Jena 2013 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 6: Astrobiologie/Erdnaher Weltraum
EP 6.2: Talk
Wednesday, February 27, 2013, 14:30–14:45, HS 9
3D climate modeling of Earth-like extrasolar planets orbiting different types of central stars — •Mareike Godolt1,2, John Lee Grenfell1, Markus Kunze3, Ulrike Langematz3, A. Beate C. Patzer1, and Heike Rauer1,2 — 1Zentrum für Astronomie und Astrophysik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin — 2Institut für Planetenforschung, Deutsches Zentrum für Luft- und Raumfahrt, Rutherfordstr. 2,12489 Berlin — 3Institut für Meteorologie, Freie Universität Berlin, Carl-Heinrich-Becker-Weg 6-10 12165 Berlin
The habitability of a terrestrial planet is usually defined by the existence of liquid water on the surface. The potential presence of liquid water on a planetary surface depends e.g. on surface temperatures. These are determined by various climate processes and their interaction with the radiative energy provided by the planet's host star. To evaluate the influence of three-dimensional (3D) and dynamical atmospheric processes a state-of-the-art Earth climate model has been adapted and applied to Earth-like extrasolar planets orbiting different types of central stars which receive the same amount of total energy. All planetary scenarios studied result in habitable surface conditions. For the planet around the F-type star lower surface temperatures lead to an increase in surface albedo increases due to the build-up of sea ice. For the planet around the K-type star temperatures increase yielding a massive build-up of water vapor and clouds in the atmosphere. The 3D model results are compared to those of a cloud-free one-dimensional radiative-convective climate model.