Formation, tidal evolution and habitability of the Kepler-186 system

Emeline Bolmont 1 Sean N. Raymond 1 P. Von Paris Franck Selsis 1 F. Hersant 2 Elisa V. Quintana Thomas Barclay
1 SSE 2014
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
2 FORMATION STELLAIRE 2014
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : The Kepler-186 system consists of five planets orbiting an early-M dwarf. The planets have physical radii of 1.0-1.50 R$_\oplus$ and orbital periods of 4 to 130 days. The $1.1~$R$_\oplus$ Kepler-186f with a period of 130 days is of particular interest. Its insolation of roughly $0.32~S_\odot$places it within the liquid water habitable zone. We present a multi-faceted study of the Kepler-186 system. First, we show that the distribution of planet masses can be roughly reproduced if the planets accreted from a high-surface density disk presumably sculpted by an earlier phase of migration. However, our simulations predict the existence of 1-2 undetected planets between planets e and f. Next, we present a dynamical analysis of the system including the effect of tides. The timescale for tidal evolution is short enough that the four inner planets must have small obliquities and near-synchronous rotation rates. Tidal evolution of Kepler-186f is slow enough that its current spin state depends on a combination of its dissipation rate and the stellar age. Finally, we study the habitability of Kepler-186f with a 1-D climate model. The planet's surface temperature can be raised above 273 K with 0.5-5 bars of CO$_2$, depending on the amount of N$_2$ present. Kepler-186f represents a case study of an Earth-sized planet in the cooler regions of the habitable zone of a cool star.
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https://hal.archives-ouvertes.fr/hal-00981324
Contributeur : Marie-Paule Pomies <>
Soumis le : mardi 22 avril 2014 - 07:44:34
Dernière modification le : mercredi 27 juillet 2016 - 14:48:48

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Emeline Bolmont, Sean N. Raymond, P. Von Paris, Franck Selsis, F. Hersant, et al.. Formation, tidal evolution and habitability of the Kepler-186 system. Astrophysical Journal, American Astronomical Society, 2014, 793 (1), pp.id. 3. <10.1088/0004-637X/793/1/3>. <hal-00981324>

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