arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.15666astro-ph.EPastro-ph.GA
收藏

恒星近飞对太阳系碎片盘的倾斜激发

Inclination Excitation of Solar System Debris Disk due to Stellar Flybys

Nathaniel W. H. Moore, Gongjie Li, Fred C. Adams

摘要:

大多数恒星形成于星团中,在星团中与其他恒星相对近距离的相遇是很常见的,并且可以在行星系的轨道结构上留下印记。在本文中,我们调查的倾斜激励的碎片盘粒子由于这样的恒星遭遇。我们推导出一个解析表达式,描述倾斜激发的恒星飞越是遥远的层次限制。然后,我们得到相应的粒子倾角分布在非分级制度使用一个大的合奏N体模拟的数值结果。对于遇到预期的参数,我们发现,磁盘粒子的散装倾角仍然很低。然而,一个独特的高倾角人口产生的天体碰撞粒子的最终近心距离以上$50$ AU。最大程度$i_t$的倾角分布规模与遇到$\sin(i_s)$的大质量恒星飞掠低入射速度的倾角。观测到的海王星外天体的倾角分布对我们太阳系的动力学历史产生了限制。例如,这些结果意味着太阳诞生星团的数密度$n$和太阳停留时间$τ$的乘积的上限,其形式为$nτ\lesssim8\times10^4$ Myr pc $^{-3}$。随着今后对外太阳系的观测调查,可以得出更强的限制。

英文摘要:

Most stars form in clusters where relatively close encounters with other stars are common and can leave imprints on the orbital architecture of planetary systems. In this paper, we investigate the inclination excitation of debris disk particles due to such stellar encounters. We derive an analytical expression that describes inclination excitation in the hierarchical limit where the stellar flyby is distant. We then obtain numerical results for the corresponding particle inclination distribution in the non-hierarchical regime using a large ensemble of N-body simulations. For encounters with expected parameters, we find that the bulk inclination of the disk particles remains low. However, a distinct high inclination population is produced by prograde stellar encounters for particles with final pericenter distances above $50$AU. The maximum extent $i_t$ of the inclination distribution scales with the inclination of the encounter $\sin(i_s)$ for massive star flybys with low incoming velocity. The inclination distribution of observed trans-Neptunian objects places constraints on the dynamical history of our Solar System. For example, these results imply an upper limit on product of the number density $n$ of the solar birth cluster and the Sun's residence time $τ$ of the form $nτ\lesssim8\times10^4$ Myr pc$^{-3}$. Stronger constraints can be derived with future observational surveys of the outer Solar System.

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。

↑