Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.3601b&link_type=abstract
American Astronomical Society, ESS meeting #2, #36.01
Astronomy and Astrophysics
Astronomy
Scientific paper
Influences on planetary migration in 3D fully radiative discs
Recent studies have shown that low mass planets can migrate outwards in fully radiative discs at a distance of about 5 AU from the star. In order to sustain the outward migration of these planets, the disc has to meet certain criteria (temperature profile, entropy gradient, etc.). With increasing distance to the central star, the disc's temperature and density reduce. This reduction, however, has a dramatic effect on the torque acting on the planet (the torque determines the speed and direction of motion for planets on circular orbits). We find that for larger radi, the torque becomes negative and the planet would migrate inwards again. The planets therefore stop their outward migration at a point in the disc, while a planet moving inwards from further out stops its inward migration. This region in the disc can act as a feeding zone for planetary embryos.
The zero-torque radius for planets is dependent of the disc structure. The structure of our 3D fully radiative discs is determined by viscous heating and radiative transport/cooling to the surface. Therefore, the viscosity, the disc mass and the adiabatic index change the structure of the disc. A change in these parameters influences the zero-torque radius for low mass planets quite dramatically. I will present these changes in the disc structure for fully radiative discs and show the effect on the migration properties of planets in such discs.
Bitsch Bertram
Kley Willy
No associations
LandOfFree
Outward Migration in Radiative Discs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Outward Migration in Radiative Discs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Outward Migration in Radiative Discs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-833165