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Habitable Planet Formation in Binary Planetary Systems

机译:二元行星系统中的宜居行星形成

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Recent radial velocity observations have indicated that Jovian-type planets can exist in moderately close binary star systems. Numerical simulations of the dynamical stability of terrestrial-class planets in such environments have shown that, in addition to their giant planets, these systems can also harbor Earth-like objects. In this paper we study the late stage of terrestrial planet formation in such binary planetary systems, and present the results of the simulations of the formation of Earth-like bodies in their habitable zones. We consider a circumprimary disk of Moon- to Mars-sized objects and numerically integrate the orbits of these bodies at the presence of the Jovian-type planet of the system and for different values of the mass, semimajor axis, and orbital eccentricity of the secondary star. Results indicate that Earth-like objects, with substantial amounts of water, can form in the habitable zone of the primary star. Simulations also indicate that by transferring angular momentum from the secondary star to protoplanetary objects, the giant planet of the system plays a key role in the radial mixing of these bodies and the water contents of the final terrestrial planets. We will discuss the results of our simulation and show that the formation of habitable planets in binary planetary systems is more probable in binaries with moderate to large perihelia.
机译:最近的径向速度观测表明,木星型行星可以存在于中等封闭的双星系统中。在这样的环境中,对地类行星动力学稳定性的数值模拟表明,除了它们的巨型行星之外,这些系统还可以容纳类似地球的物体。在本文中,我们研究了这种双星行星系统中地球行星形成的后期阶段,并给出了在其可居住区域内模拟地球状物体形成的模拟结果。我们考虑一个月球到火星大小的物体的周向盘,并在存在系统的木星型行星的情况下,并针对质量,半长轴和次级轨道的偏心率的不同值,对这些物体的轨道进行数值积分星。结果表明,含有大量水的类地物体可以在原恒星的宜居带中形成。模拟还表明,通过将角动量从次星转移到原行星上,系统的巨型行星在这些星体和最终地球行星的水分径向混合中发挥了关键作用。我们将讨论模拟的结果,并表明在中至大近日点的双星中,双星行星系统中宜居行星的形成更有可能。

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