Stuttgart 2012 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 3: Astrobiologie

EP 3.3: Vortrag

Dienstag, 13. März 2012, 14:45–15:00, V55.02

Photochemistry of Potential Biosignatures in Super-Earth Atmospheres — •John Lee Grenfell¹, Stefanie Gebauer¹, Karol Palczynski^1,2, Heike Rauer^1,3, Ralph Lehmann⁴, Joachim Stock³, Philip von Paris^5,6, Mareike Godolt¹, and Franck Selsis^5,6 — ¹Zentrum für Astronomie und Astrophysik, Berlin, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany — ³Institut für Planetenforschung, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Berlin, Germany — ⁴Alfred-Wegener Institut für Polar- und Meeresforschung, Potsdam, Germany — ⁵Univ Bordeaux, LAB, Floirac, France — ⁶CNRS, LAB, Floirac, France

The characterisation via spectra of Super-Earth atmospheres for planets orbiting in the Habitable Zone of M-stars is a central theme in exoplanet science. A challenge is to understand the expected spectral signals of atmospheric biomarkers (species associated with life). In this contribution we apply a global-mean coupled climate-photochemical column model assuming a planet with an Earth-like biomass and planetary development orbiting in the Habitable Zone. We perform runs with planetary gravity of 1g and 3g changing the spectral classes of the central star from M0 to M7. In a companion paper, Rauer et al. (2011) analysed the spectral signals of the planetary scenarios. In this work we present a deeper analysis of the chemical processes involved.