约束热木星的行星倾角分布
Constraining the Planetary Obliquity Distribution of Warm Jupiters
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中文总结 AI 辅助
本研究通过对6颗热木星的凌星光曲线进行分析，结合分层贝叶斯建模，约束了热木星的倾角分布，发现其中值倾角低于12°，并指出JWST观测可提供更严格的约束。
中文摘要 AI 辅助
热木星是一类起源尚不明确的行星，其行星倾角可用于区分不同形成路径：行星-行星散射与跨共振迁移会激发大倾角，而原位形成则更易产生低倾角。我们对6颗观测条件良好的热木星（TOI-201b、TOI-1670c、TOI-199b、Kepler-9c、Kepler-30c、Kepler-553c）的凌星光曲线中与扁率相关的异常进行了搜寻，每颗行星的光曲线均符合球形行星的特征，且对行星的天球投影扁率与倾角存在简并性约束。为克服这些局限，我们对种群层面的倾角分布开展了分层贝叶斯建模。假设热木星的扁率与土星相当（f≈0.1），我们发现其中值倾角低于12°（90%置信区间），且低于土星的倾角（27°）的概率为93%；类木星扁率（f≈0.06）及更大倾角的情况也被允许。詹姆斯·韦布空间望远镜（JWST）观测的模拟结果显示，未来可获得显著更严格的约束。
英文摘要
Warm Jupiters are an intriguing class of planets with uncertain origins. Their planetary obliquities could help distinguish between different formation pathways: planet-planet scattering and migration across resonances can excite large obliquities, whereas in-situ formation would more naturally produce low obliquities. We searched for oblateness-related anomalies in the transit light curves of six observationally favorable warm Jupiters: TOI-201b, TOI-1670c, TOI-199b, Kepler-9c, Kepler-30c, and Kepler-553c. Each planet's light curve is consistent with a spherical planet and provides degenerate constraints on the planet's sky-projected oblateness and obliquity. To overcome these limitations, we performed hierarchical Bayesian modeling of the population-level obliquity distribution. Assuming warm Jupiters are as oblate as Saturn ($f \approx 0.1$), we find their median obliquity to be below $12^\circ$ with $90$% confidence and below Saturn's obliquity ($27^\circ$) with $93$% confidence. Jupiter-like oblateness ($f \approx 0.06$) and larger obliquities are allowed. Simulations of JWST observations predict that significantly tighter constraints can be derived.
发表机构
- Princeton University（普林斯顿大学）
机构由 AI 辅助整理，请以论文原文为准。
