Accretional evolution of a planetesimal swarm: 1. A new simulation
Accretional evolution of a planetesimal swarm: 1. A new simulation
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星子群的吸积演化：1. 一种新的模拟
DOI：
10.1016/0019-1035(91)90041-q
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发表时间：
1991
期刊：
影响因子：
3.2
通讯作者：
F. Marzari
中科院分区：
文献类型：
--
作者：
D. Spaute;S. Weidenschilling;Donald R. Davis;F. Marzari
我们描述了一种新的行星吸积模拟，它处理许多相互作用的日心距离区中的同时吸积，而不是早期模型中的单一特征。微行星的特徴是开普勒元素，而不是单一的“随机速度”。该数值代码可以跟踪星子群的大小分布和轨道根数分布从任意初始大小和轨道分布的演化。它也可以将少数最大的天体视为具有单独轨道的离散物体，而不是作为连续体尺寸分布的一部分。我们描述了这个模型的结构，测试代码对凝结方程的两个解析解的结果，我们的结果与其他工人的比较。我们发现，我们的吸积算法产生良好的协议与解析解。我们还发现与Wetherill和Stewart（1989，Icarus 77，330-357）的结果一致的引力吸积的微行星具有相同的初始条件。此外，我们证明吸积在多个日心区。
We describe a new simulation for planetary accretion which treats simultaneous accretion in many interacting heliocentric distance zones, rather than the single one characteristic of earlier models. The planetesimals are characterized by keplerian elements rather than a single “random velocity.” This numerical code can follow the evolution of both the size distribution and the orbit element distribution of a planetisimal swarm from any initial distributions of sizes and orbits. It also can treat a small number of the largest bodies as discrete objects with individual orbits, rather than as part of the continuum size distribution. We describe the structure of this model, results of testing the code against two analytic solutions of the coagulation equation, and comparison of our results with those of other workers. We find that our accretion algorithm yields good agreement with the analytic solutions. We also find agreement with the results of Wetherill and Stewart (1989, Icarus 77, 330–357) for gravitational accretion of planetesimals with equivalent initial conditions. In addition, we demonstrate accretion in multiple heliocentric zones.