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arXiv 2103.10967astro-ph.EPastro-ph.IM
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木星特洛伊星群的星枝分类学

Astrocladistics of the Jovian Trojan Swarms

Timothy R. Holt, Jonathan Horner, David Nesvorný, Rachel King, Marcel Popescu, Brad D. Carter, Christopher C. E. Tylor

摘要:

木星特洛伊是两群共享木星轨道的小天体,聚集在领先和落后的拉格朗日点L $_4$和L $_5$周围。在这项工作中,我们调查了木星特洛伊人口使用的astrocladistics技术,适应生物学中使用的“生命之树”的方法。我们将WISE,SDSS,Gaia DR2和MOVIS调查的颜色数据与特洛伊人的物理和轨道特征知识相结合,以生成由具有独特特征的氏族组成的分类树。我们确定了48个氏族,表明可能有共同起源的物体群。其中有几个包含已知的碰撞家族的成员,虽然我们的工作确定了分类中的微妙之处,需要未来的调查。我们的氏族经常被分成子氏族,大多数可以分为10个超级氏族,反映了人口的等级性质。该项目的成果包括确定了几个高度优先的天体,以便进行更多的观测,并为即将进行的\textit{Lucy}飞行任务将要访问的天体提供了背景资料。我们的研究结果表明,星枝分类的能力,多个大型和异构的复合调查数据集分组有用的研究我们的太阳系的起源和演化。

英文摘要:

The Jovian Trojans are two swarms of small objects that share Jupiter's orbit, clustered around the leading and trailing Lagrange points, L$_4$ and L$_5$. In this work, we investigate the Jovian Trojan population using the technique of astrocladistics, an adaptation of the `tree of life' approach used in biology. We combine colour data from WISE, SDSS, Gaia DR2 and MOVIS surveys with knowledge of the physical and orbital characteristics of the Trojans, to generate a classification tree composed of clans with distinctive characteristics. We identify 48 clans, indicating groups of objects that possibly share a common origin. Amongst these are several that contain members of the known collisional families, though our work identifies subtleties in that classification that bear future investigation. Our clans are often broken into subclans, and most can be grouped into 10 superclans, reflecting the hierarchical nature of the population. Outcomes from this project include the identification of several high priority objects for additional observations and as well as providing context for the objects to be visited by the forthcoming \textit{Lucy} mission. Our results demonstrate the ability of astrocladistics to classify multiple large and heterogeneous composite survey datasets into groupings useful for studies of the origins and evolution of our 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。

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