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arXiv 1107.0736astro-ph.EPastro-ph.SRmath.DSnlin.CD
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分级倾斜系统的潮汐演化

Tidal evolution of hierarchical and inclined systems

Alexandre C. M. Correia, Jacques Laskar, François Farago, Gwenaël Boué

摘要:

研究了在潮汐作用下,轨道半长轴比较小,轨道互倾较大(大于20 °)时,层次三体系统的动力学演化.使用四极非限制近似的引力相互作用和粘性线性模型的潮汐,我们推导出的平均运动方程的矢量形式主义,这是适合于模拟大量的各种系外行星系统在非常偏心和倾斜的轨道的长期演变。特别是,它可以被用来获得约束恒星自旋轨道不对准,捕获卡西尼状态,潮汐Kozai迁移,或阻尼的相互倾斜。因为我们的模型是有效的非限制性的问题,它可以用来研究系统的质量相同或外部限制性的问题,如一个行星的演化围绕一个双星系统。在这里,我们将我们的模型应用于三种不同的情况:1)HD 80606行星系,我们获得了失准角的概率密度函数分布,在53度和109度附近有两个明显的高概率峰值;(2)HD 98800双星系统,我们证明了在观测盘内的初始逆轨道可能变为逆轨道,反之亦然;(3)HD 11964行星系,我们证明了潮汐耗散与引力摄动的结合可能导致互倾角的减小和内轨道的快速圆化。

英文摘要:

We investigate the dynamical evolution of hierarchical three-body systems under the effect of tides, when the ratio of the orbital semi-major axes is small and the mutual inclination is relatively large (greater than 20 degrees). Using the quadrupolar non-restricted approximation for the gravitational interactions and the viscous linear model for tides, we derive the averaged equations of motion in a vectorial formalism which is suitable to model the long-term evolution of a large variety of exoplanetary systems in very eccentric and inclined orbits. In particular, it can be used to derive constraints for stellar spin-orbit misalignment, capture in Cassini states, tidal-Kozai migration, or damping of the mutual inclination. Because our model is valid for the non-restricted problem, it can be used to study systems of identical mass or for the outer restricted problem, such as the evolution of a planet around a binary of stars. Here, we apply our model to three distinct situations: 1) the HD80606 planetary system, for which we obtain the probability density function distribution for the misalignment angle, with two pronounced peaks of higher probability around 53 and 109 degrees; 2) the HD98800 binary system, for which we show that initial prograde orbits inside the observed disc may become retrograde and vice-versa, only because of tidal migration within the binary stars; 3) the HD11964 planetary system, for which we show that tidal dissipation combined with gravitational perturbations may lead to a decrease in the mutual inclination, and a fast circularization of the inner orbit.

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