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Climate of Eccentric Terrestrial Planets with Carbonate-Silicate Geochemical Cycle

Published online by Cambridge University Press:  29 April 2014

Shintaro Kadoya ,
Eiichi Tajika  and
Yoshiyasu Watanabe
Shintaro Kadoya
Affiliation:
Department of Earth & Planetary Science, University of Tokyo, Kiban bldg. 408, 5-1-5, Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan email: kadoya@astrobio.k.u-tokyo.ac.jp
Eiichi Tajika
Affiliation:
Department of Complecity Science & Engineering, University of Tokyo, Kiban bldg. 409, 5-1-5, Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan email: tajika@k.u-tokyo.ac.jp
Yoshiyasu Watanabe
Affiliation:
Department of Earth & Planetary Science, University of Tokyo, Kiban bldg. 408, 5-1-5, Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan email: y-watanabe@astrobio.k.u-tokyo.ac.jp
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Abstract

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Recent discovery of extrasolar planets indicates that some of them have much higher eccentricity than the planets in the solar system. Here, we investigate the climate of such eccentric terrestrial planets with oceans and carbonate-silicate geochemical cycles. We find that the climate of the planets are dependent on the annual mean insolation as shown in previous works. We also find that the planets orbiting slightly further from our Sun than the Earth are globally ice-covered even if the carbonate-silicate geochemical cycle works under the same CO2 degassing rate as on the present Earth. However, when the CO2 degassing rate is higher, the planets avoid being globally ice-covered owing to the high level.

Keywords

terrestrial planets - atmosphereexoplanet atmospherehabitability
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S293: Formation, Detection, and Characterization of Extrasolar Habitable Planets , August 2012 , pp. 319 - 322
Copyright
Copyright © International Astronomical Union 2014 

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