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Paper: Liquid Water on Frozen Extrasolar Planets?
Volume: 398, Extreme Solar Systems
Page: 537
Authors: Ehrenreich, D.; Lecavelier des Etangs, A.; Beaulieu, J.; Grasset, O.
Abstract: The detection of OGLE-2005-BLG-390Lb (Beaulieu et al. 2006) around an M star in the Galactic Bulge unveils the existence of cold (∼ 40 K) Earth-mass planets (Ehrenreich and Cassan 2007). Such planets could nevertheless host liquid water beneath a frozen surface, because of a strong radiogenic heating of the ice shell (Ehrenreich et al. 2006). Heating and cooling of the ice shell depend on the ice-to-rock ratio (I/R) and the age of the planet planet. OGLE 390Lb now seems too old (∼ 10 Gyr) to host a subsurface ocean, for any tested I/R value. However, the heat production rate was larger in the past so that liquid water did flow for several billions of years underneath the ice shell.
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