希尔达小行星的长期轨道行为研究 I：全局稳定性模式与星表
On the Long-Term Orbital Behaviour of Hilda Asteroids - I. Global Stability Patterns and Catalogue
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中文总结 AI 辅助
本研究通过对2699颗希尔达小行星的长期动力学模拟，揭示了其稳定性分布，发现约54.7%高度稳定，支持希尔达群体起源于太阳系早期且过去规模更大的观点。
中文摘要 AI 辅助
希尔达小行星是 trapped in 3:2 mean-motion resonance (MMR) with Jupiter（与木星处于3:2平均运动共振）的天体，是研究太阳系形成与演化的迷人窗口。我们展示了希尔达区域中2,699颗编号小行星的详细动力学积分结果，在巨行星和太阳的影响下，对每颗希尔达小行星的243个克隆体进行了长达1 Gyr的演化跟踪；我们样本中的54.7%表现出极端的动力学稳定性，其中1,475颗希尔达小行星的所有克隆体在整个1 Gyr积分期间始终保持在3:2 MMR中。另有408颗希尔达小行星（占样本的15.1%）在模拟结束时，其超过50%的克隆体仍存活于MMR内。在剩余的30.2%的群体中，有327个天体（占12.1%）在100 Myr至1 Gyr之间的某个时刻失去了50%的克隆体，导致其动力学半衰期以数亿年计——这一结果与这些天体曾是太阳系早期以来被捕获的更大希尔达群体成员的观点相符。最后的489个天体（占18.12%）被证明高度不稳定——它们很可能是闯入者，在相对较近的过去被捕获到希尔达群体中。总体而言，我们的结果表明希尔达群体在过去更为庞大，而其长达Gyr时间尺度的显著高稳定性与原始起源相一致。
英文摘要
The Hildas are objects trapped in 3:2 mean-motion resonance (MMR) with Jupiter, and are a fascinating window into the Solar system's formation and evolution. We present the results of detailed dynamical integrations of 2,699 numbered asteroids in the Hilda region, following 243 clones of each Hilda for 1 Gyr under the influence of the giant planets and the Sun; 54.7% of our sample exhibit extreme dynamical stability, with all clones of 1,475 Hildas remaining trapped in the 3:2 MMR for the full 1 Gyr of our integrations. A further 408 Hildas (15.1% of the sample) see more than 50% of their clones surviving within the MMR at the end of the simulations. Of the remaining 30.2% of the population, 327 objects (12.1%) lose 50% of their clones at some point between the 100 Myr and 1 Gyr point, leading to dynamical half-lives measured in hundreds of millions of years -- a result compatible with those objects being members of a once larger population of Hildas trapped since the Solar system's youth. The final 489 objects (18.12\%) prove highly unstable -- and may well be interlopers, captured to the Hilda population in the relatively recent past. Overall, our results suggest that the Hilda population was larger in the past, while its remarkably high stability over Gyr timescales is consistent with a primordial origin.
发表机构
- Centre for Astrophysics, University of Southern Queensland（昆士兰大学南部天体物理中心）
- Centro de Investigación y Desarrollo en Ciencias Aeroespaciales, Academia Politécnica Aeronáutica, Fuerza Aérea de Chile（智利空军航空航天科学研发与理工学院）
- Centro Espacial Nacional, Fuerza Aérea de Chile（智利空军国家航天中心）
- Kindai University（近畿大学）
机构由 AI 辅助整理，请以论文原文为准。
