N-body simulation of gravitational interaction between planetesimals and a protoplanet. II - Dynamical friction

Computer Science

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Friction, Gravitational Effects, Many Body Problem, Protoplanets, Solar System Evolution, Computerized Simulation, Gas Giant Planets, Planetary Cores, Planetary Evolution, Temporal Distribution, Three Body Problem

Scientific paper

N-body 3D simulations are presently conducted for the dynamical friction of planetesimals with a view to the likelihood of runaway growth in the cases of both four-component systems with slightly different masses and a protoplanet that is embedded in a swarm of small planetesimals. While runaway growth in the former case begins in an early-stage planetesimal swarm which has a continuous mass distribution, the latter case involves a simultaneous decrease of a protoplanet's eccentricity and inclination due to the dynamical friction generated by the planetesimals. This scenario's decay timescale is characterized by the semianalytical theory of Ida (1990) and supports the protoplanet's runaway growth.

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