Journal Article

Numerical simulations of type III planetary migration – III. Outward migration of massive planets

A. Pepliński, P. Artymowicz and G. Mellema

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 387, issue 3, pages 1063-1079
Published in print July 2008 | ISSN: 0035-8711
Published online May 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13339.x
Numerical simulations of type III planetary migration – III. Outward migration of massive planets

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We present a numerical study of rapid, so-called type III migration for Jupiter-sized planets embedded in a protoplanetary disc. We limit ourselves to the case of outward migration, and study in detail its evolution and physics, concentrating on the structure of the corotation and circumplanetary regions, and processes for stopping migration. We also consider the dependence of the migration behaviour on several key parameters. We perform this study using global, two-dimensional hydrodynamical simulations with adaptive mesh refinement. We find that the outward-directed type III migration can be started if the initial conditions support the initial average non-dimensional migration rate bigger than one. Unlike the inward-directed migration, in the outward migration the migration rate increases due to the growing of the volume of the co-orbital region. We find the migration to be strongly dependent on the rate of the mass accumulation in the circumplanetary disc, leading to two possible regimes of migration, fast and slow. The structure of the co-orbital region and the stopping mechanism differs between these two regimes.

Keywords: accretion, accretion discs; hydrodynamics; methods: numerical; planets and satellites: formation

Journal Article.  11210 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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