经典带外海王星天体轨道倾角的长期演化
On the Secular Evolution of Inclinations Among the Classical Belt TNOs
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- Brigham Young University（杨百翰大学）
- Planetary Science Institute（行星科学研究所）
- University of Arizona（亚利桑那大学）
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中文总结 AI 辅助
本研究通过比较已知与合成TNOs的本征轨道要素，发现经典带42-45 au处存在由g+s-g8-s8共振引起的倾角依赖性不稳定，并据此估计原始冷经典带倾角宽度约1.5度，表明其边界并非由共振直接设定。
中文摘要 AI 辅助
本征轨道要素已被以多种方式用于研究外海王星天体（TNOs）的动力学结构，为太阳系演化和迁移理论提供了见解。在本文中，我们给出了所有已知TNOs的数值计算本征要素。然后，我们将它们的分布与一个大样本合成样本的本征要素分布进行比较，该合成样本是为了研究经典带区域TNOs的长期行为而生成的，旨在更好地理解某些观测特征，特别是这些TNOs倾角分布中出现的特征。我们的分析表明，在42 < a < 45 au的经典带中存在一个依赖于倾角的不稳定性，我们发现这是由g+s-g8-s8 = 0长期共振引起的。这种不稳定性与先前注意到的冷经典带在Ifree = 4（度）本征倾角附近的倾角边界重合，这可能表明原始经典带在4 < Ifree（度）< 6之间的连续性可能比我们今天观测到的更强。然而，我们为考虑长期共振不稳定性的影响而进行的分析发现，原始冷经典带的倾角宽度的最佳估计值约为1.5（度），远低于4（度），并且比先前研究提出的略薄。我们得出结论，冷经典带的倾角边界并非直接由长期共振或不稳定性设定，并且自行星迁移结束以来，该带通常未受共振或不稳定性的改变。
英文摘要
Proper orbital elements have been used in diverse ways to study the dynamical architecture of transneptunian objects (TNOs), providing insights into Solar System evolution and migration theories. In this paper, we present the numerically-computed proper elements of all known TNOs. We then compare their distribution with the distribution of proper elements of a large synthetic sample generated to study the secular behavior of TNOs in the Classical belt region in an effort to better understand certain observed features, particularly features appearing in the inclination distribution of these TNOs. Our analysis indicates the presence of an inclination-dependent instability in the Classical belt from 42 < a < 45 au, which we find is caused by the g+s-g8-s8 = 0 secular resonance. The coincidence of this instability with the previously-noted inclination boundary of the Cold Classical belt near proper inclination of Ifree = 4 (deg) could suggest that the primordial Classical belt may have originally been more continuous between 4 < Ifree (deg) < 6 than we observe today. However, our analysis to account for the impact of secular resonant instabilities finds a best-estimate of the inclination width of the primordial Cold Classical belt near 1.5(deg), well below 4(deg), and slightly thinner than previous works have suggested. We conclude that the inclination boundary of the Cold Classical belt is not set directly by secular resonance or instability, and that this belt is generally unaltered by resonance or instability since the end of planetary migration.
