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Understanding exoplanet formation, structure and evolution in 2010

Published online by Cambridge University Press:  10 November 2011

Gilles Chabrier ,
Jérémy Leconte  and
Isabelle Baraffe
Gilles Chabrier
Affiliation:
École Normale Supérieure de Lyon, CRAL (CNRS, UMR 5574), F-69364 Lyon cedex 07, France Physics & Astronomy, University of Exeter, Exeter EX4 4PE, UK ([email protected], [email protected], [email protected])
Jérémy Leconte
Affiliation:
École Normale Supérieure de Lyon, CRAL (CNRS, UMR 5574), F-69364 Lyon cedex 07, France
Isabelle Baraffe
Affiliation:
École Normale Supérieure de Lyon, CRAL (CNRS, UMR 5574), F-69364 Lyon cedex 07, France Physics & Astronomy, University of Exeter, Exeter EX4 4PE, UK ([email protected], [email protected], [email protected])
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Abstract

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In this short review, we summarize our present understanding (and non-understanding) of exoplanet formation, structure and evolution, in the light of the most recent discoveries. Recent observations of transiting massive brown dwarfs seem to remarkably confirm the predicted theoretical mass-radius relationship in this domain. This mass-radius relationship provides, in some cases, a powerful diagnostic to distinguish planets from brown dwarfs of same mass, as for instance for Hat-P-20b. If confirmed, this latter observation shows that planet formation takes place up to at least 8 Jupiter masses. Conversely, observations of brown dwarfs down to a few Jupiter masses in young, low-extinction clusters strongly suggests an overlapping mass domain between (massive) planets and (low-mass) brown dwarfs, i.e. no mass edge between these two distinct (in terms of formation mechanism) populations. At last, the large fraction of heavy material inferred for many of the transiting planets confirms the core-accretion scenario as been the dominant one for planet formation.

Keywords

planets and satellites: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S276: The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution , October 2010 , pp. 171 - 180
Copyright
Copyright © International Astronomical Union 2011

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