木星和土星卫星系统的支序分析
Cladistical analysis of the Jovian and Saturnian satellite systems
摘要：
木星和土星都有由卫星和光环组成的复杂系统。这些卫星可以分为动力组，这意味着类似的形成情景。最近，在这两颗气体巨星周围发现了更多的不规则卫星，这些卫星尚未被分类。这篇论文的目的是使用一种叫做分支系统学的分析技术来研究气体巨星的卫星和环之间的关系。分支系统学传统上用于研究生物体之间的关系，即“生命之树”。在这项工作中，我们执行的第一个分支研究的对象在行星科学的背景下。我们的方法使用卫星的轨道，物理和成分的特点，在木星和土星系统的对象进行分类。我们发现，在这两个系统，如家庭，在以前的研究中提出的卫星之间的主要关系，被广泛保留。此外，基于我们对木星系统的分析，我们确定了一个新的逆行不规则家族，Iocaste家族，并建议土星系统的Phoebe家族可以进一步分为两个子家族。我们还建议土星的不规则星族应该重新命名，以与木星星族的约定保持一致。使用分支系统学，我们也能够分配到家庭的新的未分类的不规则卫星。两者合计，本研究的结果表明，潜在的使用分支技术在调查轨道机构之间的关系。
英文摘要：
Jupiter and Saturn each have complex systems of satellites and rings. These satellites can be classified into dynamical groups, implying similar formation scenarios. Recently, a larger number of additional irregular satellites have been discovered around both gas giants that have yet to be classified. The aim of this paper is to examine the relationships between the satellites and rings of the gas giants, using an analytical technique called cladistics. Cladistics is traditionally used to examine relationships between living organisms, the `tree of life'. In this work, we perform the first cladistical study of objects in a planetary science context. Our method uses the orbital, physical and compositional characteristics of satellites to classify the objects in the Jovian and Saturnian systems. We find that the major relationships between the satellites in the two systems, such as families, as presented in previous studies, are broadly preserved. In addition, based on our analysis of the Jovian system, we identify a new retrograde irregular family, the Iocaste family, and suggest that the Phoebe family of the Saturnian system can be further divided into two subfamilies. We also propose that the Saturnian irregular families be renamed, to be consistent with the convention used in Jovian families. Using cladistics, we are also able to assign the new unclassified irregular satellites into families. Taken together, the results of this study demonstrate the potential use of the cladistical technique in the investigation of relationships between orbital bodies.
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