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Stellar CME activity and its possible influence on exoplanets' environments: Importance of magnetospheric protection

Published online by Cambridge University Press:  06 January 2014

Maxim L. Khodachenko ,
Yury Sasunov ,
Oleksiy V. Arkhypov ,
Igor I. Alexeev ,
Elena S. Belenkaya ,
Helmut Lammer ,
Kristina G. Kislyakova ,
Petra Odert ,
Martin Leitzinger  and
Manuel Güdel
Maxim L. Khodachenko
Affiliation:
Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria email: [email protected] Institute of Nuclear Physics, Moscow State University, 119992 Moscow, Russia
Yury Sasunov
Affiliation:
Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria email: [email protected]
Oleksiy V. Arkhypov
Affiliation:
Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria email: [email protected]
Igor I. Alexeev
Affiliation:
Institute of Nuclear Physics, Moscow State University, 119992 Moscow, Russia
Elena S. Belenkaya
Affiliation:
Institute of Nuclear Physics, Moscow State University, 119992 Moscow, Russia
Helmut Lammer
Affiliation:
Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria email: [email protected]
Kristina G. Kislyakova
Affiliation:
Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria email: [email protected]
Petra Odert
Affiliation:
Institute of Physics, Karl-Franzens-University, 8010 Graz, Austria
Martin Leitzinger
Affiliation:
Institute of Physics, Karl-Franzens-University, 8010 Graz, Austria
Manuel Güdel
Affiliation:
Institute of Astronomy, University of Vienna, 1180 Vienna, Austria
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Abstract

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CMEs are large-scale magnetized plasma structures carrying billions of tons of material that erupt from a star and propagate in the stellar heliosphere, interacting in multiple ways with the stellar wind. Due to the high speed, intrinsic magnetic field and the increased plasma density compared to the stellar wind background, CMEs can produce strong effects on planetary environments when they collide with a planet. The main planetary impact factors of CMEs, are associated interplanetary shocks, energetic particles accelerated in the shock regions, and the magnetic field disturbances. All these factors should be taken into account during the study of evolutionary processes on exoplanets and their atmospheric and plasma environments. CME activity of a star may vary depending on stellar age, stellar spectral type and the orbital distance of a planet. Because of relatively short range of propagation of majority of CMEs, they impact most strongly the magnetospheres and atmospheres of close orbit (< 0.1 AU) exoplanets.

Keywords

magnetic fieldsplasmasstars:planetary systemsstars:windsstars:activity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S300: Nature of Prominences and their role in Space Weather , June 2013 , pp. 335 - 346
Copyright
Copyright © International Astronomical Union 2013 

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