Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2009-10-06
Astrophysical Journal Letters 705 (2009) L148-L152
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
6 pages, 4 figures, accepted for publication by ApJ Letters
Scientific paper
10.1088/0004-637X/705/2/L148
Recent observations of exoplanets by direct imaging, reveal that giant planets orbit at a few dozens to more than a hundred of AU from their central star. The question of the origin of these planets challenges the standard theories of planet formation. We propose a new way of obtaining such far planets, by outward migration of a pair of planets formed in the 10 AU region. Two giant planets in mean motion resonance in a common gap in the protoplanetary disk migrate outwards, if the inner one is significantly more massive than the outer one. Using hydrodynamical simulations, we show that their semi major axes can increase by almost one order of magnitude. In a flared disk, the pair of planets should reach an asymptotic radius. This mechanism could account for the presence of Fomalhaut b ; then, a second, more massive planet, should be orbiting Fomalhaut at about 75 AU.
Crida Aurelien
Masset Frédéric
Morbidelli Alessandro
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