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Catalogue POP – Notice individuelle de publication

Lammer Helmut, Lichtenegger Herbert I. M., Kulikov Yuri N., Grießmeier Jean-Mathias, Terada N., Erkaev Nikolai V., Biernat Helfried K., Khodachenko Maxim L., Ribas Ignasi, Penz Thomas, Selsis Franck

Coronal Mass Ejection (CME) Activity of Low Mass M Stars as An Important Factor for The Habitability of Terrestrial Exoplanets. II. CME-Induced Ion Pick Up of Earth-like Exoplanets in Close-In Habitable Zones

Astrobiology, 2007, vol. 7, pp. 185-207

Référence DOI : 10.1089/ast.2006.0128
Référence ADS : 2007AsBio...7..185L

Résumé :

Atmospheric erosion of CO<SUB>2</SUB> -rich Earth-size exoplanets due to coronal mass ejection (CME)-induced ion pick up within close-in habitable zones of active M-type dwarf stars is investigated. Since M stars are active at the X-ray and extreme ultraviolet radiation (XUV) wave-lengths over long periods of time, we have applied a thermal balance model at various XUV flux input values for simulating the thermospheric heating by photodissociation and ionization processes due to exothermic chemical reactions and cooling by the CO<SUB>2</SUB> infrared radiation in the 15 mum band. Our study shows that intense XUV radiation of active M stars results in atmospheric expansion and extended exospheres. Using thermospheric neutral and ion densities calculated for various XUV fluxes, we applied a numerical test particle model for simulation of atmospheric ion pick up loss from an extended exosphere arising from its interaction with expected minimum and maximum CME plasma flows. Our results indicate that the Earth-like exoplanets that have no, or weak, magnetic moments may lose tens to hundreds of bars of atmospheric pressure, or even their whole atmospheres due to the CME-induced O ion pick up at orbital distances

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