论文标题
在银河系中的10星中有8颗星在1000 au中遇到恒星体验
8 in 10 Stars in the Milky Way Bulge Experience Stellar Encounters Within 1000 AU in a Gigayear
论文作者
论文摘要
银河凸起是一个动荡的空间茂密区域，挤压恒星的距离比太阳能邻居的距离小得多。在这种环境中，近距离遇到的频率和接近性的量化决定了材料的交换，行星轨道的破坏以及对能量事件进行消毒的威胁。我们提出了使用数值和分析方法组合发现的银河系凸起的恒星估计遇到率。通过将具有变化的轨道能量和角动量的凸出恒星的轨道整合在一起，以找到它们的位置，我们能够估计恒星应与轨道形状的函数相遇多少恒星应经历的恒星应经历。我们确定约80％的凸出恒星在1000 au之内遭遇，而一半的凸起恒星将在吉维（Gigayear）上遇到> 35个这样的相遇。我们的工作对银河膨胀中行星的长期生存具有有趣的意义。
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.
