Long range outward migration of giant planets, with application to Fomalhaut b - Astrophysics > Earth and Planetary AstrophysicsReport as inadecuate




Long range outward migration of giant planets, with application to Fomalhaut b - Astrophysics > Earth and Planetary Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Recent observations of exoplanets by direct imaging, reveal that giantplanets orbit at a few dozens to more than a hundred of AU from their centralstar. The question of the origin of these planets challenges the standardtheories of planet formation. We propose a new way of obtaining such farplanets, 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 theprotoplanetary disk migrate outwards, if the inner one is significantly moremassive than the outer one. Using hydrodynamical simulations, we show thattheir semi major axes can increase by almost one order of magnitude. In aflared disk, the pair of planets should reach an asymptotic radius. Thismechanism could account for the presence of Fomalhaut b ; then, a second, moremassive planet, should be orbiting Fomalhaut at about 75 AU.



Author: A. Crida, F. Masset, A. Morbidelli

Source: https://arxiv.org/







Related documents