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arXiv 2407.07590astro-ph.EPastro-ph.IM
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定义行星的定量标准

Quantitative Criteria for Defining Planets

Jean-Luc Margot, Brett Gladman, Tony Yang

AI总结:

本文针对IAU行星定义模糊且排除系外行星的问题,通过聚类分析提出两个定量统一框架,分别基于动力学主导性和质量来定义行星与系外行星。

摘要:

当前国际天文学联合会(IAU)对“行星”的定义存在问题,因为它含糊不清且排除了系外行星。在此,我们描述了定量行星分类学的各个方面,并检验了对太阳系天体进行无监督聚类的结果,以指导可能分类框架的开发。聚类分析得出了两个不令人意外的结论:(1)卫星与行星不同,(2)动力学主导性是行星分类学的自然组织原则。为了推广现有的动力学主导性标准,我们采用了一个适用于所有中心天体(褐矮星、恒星和恒星残骸)的通用清除时标。然后,我们提出了两个定量、统一的框架来定义行星和系外行星。第一个框架与IAU对太阳系行星的定义以及IAU对系外行星的工作定义一致。第二个框架是一个更简单的基于质量的框架,避免了当前IAU建议中固有的一些困难。

英文摘要:

The current IAU definition of "planet" is problematic because it is vague and excludes exoplanets. Here, we describe aspects of quantitative planetary taxonomy and examine the results of unsupervised clustering of Solar System bodies to guide the development of possible classification frameworks. Two unsurprising conclusions emerged from the clustering analysis: (1) satellites are distinct from planets and (2) dynamical dominance is a natural organizing principle for planetary taxonomy. To generalize an existing dynamical dominance criterion, we adopt a universal clearing timescale applicable to all central bodies (brown dwarfs, stars, and stellar remnants). Then, we propose two quantitative, unified frameworks to define both planets and exoplanets. The first framework is aligned with both the IAU definition of planet in the Solar System and the IAU working definition of an exoplanet. The second framework is a simpler mass-based framework that avoids some of the difficulties ingrained in current IAU recommendations.

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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