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arXiv 2201.05714astro-ph.EPastro-ph.IM
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REBOUND中的碰撞碎裂和体成分跟踪

Collisional fragmentation and bulk composition tracking in REBOUND

Anna C. Childs, Jason H. Steffen

摘要:

我们提出了一个碎片模块和组成跟踪代码的$n$体代码REBOUND。我们的分段代码利用以前的半分析模型,并遵循类似于$n$体代码MERCURY的分段的实现方法。在我们的$n$体模拟与碎裂,我们减少碰撞和行星形成的时间尺度膨胀的粒子半径的膨胀因子$f$和实验的各种值的$f$,以了解膨胀因素如何影响碰撞的历史和最终的行星系。随着膨胀因子的增加,合并的速度也会增加,从而产生具有更多行星和更大轨道的行星的行星系。此外,我们提出了一个组成跟踪代码,它遵循的组成变化的同质机构作为质量交换的函数,并使用它来研究如何碎片化和使用的扩展因子影响挥发性交付的内部地球盘。我们发现,碎片增强径向混合相对于完美的合并,平均而言,作为$f$增加,所以这样做的平均水团分数的行星。径向混合随着$f$的增加而减少,因为碰撞发生在早期,在天体有时间增长到激发轨道并远离其原始位置之前

英文摘要:

We present a fragmentation module and a composition tracking code for the $n$-body code REBOUND. Our fragmentation code utilises previous semi-analytic models and follows an implementation method similar to fragmentation for the $n$-body code MERCURY. In our $n$-body simulations with fragmentation, we decrease the collision and planet formation timescales by inflating the particle radii by an expansion factor $f$ and experiment with various values of $f$ to understand how expansion factors affect the collision history and final planetary system. As the expansion factor increases, so do the rate of mergers which produces planetary systems with more planets and planets at larger orbits. Additionally, we present a composition tracking code which follows the compositional change of homogeneous bodies as a function of mass exchange and use it to study how fragmentation and the use of an expansion factor affects volatile delivery to the inner terrestrial disc. We find that fragmentation enhances radial mixing relative to perfect merging and that on average, as $f$ increases so does the average water mass fraction of the planets. Radial mixing decreases with increasing $f$ as collisions happen early on, before the bodies have time to grow to excited orbits and move away from their original location

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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