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TwitterA&A 487, L9-L12 (2008)
DOI: 10.1051/0004-6361:200810033
Letter
Migration of protoplanets in radiative discs
W. Kley and A. CridaInstitut für Astronomie & Astrophysik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
e-mail: wilhelm.kley@uni-tuebingen.de
Received 23 April 2008 / Accepted 18 June 2008
Abstract
Context. In isothermal discs, the migration of protoplanets is directed
inwards. For small planetary masses, the standard type I migration
rates are so high that this can result in an unrealistic loss of
planets into the stars.
Aims. We investigate the planet-disc interaction in non-isothermal discs
and analyse the magnitude and direction of migration for an extended
range of planet masses.
Methods. We performed detailed two-dimensional numerical simulations of
embedded planets including heating/cooling effects as well as
radiative diffusion for realistic opacities.
Results. In radiative discs, small planets with
migrate outwards at a rate comparable to the absolute
magnitude of standard type I migration. For larger masses, the
migration is inwards and approaches the isothermal, type II migration rate.
Conclusions. Our findings are particularly important for the first growth phase of
planets and ease the problem of too rapid inward type I migration.
Key words: stars: planetary systems: formation -- accretion, accretion disks
© ESO 2008