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Making systems of Super Earths by inward migration of planetary embryos

Published online by Cambridge University Press:  06 January 2014

Christophe Cossou ,
Sean N. Raymond  and
Arnaud Pierens
Christophe Cossou
Affiliation:
Univ. Bordeaux, LAB, UMR 5804, F-33270, Floirac, France. CNRS, LAB, UMR 5804, F-33270, Floirac, France
Sean N. Raymond
Affiliation:
Univ. Bordeaux, LAB, UMR 5804, F-33270, Floirac, France. CNRS, LAB, UMR 5804, F-33270, Floirac, France
Arnaud Pierens
Affiliation:
Univ. Bordeaux, LAB, UMR 5804, F-33270, Floirac, France. CNRS, LAB, UMR 5804, F-33270, Floirac, France
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Abstract

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Using N-body simulations with planet-disk interactions, we present a mechanism capable of forming compact systems of hot super Earths such as Kepler 11. Recent studies show that outward migration is common in the inner parts of radiative disks. However we show that two processes naturally tip the balance in favor of inward migration. First the corotation torque is too weak to generate outward migration for planetary embryos less massive than 4M⊕. Second, system of multiple embryos generate sustained non-zero eccentricities that damp the corotation torque and again favor inward migration. Migration and accretion of planetary embryos in realistic disks naturally produce super Earths in resonant chains near the disk inner edge. Their compact configuration is similar to the observed systems.

Keywords

Planets and satellites: formationProtoplanetary disksPlanet-disk interactionsplanetary systemsMethods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S299: Exploring the Formation and Evolution of Planetary Systems , June 2013 , pp. 360 - 364
Copyright
Copyright © International Astronomical Union 2013 

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