Possible commensurabilities among pairs of extrasolar planets

被引:57
作者
Nelson, RP [1 ]
Papaloizou, JCB [1 ]
机构
[1] Queen Mary Univ London, Astron Unit, London E1 4NS, England
关键词
methods : N-body simulations; celestial mechanics; Solar system : formation; stars : individual : GJ 876; planetary systems : protoplanetary discs;
D O I
10.1046/j.1365-8711.2002.05506.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the possible commensurabilities to be expected when two protoplanets in the Jovian mass range, gravitationally interacting with each other and an external protoplanetary disc, are driven by disc-induced orbital migration of the outer protoplanet into a commensurability which is then maintained in subsequent evolution. We find that for a variety of protoplanet masses and typical protoplanetary disc properties, as well as the setting up of 2:1 commensurabilities of the type recently observed in GJ 876, 3:1 commensurabilities are often formed, in addition to 4:1, 5:1 and 5:2 commensurabilities which occur less frequently. The higher order commensurabilites are favoured when either one of the planets is massive, or the inner planet begins with a significant orbital eccentricity. Detection of such commensurabilities could yield important information relating to the operation of protoplanetary disc interactions during and shortly post-formation.
引用
收藏
页码:L26 / L30
页数:5
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