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arXiv 2005.00026astro-ph.GA
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Milky Way Bulge中每10颗星中就有8颗星体验100亿年内1000个AU内的恒星碰撞

8 in 10 Stars in the Milky Way Bulge Experience Stellar Encounters Within 1000 AU in a Gigayear

Moiya McTier, David Kipping, Kathryn Johnston

备注：
7 pages, 6 figures, accepted to MNRAS
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摘要：

银河系凸起是一个动荡的密集空间区域，挤满了恒星，它们之间的距离远小于太阳附近的恒星。在这种环境中，近距离恒星相遇的频率和接近程度的量化决定了物质的交换，行星轨道的破坏以及消毒能量事件的威胁。我们目前估计遇到率的恒星在银河系的隆起发现使用数值和分析方法相结合。通过对具有不同轨道能量和角动量的膨胀恒星的轨道进行积分，以找到它们随时间的位置，我们能够估计出恒星应该经历多少次近距离的恒星相遇，作为轨道形状的函数。我们确定，大约80%的膨胀恒星在1000 AU内遇到，一半的膨胀恒星将有超过35次这样的遭遇，都超过了10亿年。我们的工作对银河系凸起中行星的长期生存能力有着有趣的影响。

英文摘要：

The Galactic bulge is a tumultuous dense region of space, packed with stars separated by far smaller distances than those in the Solar neighborhood. A quantification of the frequency and proximity of close stellar encounters in this environment dictates the exchange of material, disruption of planetary orbits, and threat of sterilizing energetic events. We present estimated encounter rates for stars in the Milky Way bulge found using a combination of numerical and analytical methods. By integrating the orbits of bulge stars with varying orbital energy and angular momentum to find their positions over time, we were able to estimate how many close stellar encounters the stars should experience as a function of orbit shape. We determined that ~80% of bulge stars have encounters within 1000 AU and that half of bulge stars will have >35 such encounters, both over a gigayear. Our work has interesting implications for the long-term survivability of planets in the Galactic bulge.

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