Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dda....39.0302m&link_type=abstract
American Astronomical Society, DDA meeting #39, #3.02
Physics
Scientific paper
We present a parametric study of giant planet migration through the combined action of disk torques and planet-planet scattering. Disk torques exerted on planets are divided into: Type II migration effects, which readily decrease semi-major axes and orbital eccentricities, and turbulent effects, which induce a random walk in orbital elements. This paper presents parametric exploration of the possible parameter space for this evolutionary scenario using two eccentricity damping timescales (0.1 and 0.3 Myr) and varying levels of turbulence. For each class of system, many realizations of the simulations are performed in order to determine the distributions of the resulting orbital elements of the surviving planets; this paper presents the results of 1200 numerical experiments. Our goal is to study the physics of this particular migration mechanism and to test it against observations of extrasolar planets. The action of disk torques and planet-planet scattering produces a wide range in semi-major axis and eccentricity, in rough agreement with observations. We find that as we increase the level of turbulence in the disk, pairs of planets are less likely to enter mean motion resonances, and fewer multiple planet systems survive.
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