K2-232c的发现：基于外伴星偏心率的热木星与暖木星的不同形成历史
The Discovery of K2-232c: Divergent Formation Histories for Hot and Warm Jupiters Based on Outer Companion Eccentricity
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中文总结 AI 辅助
通过发现K2-232c冷木星伴星，对比热木星与暖木星系统中外伴星偏心率，揭示热木星形成更剧烈，支持两族群独立起源。
中文摘要 AI 辅助
自从被发现以来，热木星一直是研究最多的系外行星类型之一，这得益于它们显著的体积、与宿主恒星的近距离以及它们与太阳系中任何天体的显著差异。然而，它们的形成和演化的细节仍然不清楚，包括它们与轨道更宽的暖木星族群之间是否存在任何联系。在这项工作中，我们报告了K2-232c的发现，它是一颗偏心的冷木星（周期$P = 1950 ^{+140}_{-120}$天，偏心率$e=0.352^{+0.095}_{-0.076}$，$M\sin{i} = 5.31^{+0.48}_{-0.45} {M_{\rm Jup}}$），是已知暖木星系统（周期$P = 11.1684377 \pm 0.0000010$天，偏心率$e=0.245^{+0.023}_{-0.024}$，质量$M = 0.427^{+0.039}_{-0.036} {M_{\rm Jup}}$）中的伴星。将该系统与文献中的背景相结合，我们发现冷木星的偏心率在热木星系统中通常高于暖木星系统，这表明热木星的形成过程比暖木星更具动力学剧烈性。这进一步支持了这两个族群彼此独立的观点，而冷木星似乎在塑造两者的形成中起着关键作用。
英文摘要
Ever since their discovery, hot Jupiters have been one of the most studied types of exoplanets to exist thanks to their significant size, their proximity to their host star, and their significant departure from anything present in our solar system. Yet, the details of their formation and evolution remain unclear, including their connection, if any, to the wider-orbiting warm Jupiter population. In this work, we present the discovery of K2-232c, an eccentric cold Jupiter ($P = 1950 ^{+140}_{-120}$ days, $e=0.352^{+0.095}_{-0.076}$, $M\sin{i} = 5.31^{+0.48}_{-0.45} {M_{\rm Jup}}$) companion in a known warm Jupiter ($P = 11.1684377 \pm 0.0000010$ days, $e=0.245^{+0.023}_{-0.024}$, $M = 0.427^{+0.039}_{-0.036} {M_{\rm Jup}}$) system. Placing this system in context with the literature, we find that cold Jupiter eccentricities are generally higher in hot Jupiter systems as compared to warm Jupiter systems, suggesting the formation of hot Jupiters is more dynamically violent than warm Jupiters. This adds further evidence to the claim that these two populations are independent from one another with cold Jupiters appearing to play a crucial role in shaping the formation of both.
发表机构
- Indiana University（印第安纳大学）
- Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）
- Princeton University（普林斯顿大学）
- Pontificia Universidad Católica de Chile（智利天主教 Pontificia 大学）
- Millennium Institute for Astrophysics（天体物理学千年研究所）
- Carnegie Science（卡内基科学）
- University of California, Santa Cruz（加州大学圣克鲁兹分校）
机构由 AI 辅助整理，请以论文原文为准。
