pl, Campus UAB, 08193 Bellaterra, Spain
*
e-mail: [email protected]
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Abstract

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.

Keywords

late-type starsplanet–star interactionsplanetary atmospheresstellar activity.
Type
Research Article
Information
International Journal of Astrobiology , Volume 9 , Special Issue 4: Special issue Papers from the Astrobiology Society of Britain Conference 2010 , October 2010 , pp. 239 - 243
Copyright
Copyright © Cambridge University Press 2010

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