arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.1547astro-ph.EP
收藏

关于近距离太阳系外行星的各种起源

On the various origins of close-in extrasolar planets

S. Marchi, S. Ortolani, M. Nagasawa, S. Ida

摘要:

迄今为止发现的太阳系外行星与我们自己的太阳系中的行星非常不同。它们中的许多都有着类似木星的质量和近距离的轨道(所谓的热行星,HP),轨道周期只有几天。在本文中,我们提出了一个新的统计分析所观察到的EP,集中在HPs的起源。在迄今提出的几种HP形成机制中,两种主要的形成机制是II型迁移和散射。在这两种情况下,行星都是在所谓的原行星盘的雪线之外形成的,然后由于角动量和与原行星盘或伴星的能量交换而向内迁移。虽然理论研究产生了一系列的观察到的功能,观察到的EP和模型之间没有明确的对应关系尚未建立。在我们的分析中,通过主成分分析和层次聚类分析,我们发现令人信服的迹象存在两种类型的HP,其参数反映的物理机制的II型迁移和散射。

英文摘要:

The extrasolar planets (EPs) so far detected are very different to the planets in our own Solar System. Many of them have Jupiter-like masses and close-in orbits (the so-called hot planets, HPs), with orbital periods of only a few days. In this paper, we present a new statistical analysis of the observed EPs, focusing on the origin of the HPs. Among the several HP formation mechanisms proposed so far, the two main formation mechanisms are type II migration and scattering. In both cases, planets form beyond the so-called snow-line of the protoplanetary disk and then migrate inward due to angular momentum and energy exchange with either the protoplanetary disk or with companion planets. Although theoretical studies produce a range of observed features, no firm correspondence between the observed EPs and models has yet been established. In our analysis, by means of principal component analysis and hierarchical cluster analysis, we find convincing indications for the existence of two types of HPs, whose parameters reflect physical mechanisms of type II migration and scattering.

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。

↑