arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2402.03441astro-ph.EP
收藏

雪线之外的行星离心率分布及其对行星宜居性的影响

Eccentricity Distribution Beyond the Snow Line and Implications for Planetary Habitability

Stephen R. Kane, Robert A. Wittenmyer

AI总结:

本研究通过观测和动力学模拟发现,冷巨行星中位离心率(0.23)显著高于内行星,且其偏心轨道能更高效地向雪线内散射挥发性物质,从而增加行星宜居性潜力。

摘要:

行星系统人口统计学研究中的一个基本问题是:太阳系架构有多普遍?这一问题的重要性主要在于行星系统创造宜居环境的潜力,以及剖析太阳系演化中促成地球拥有可持续温带表面的各个组成部分。在这方面,一个重要的因素是挥发性物质向内系统的输送,以及依赖于雪线之外的气态巨行星作为散射体,尤其是因为此类冷巨行星相对稀少。在此,我们研究了位于系统雪线内外两侧的气态巨行星群体的离心率分布。我们表明,冷巨行星的中位离心率为0.23,而内行星的轨道则远为更接近圆形。我们进一步展示了一项动力学模拟的结果,该模拟比较了木星类似体与一颗离心率匹配冷巨行星中位离心率的木星的粒子散射潜力。这些模拟表明,与木星类似体的情况相比,此类偏心冷巨行星系统将挥发性物质散射至雪线以内的能力显著增强,导致穿越地球轨道的挥发性物质体积大大增加。因此,许多已知的含有冷巨行星的系统可能在雪线以内蕴藏水世界。

英文摘要:

A fundamental question in the study of planetary system demographics is: how common is the solar system architecture? The primary importance of this question lies in the potential of planetary systems to create habitable environments, and dissecting the various components of solar system evolution that contributed to a sustainable temperate surface for Earth. One important factor in that respect is volatile delivery to the inner system and the dependence on giant planets beyond the snow line as scattering agents, particularly as such cold giant planets are relatively rare. Here, we provide an investigation of the eccentricity distribution for giant planet populations both interior and exterior to their system snow lines. We show that the median eccentricity for cold giants is 0.23, compared with a far more circular orbital regime for inner planets. We further present the results of a dynamical simulation that explores the particle scattering potential for a Jupiter analog in comparison with a Jupiter whose eccentricity matches that of the median cold giant eccentricity. These simulations demonstrate that the capacity for such an eccentric cold giant system to scatter volatiles interior to the snow line is significantly increased compared with the Jupiter analog case, resulting in a far greater volume of Earth-crossing volatiles. Thus, many of the known systems with cold giant planets may harbor water worlds interior to the snow line.

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。

↑