RESONANCE CAPTURE AND THE FORMATION OF THE OUTER PLANETS

被引:29
作者
BEAUGE, C [1 ]
AARSETH, SJ [1 ]
FERRAZMELLO, S [1 ]
机构
[1] UNIV CAMBRIDGE,INST ASTRON,CAMBRIDGE CB3 0HA,ENGLAND
基金
巴西圣保罗研究基金会;
关键词
ACCRETION; ACCRETION DISKS; METHODS; NUMERICAL; CELESTIAL MECHANICS; STELLAR DYNAMICS; PLANETS AND SATELLITES; GENERAL; SOLAR SYSTEM; FORMATION;
D O I
10.1093/mnras/270.1.21
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this paper we study a possible process for the formation of the outer planets, in which resonance capture induces the accretion of the planetary cores near exterior mean-motion commensurabilities of existing bodies. A two-dimensional N-body simulation is performed to test this hypothesis in the case of Saturn. Initial conditions consist of a swarm of 1000 equal-mass planetesimals distributed over a planar ring with extrema at 6.5 and 15 au. All bodies are originally in circular orbits. For the dynamical evolution of the population, the following interactions are considered: mutual gravitation between the bodies, physical collisions, gravitational perturbations from an existing Jupiter (present mass and orbit) and gas drag. The simulation is followed until a single body remains. The results show a single planetary core in a stable orbit with elements a = 9.78 au and e = 0.086, well in accord with the present-day Saturn. We also discuss the possible extension of these results to the formation of the other major planets.
引用
收藏
页码:21 / 34
页数:14
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