Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.2719j&link_type=abstract
American Astronomical Society, DPS meeting #42, #27.19; Bulletin of the American Astronomical Society, Vol. 42, p.1063
Astronomy and Astrophysics
Astronomy
Scientific paper
As embryonic planets grow in size, they begin to clear gaps in the protoplanetary disks in which they form. Cooling in the shadow of the gap creates a distinct thermal signature which can affect the continuing growth and migration of the planet. I examine the thermal effects in disks with gaps using detailed self-consistent radiative transfer models for the disks. Shadowing and illumination on the gap alters the radial temperature profile of the disk, which alters the locations of Lindblad resonances, which are offset from Keplerian rotation because of pressure support. This, in turn alters the relative strengths of the torques, and can shift the overall balance of Type I migration torques. In some cases, the radial temperature profiles is sufficiently altered to reverse the direction of Type I migration, resulting in the outward rather than inward migration of planets. This mechanism may rescue planets from rapid inward migration and loss of the planet onto the star, or could send Jovian-mass planets to large distances from their stars, as in the HR 8799 and Fomalhaut systems.
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