Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..221f&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astrophysics
Scientific paper
About 20% of the extrasolar planets detected fo far have an orbital radius in the range 0.038-0.1 astronomical unit. However, it is likely that these planets have formed at larger distances from their host star. Tidal interaction with the disk in which they were embedded has probably led them to migrate toward the disk center. In this context, there has to be a mechanism to prevent a migrating planet from falling onto the central star. A recent analytical study has shown that the presence of a magnetic field can slow down, halt or reverse the migration of terrestrial mass planets. Here I present 2D numerical simulations of planet migration in a magnetized disk. The results confirm the existence of magnetic resonances near the planet which modify the torque exerted by the disk on the planet. It is shown that, when the magnetic field decreases fast enough with radius, the planet migrates outward.
Fromang Sebastien
Terquem Caroline
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