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arXiv 1405.7632astro-ph.EP
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受倾斜伴星扰动的紧凑行星系:I.长期模型的矢量表示

Compact planetary systems perturbed by an inclined companion: I. Vectorial representation of the secular model

Gwenaël Boué, Daniel Fabrycky

摘要:

紧凑型行星系的非共振长期动力学模型是由一个扰动函数,通常是展开的偏心率和绝对倾角相对于不变平面。这里,表达式以矢量形式给出,这自然导致偏心率和相互倾斜的扩展。这两种方法在大多数情况下是等价的,但矢量方法是专门针对准共面系统作为一个整体倾斜了很大的量。此外,哈密顿量和运动方程的矢量表达式比用通常的椭圆元素给出的表达式略简单。我们还提供了长期的扰动函数的矢量形式展开的半长轴比允许任意偏心率和倾角。还提供了中央恒星的赤道隆起与其行星之间的相互作用,以及由中央恒星引起的任何行星的相对论近点岁差。我们说明了使用这种表示的长期振荡的太阳系的类地行星,和Kozai周期可能发生在系外行星系统。

英文摘要:

The non-resonant secular dynamics of compact planetary systems are modeled by a perturbing function which is usually expanded in eccentricity and absolute inclination with respect to the invariant plane. Here, the expressions are given in a vectorial form which naturally leads to an expansion in eccentricity and mutual inclination. The two approaches are equivalent in most cases, but the vectorial one is specially designed for those where a quasi-coplanar system tilts as a whole by a large amount. Moreover, the vectorial expressions of the Hamiltonian and of the equations of motion are slightly simpler than those given in terms of the usual elliptical elements. We also provide the secular perturbing function in vectorial form expanded in semimajor axis ratio allowing for arbitrary eccentricities and inclinations. The interaction between the equatorial bulge of a central star and its planets is also provided, as is the relativistic periapse precession of any planet induced by the central star. We illustrate the use of this representation for following the secular oscillations of the terrestrial planets of the solar system, and for Kozai cycles as may take place in exoplanetary systems.

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