模拟Chariklo的最小环形世界
Simulating the Smallest Ring World of Chariklo
摘要：
在半人马座Chariklo周围发现了一个由两个密集的窄环组成的环系统。围绕着一个小物体的这些环的存在提出了各种问题，例如它们的起源，稳定性和寿命。为了理解Chariklo环的性质，我们首次对自引力碰撞粒子环进行了整体$N$ -体模拟。我们发现Chariklo应该比环材料更致密，以避免环的快速扩散。如果Chariklo的密度比环的物质大，那么内环就会出现被称为自重力尾迹的精细螺旋结构。这些尾流加速粘性传播的环显着，它们通常发生在约$100\,\mathrm{years}$的m大小的环颗粒的时间尺度上，这是相当短的时间尺度比以前的研究中提出的。这些窄环的存在意味着更小的环粒子或牧羊卫星的存在。
英文摘要：
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, such as 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 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 they typically occur on timescales of about $100\,\mathrm{years}$ 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.
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