Theoretical study on the origin and evolution of small icy bodies in the solar system

首先，我们研究了一颗巨行星对小行星的临时捕获，这可能在捕获巨行星的不规则卫星方面发挥了重要作用。通过数值模拟，我们研究了俘获率及其对各种轨道参数的依赖关系。我们的结果表明，木星的一些进动不规则卫星的源区对应于希尔达区。接下来，我们研究了潮汐环境中颗粒堆积和聚集体碰撞破坏的过程。我们得到了粒子吸积的临界径向距离，并阐明了碎裂的条件。最后，我们研究了一颗成长中的巨行星的行星环行气盘对小行星的捕获，这对于巨行星的常规卫星的起源是重要的。我们得到了俘获率，并研究了它们对各种参数的依赖关系。

First, we examined temporary capture of planetesimals by a giant planet, which likely played an important role in capture of irregular satellites of giant planets. Using numerical simulations, we investigated capture rates as well as their dependence on various orbital parameters. Our results suggest that the source region of some of the prograge irregular satellites of Jupiter corresponds to the Hilda region. Next, we examined the process of particle accretion and collisional disruption of aggregates in the tidal environment. We obtained the critical radial distance for particle accretion, and clarified the condition for disruption. Finally, we examined capture of planetesimals by the circumplanetary gas disk of a growing giant planet, which is important in relation to the origin of regular satellites of giant planets. We obtained capture rates and also investigated their dependence on various parameters.