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arXiv 1001.0657astro-ph.EPastro-ph.SR
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圆盘对倾斜轨道上行星的偏心抽运

Eccentricity pumping of a planet on an inclined orbit by a disc

Caroline Terquem, Aikel Ajmia

摘要:

在本文中,我们表明,偏心率的行星在一个倾斜的轨道上相对于一个磁盘可以泵到高值的引力位的磁盘,即使当行星的轨道穿过磁盘平面。这个过程是Kozai效应的延伸。如果行星的轨道正好在圆盘的内腔内,这个过程在形式上与经典的Kozai效应相同。如果行星的轨道穿过圆盘,但圆盘的大部分质量都在轨道之外,当轨道和圆盘之间的初始角度大于某个临界值时,行星的偏心率会增加,这个临界值可能比经典的39度小得多。偏心率和倾斜角都随时间周期性地变化。当偏心率的振荡周期小于圆盘的寿命时,行星可能随着圆盘的消散而留在偏心轨道上。

英文摘要:

In this paper, we show that the eccentricity of a planet on an inclined orbit with respect to a disc can be pumped up to high values by the gravitational potential of the disc, even when the orbit of the planet crosses the disc plane. This process is an extension of the Kozai effect. If the orbit of the planet is well inside the disc inner cavity, the process is formally identical to the classical Kozai effect. If the planet's orbit crosses the disc but most of the disc mass is beyond the orbit, the eccentricity of the planet grows when the initial angle between the orbit and the disc is larger than some critical value which may be significantly smaller than the classical value of 39 degrees. Both the eccentricity and the inclination angle then vary periodically with time. When the period of the oscillations of the eccentricity is smaller than the disc lifetime, the planet may be left on an eccentric orbit as the disc dissipates.

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