Dynamical Stability and Dynamical Evolution of Extra-Solar Planetary System

太阳系外行星系统的动力学稳定性与动力学演化

基本信息

批准号：
12640241
负责人：
KINOSHITA Hiroshi
金额：
$ 0.96万
依托单位：
National Astronomical Observatory
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640241/
关键词：
Extrasolar Planets Mean Motion Resonance Secular Resonance Corotation of Pericenters 系外惑星系

项目摘要

Since the discovery of a planet Of 51 Peg, 76 planets orbiting nearby stars have been discovered from the Doppler observations. Among them v Andromedae has three planets and, GJ876, HD83443, HD1683443, HD82943, HD74156, and 47 Uma have two planets. In the planetary systems of HD83443, HD1683443, HD74156, and 47 Uma the mutual distance between two planets are very large compared with their mutual Hill radius and then they are dynamically stable. In other three planetary stems the mutual distances are small and their eccentricity large, which means that a close approach may take place and become unstable. We mainly investigated the long-term dynamical stability of these planetary systems and obtained the following results : 1)These planetary systems are stabilized by the corotation of the pericenters and/or 2 : 1 mean motion resonance. 2)The stability of outer two planets of v Andromedae is maintained by the corotation of the pericenters, which avoid the close approaches of two planets. The disturbance to the most inner planet from two outer planets is weak and the planetary system of the v Andromedae is stable. 3-1) When two planets of GJ876 have minimum mass estimated from the observation, this planetary system. The is stabilized only of 2 : 1 mean motion resonance. 3-2)When the two planets have much larger masses, they are stabilized by 2 : 1 mean motion resonance and the corotation of the pericenters

自从发现51个钉子的行星以来，从多普勒观测值中发现了76个绕着附近恒星绕的行星。其中V andromedae具有三个行星，GJ876，HD83443，HD1683443，HD82943，HD74156和47 UMA有两个行星。在HD83443，HD1683443，HD74156和47 UMA的行星系统中，两个行星之间的相互距离与它们的互相半径相比非常大，然后动态稳定。在其他三个行星茎中，相互距离很小，其偏心较大，这意味着可能发生近距离的方法并变得不稳定。我们主要研究了这些行星系统的长期动力学稳定性，并获得了以下结果：1）这些行星系统通过周围的人的旋转和/或2：1的平均运动共振稳定。 2）V andromedae的外部两个行星的稳定性通过围绕院士的旋转来维持，从而避免了两个行星的近距离接近。从两个外行星对最内部行星的干扰是弱的，V andromedae的行星系统稳定。 3-1）当两个GJ876的行星从观察过程中估计的最小质量时，该行星系统。仅在2：1平均运动共振中稳定。 3-2）当两个行星具有更大的质量时，它们会被2：1平均运动共振稳定和周围的脉络稳定