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arXiv 0811.3420astro-ph
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论太阳系外行星偏心率的起源

On the origin of eccentricities among extrasolar planets

Daniel Malmberg, Melvyn B. Davies

摘要:

大多数观测到的太阳系外行星的质量与太阳系的气态巨星相似,但轨道却截然不同。许多恒星比预期的更接近它们的母恒星,它们的轨道通常相当偏心。我们证明了这些行星中的一些可能形成于与我们的太阳系非常相似的系统中,也就是说,在这些系统中,气体巨星最初在半长轴为几个au的轨道上,但气体巨星的质量都相当相似。如果这样的系统受到另一颗恒星的扰动,强烈的行星与行星之间的相互作用就会随之而来,导致几颗行星被抛出,而那些行星则留在更紧密和更偏心的轨道上。这些扰动系统的偏心率分布与已观测到的半长轴在1 - 6 au之间的太阳系外行星的偏心率分布非常相似。

英文摘要:

Most observed extrasolar planets have masses similar to, but orbits very different from, the gas giants of our solar system. Many are much closer to their parent stars than would have been expected and their orbits are often rather eccentric. We show that some of these planets might have formed in systems much like our solar system, i.e. in systems where the gas giants were originally on orbits with a semi-major axis of several au, but where the masses of the gas giants were all rather similar. If such a system is perturbed by another star, strong planet-planet interactions follow, causing the ejection of several planets while leaving those remaining on much tighter and more eccentric orbits. The eccentricity distribution of these perturbed systems is very similar to that of the observed extrasolar planets with semi-major axis between 1 and 6 au.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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