Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-28
Astrophys.J.657:521-532,2007
Astronomy and Astrophysics
Astrophysics
34 pages, 11 figures. Accepted for publication in ApJ
Scientific paper
10.1086/511128
We performed N-body simulations of a dust layer without a gas component and examined the formation process of planetesimals. We found that the formation process of planetesimals can be divided into three stages: the formation of non-axisymmetric wake-like structures, the creation of aggregates, and the collisional growth of the aggregates. Finally, a few large aggregates and many small aggregates are formed. The mass of the largest aggregate is larger than the mass predicted by the linear perturbation theory. We examined the dependence of system parameters on the planetesimal formation. We found that the mass of the largest aggregates increase as the size of the computational domain increases. However the ratio of the aggregate mass to the total mass $M_\mathrm{aggr}/M_\mathrm{total}$ is almost constant $0.8-0.9$. The mass of the largest aggregate increases with the optical depth and the Hill radius of particles.
Furuya Izumi
Inutsuka Shu-ichiro
Kokubo Eiichiro
Michikoshi Shugo
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