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arXiv 0803.3246astro-ph
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共面非共振行星系统的长期理论

A secular theory of coplanar, non-resonant planetary system

Cezary Migaszewski, Krzysztof Gozdziewski

摘要:

在行星间不存在平均运动共振的情况下,提出了共面$N$ -行星系统的久期理论。这个理论依赖于平均扰动的平均两体问题的平均值。我们将泰勒级数中的摄动哈密顿量关于半长轴比展开,半长轴比被认为是小参数,而对偏心率没有直接的限制。接下来,我们对结果序列逐项求平均。这是可能的,这要归功于对积分变量的特定但实际上非常基本的选择。它使得避免扰动汉密尔顿的傅里叶展开成为可能。我们推导出高阶扩展的平均长期哈密顿量(在这里,高达24的顺序)相对于半长轴比。由此产生的长期理论是八极理论的推广。将分析结果与数值结果(即,实际上精确)平均。我们估计的收敛半径的衍生的扩展,我们提出了一个进一步的改进算法。作为该方法的一个具体应用,我们研究了三行星共面系统的长期动力学。我们专注于HD 37124行星系统的定态解。

英文摘要:

We present the secular theory of coplanar $N$-planet system, in the absence of mean motion resonances between the planets. This theory relies on the averaging of a perturbation to the two-body problem over the mean longitudes. We expand the perturbing Hamiltonian in Taylor series with respect to the ratios of semi-major axes which are considered as small parameters, without direct restrictions on the eccentricities. Next, we average out the resulting series term by term. This is possible thanks to a particular but in fact quite elementary choice of the integration variables. It makes it possible to avoid Fourier expansions of the perturbing Hamiltonian. We derive high order expansions of the averaged secular Hamiltonian (here, up to the order of 24) with respect to the semi-major axes ratio. The resulting secular theory is a generalization of the octupole theory. The analytical results are compared with the results of numerical (i.e., practically exact) averaging. We estimate the convergence radius of the derived expansions, and we propose a further improvement of the algorithm. As a particular application of the method, we consider the secular dynamics of three-planet coplanar system. We focus on stationary solutions in the HD 37124 planetary system.

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