平面银河潮汐和恒星质量对彗星云动力学的影响
Effects of the Planar Galactic Tides and Stellar Mass on Comet Cloud Dynamics
摘要：
我们报告的第一个结果的研究计划，探索奥尔特云彗星的轨道的灵敏度的变化，在平面的磁盘的银河潮汐的强度，也在主机恒星的质量变化。我们进行了2D模拟，证实潮汐对彗星轨道的影响对恒星距离银河系中心的距离很敏感。一个比太阳更靠近银河系中心的彗星云，将使彗星近日点仅通过平面潮汐更有效地减少到内行星的区域。对于质量较小的恒星也有类似的结果。我们还展示了彗星注入的这种现象是如何持续的一组替代银河系潜在的模型。这些初步结果表明了一条富有成效的研究路线，旨在将彗星云动力学的研究推广到太阳系以外的系统。特别是，它将使我们能够研究彗星云在确定银河系宜居带边界方面所起的作用。
英文摘要：
We report the first results of a research program to explore the sensitivity of the orbits of Oort cloud comets to changes in the strength of the Galactic tides in the plane of the disk and also to changes in the mass of the host star. We performed 2D simulations that confirm that the effects of the tides on comet orbits are sensitive to a star's distance from the Galactic center. A comet cloud closer to the Galactic center than the Sun will have comet perihelia reduced to the region of the inner planets more effectively by the planar tides alone. Similar results are found for a star of smaller mass. We also show how this phenomenon of comet injection persists for a set of alternative Galactic potential models. These preliminary results suggest a fruitful line of research, one that aims to generalize the study of comet cloud dynamics to systems different from the Solar System. In particular, it will allow us to study the roles played by comet clouds in defining the boundaries of the Galactic Habitable Zone.
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