Simulating the Smallest Ring World of Chariklo
Simulating the Smallest Ring World of Chariklo
复制标题
模拟 Chariklo 的最小环形世界
DOI：
10.3847/2041-8213/aa6256
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
E. Kokubo
中科院分区：
文献类型：
--
作者：
S. Michikoshi;E. Kokubo
在半人马Chariklo周围发现了一个由两个密集的窄环组成的环系统。这些环围绕着一个小物体的存在，对它们的起源、稳定性和寿命提出了各种各样的问题。为了了解Chariklo环的性质，我们首次对自引力碰撞粒子环进行了全局n体模拟。我们发现Chariklo应该比环的物质密度大，以避免环的快速扩散。如果Chariklo比环的物质密度大，内环就会出现被称为自重力尾迹的精细螺旋结构。这些尾迹显著地加速了环的粘性扩散，通常发生在大约m大小的环颗粒的时间尺度上，这比以前的研究提出的时间尺度要短得多。这些窄环的存在意味着更小的环粒子或引导卫星的存在。
A ring system consisting of two dense narrow rings has been discovered around Centaur Chariklo. The existence of these rings around a small object poses various questions about their origin, stability, and lifetime. In order to understand the nature of Chariklo’s rings, we perform global N-body simulations of the self-gravitating collisional particle rings for the first time. We find that Chariklo should be denser than the ring material in order to avoid the rapid diffusion of the rings. If Chariklo is denser than the ring material, fine spiral structures called self-gravity wakes occur in the inner ring. These wakes accelerate the viscous spreading of the ring significantly and typically occur on timescales of about for m-sized ring particles, which is considerably shorter than the timescales suggested in previous studies. The existence of these narrow rings implies smaller ring particles or the existence of shepherding satellites.