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Application of recent results on the orbital migration of low mass planets: convergence zones

Published online by Cambridge University Press:  10 November 2011

Christoph Mordasini ,
Kai-Martin Dittkrist ,
Yann Alibert ,
Hubert Klahr ,
Willy Benz  and
Thomas Henning
Christoph Mordasini
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: mordasini@mpia.de
Kai-Martin Dittkrist
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: mordasini@mpia.de
Yann Alibert
Affiliation:
Physikalisches Institut, Sidlerstrasse 5, CH-3012 Bern, Switzerland
Hubert Klahr
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: mordasini@mpia.de
Willy Benz
Affiliation:
Physikalisches Institut, Sidlerstrasse 5, CH-3012 Bern, Switzerland
Thomas Henning
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: mordasini@mpia.de
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Abstract

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Previous models of the combined growth and migration of protoplanets needed large ad hoc reduction factors for the type I migration rate as found in the isothermal approximation. In order to eliminate these factors, a simple semi-analytical model is presented that incorporates recent results on the migration of low mass planets in non-isothermal disks. It allows for outward migration. The model is used to conduct planetary populations synthesis calculations. Two points with zero torque are found in the disks. Planets migrate both in- and outward towards these convergence zones. They could be important for accelerating planetary growth by concentrating matter in one point. We also find that the updated type I migration models allow the formation of both close-in low mass planets, but also of giant planets at large semimajor axes. The problem of too rapid migration is significantly mitigated.

Keywords

planetary systems: formationplanetary systems: protoplanetary disks
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. 72 - 75
Copyright
Copyright © International Astronomical Union 2011

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