INTERACTIONS IN EARLY SOLAR-SYSTEM

被引:25
作者
DORMAND, JR
WOOLFSON, MM
机构
[1] TEESSIDE POLYTECH,DEPT MATH & STAT,MIDDLESBOROUGH TS1 3BA,ENGLAND
[2] UNIV YORK,DEPT PHYS,HESLINGTON YO1 5DD,YORKSHIRE,ENGLAND
关键词
Asteroids - Comets - Debris - Earth (planet) - Interplanetary flight - Moon - Orbits - Satellites;
D O I
10.1093/mnras/180.2.243
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The capture theory of the origin of the solar system predicts protoplanets formed in near coplanar elliptical orbits with fairly high eccentricities. A resisting medium, which would be a byproduct of the capture event, would serve to round-off the orbits in a time which is short compared to the age of the solar system. It is shown that such a medium would also give rise to differential rotations of the lines of apses of the early planetary orbits, leading to a high probability of close interactions or collisions between planets. The consequences of a collision between two planets are considered. It is found that the larger planet could, in some cases, be expelled from the solar system and that the fragments of the smaller planet could give rise to some of the terrestrial planets. Moreover, it is suggested that the Earth-Moon system could be formed as a result of the capture of a major satellite of one of the colliding planets by a large fragment of the other planet. Mars is also identified in the satellite system of the ejected planet. Various types of debris from the collision could have produced the asteroids, meteorites and comets. An alternative explanation, in terms of the original capture event, is also given for the comets. The hypothesis is examined that Pluto is a byproduct of the collision, reaching its present orbit by interactions with Neptune. It is shown that as a consequence of such an interaction, Triton could have been perturbed sufficiently to reverse an initially prograde orbital motion. The transfer of Pluto from the collision region to the vicinity of Neptune could have occurred through multiple planetary perturbation. The outer satellites of Jupiter and Saturn are discussed in relation to the proposition that they originated from the debris of asteroid collisions within the spheres of influence of those planets. © Royal Astronomical Society.
引用
收藏
页码:243 / 279
页数:37
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