Effects of Planetesimal Dynamics on the Formation of Terrestrial Planets

Details Effects of Planetesimal Dynamics on the Formation of Terrestrial Planets Effects of Planetesimal Dynamics on the Formation of Terrestrial Planets

2003-10-14

arxiv.org/abs/astro-ph/0310392v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures, to be published in the proceedings of "Order and Chaos in Stellar and Planetary Systems" (eds. G. Byrd, K.

Scientific paper

Formation of terrestrial planets by agglomeration of planetesimals in protoplanetary disks sensitively depends on the velocity evolution of planetesimals. We describe a novel semi-analytical approach to the treatment of planetesimal dynamics incorporating the gravitational scattering by massive protoplanetary bodies. Using this method we confirm that planets grow very slowly in the outer Solar System if gravitational scattering is the only process determining planetesimal velocities, making it hard for giant planets to acquire their massive gaseous envelopes within less than 10 Myr. We put forward several possibilities for alleviating this problem.

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