Dynamical evolution of escaped plutinos, another source of Centaurs
Dynamical evolution of escaped plutinos, another source of Centaurs
复制标题
逃逸冥王星的动态演化，半人马座的另一个来源
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
G. D. Elía
中科院分区：
文献类型：
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作者：
R. Sisto;A. Brunini;G. D. Elía
语境。人们发现冥王星群中存在扩散非常缓慢的弱混沌轨道。这些轨道对应于长期的冥王星逃逸者，并代表目前逃离共振的冥王星。目标。我们进行数值模拟来探索最近逃离共振的冥王星的动态演化。方法。数值模拟分为两部分。首先，我们在共振中进化了 20000 个测试粒子来检测和选择长期逃逸者。在第二步中，我们对选定的逃逸冥王星进行了数值积分，以研究它们逃逸后的动态行为。结果。我们描述了冥王星的逃逸路线及其在半人马座区域的演化。我们得出目前冥王星的逃逸率为每 10 年 1 到 10 个。逃逸的冥王星在半人马座区域的平均寿命为 108 密尔，它们对半人马座人口的贡献将不到半人马座总人口的 6%。这样，逃脱的冥王星将成为半人马座的次要来源。
Context. Weakly chaotic orbits that diffuse very slowly have been found to exist in the plutino population. These orbits correspond to long-term plutino escapers and represent the plutinos presently escaping from the resonance. Aims. We perform numerical simulations to explore the dynamical evolution of plutinos that have recently escaped from the resonance. Methods. The numerical simulations were divided into two parts. In the first, we evolved 20 000 test particles in the resonance to detect and select the long-term escapers. In the second, we numerically integrated the selected escaped plutinos to study their dynamical post escaped behavior. Results. We characterize the escape routes of plutinos and their evolution in the Centaur zone. We derive a present rate of escape of plutinos of between 1 and 10 every 10 years. The escaped plutinos would have a mean lifetime in the Centaur zone of 108 Myr and their contribution to the Centaur population would be a fraction of smaller than 6% of the total Centaur population. In this way, escaped plutinos would be a secondary source of Centaurs.