Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-15
Astrophys.J.666:423-435,2007
Astronomy and Astrophysics
Astrophysics
15 pages, 13 figures (2 color ones), accepted for publication in ApJ
Scientific paper
10.1086/519918
We investigate the orbit-crossing time (T_c) of protoplanet systems both with and without a gas-disk background. The protoplanets are initially with equal masses and separation (EMS systems) scaled by their mutual Hill's radii. In a gas-free environment, we find log (T_c/yr) = A+B \log (k_0/2.3). Through a simple analytical approach, we demonstrate that the evolution of the velocity dispersion in an EMS system follows a random walk. The stochastic nature of random-walk diffusion leads to (i) an increasing average eccentricity
Lin Douglas N. C.
Sun Yi-Sui
Zhou Ji-Lin
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