Chaotic Dynamics of Trans-Neptunian Objects Perturbed by Planet Nine
Chaotic Dynamics of Trans-Neptunian Objects Perturbed by Planet Nine
复制标题
受第九行星扰动的海王星外天体的混沌动力学
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
M. Holman
中科院分区：
文献类型：
--
作者：
S. Hadden;Gongjie Li;M. Payne;M. Holman
对最遥远的海王星外天体（TNO）轨道聚集的观测激发了人们对太阳系外围潜伏着未被发现的第九颗行星的可能性的兴趣。许多作者的数值模拟表明，通过适当选择行星质量和轨道，这样的行星可以在遥远的海天体群体的轨道元素中保持聚集，类似于观测到的样本。然而，由如此遥远的偏心扰动引起的丰富的潜在动力学过程的许多方面尚未得到充分探索。我们报告了共面测试粒子动力学的研究结果，这些粒子与圆形轨道上的大质量天体（海王星）和更远、高偏心轨道上的大质量天体（假定的九号行星）相互作用。我们发现，对理想化模拟的详细检查可以深入了解可能的丰富的测试粒子动力学。特别是，我们发现混沌和共振重叠在粒子的动力学演化中起着重要作用。我们开发了一个简单的映射模型，使我们能够详细了解由混沌演化的粒子探索的重叠平均运动共振网络。我们还证明，与海王星的引力相互作用可以对粒子的轨道演化产生深远的影响。我们的结果可以作为更好地理解在更复杂的模拟中观察到的动力学行为的起点，这些动力学行为可用于约束第九行星的质量和轨道。
Observations of clustering among the orbits of the most distant trans-Neptunian objects (TNOs) has inspired interest in the possibility of an undiscovered ninth planet lurking in the outskirts of the solar system. Numerical simulations by a number of authors have demonstrated that, with appropriate choices of planet mass and orbit, such a planet can maintain clustering in the orbital elements of the population of distant TNOs, similar to the observed sample. However, many aspects of the rich underlying dynamical processes induced by such a distant eccentric perturber have not been fully explored. We report the results of our investigation of the dynamics of coplanar test-particles that interact with a massive body on an circular orbit (Neptune) and a massive body on a more distant, highly eccentric orbit (the putative Planet Nine). We find that a detailed examination of our idealized simulations affords tremendous insight into the rich test-particle dynamics that are possible. In particular, we find that chaos and resonance overlap plays an important role in particles’ dynamical evolution. We develop a simple mapping model that allows us to understand, in detail, the web of overlapped mean-motion resonances explored by chaotically evolving particles. We also demonstrate that gravitational interactions with Neptune can have profound effects on the orbital evolution of particles. Our results serve as a starting point for a better understanding of the dynamical behavior observed in more complicated simulations that can be used to constrain the mass and orbit of Planet Nine.
评估第九行星存在时太阳系外天体的动态稳定性
DOI：
10.3847/1538-3881/aa7aa2
发表时间：
2017
期刊：
The Astronomical Journal
影响因子：
--
作者：
Becker, Juliette C.;Adams, Fred C.;Khain, Tali;Hamilton, Stephanie J.;Gerdes, David
通讯作者：
Gerdes, David