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arXiv 2310.18445astro-ph.EP
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冷恒星周围热木星与暖木星的恒星倾角分布相似迹象

Signs of Similar Stellar Obliquity Distributions for Hot and Warm Jupiters Orbiting Cool Stars

Marvin Morgan, Brendan P. Bowler, Quang H. Tran, Erik Petigura, Vighnesh Nagpal, Sarah Blunt

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AJ, accepted
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AI总结：

本文通过统一推导47颗冷恒星的视线方向倾角，发现热木星与暖木星的错位分布高度一致，并首次确认三个错位系统，表明两类巨行星的错位可能具有共同的起源机制。

摘要：

凌星巨行星为研究恒星倾角提供了天然机会，而恒星倾角可为近距离行星的起源和动力学历史提供线索。围绕类太阳恒星运行的热木星表现出倾角对齐的趋势，这表明倾角很少被激发，或者潮汐重新对齐很常见。然而，对于轨道间距更宽、预期不存在重新对齐机制的巨行星，其恒星倾角分布尚不清楚。在本工作中，我们结合自转周期、恒星半径和 $v \sin i$ 测量，对 47 颗拥有凌星热木星和暖木星的冷恒星（$T_\mathrm{eff}$ $<$ 6200 K）统一推导了视线方向倾角。在我们样本中显示出旋轨错位迹象的系统中，有三个系统是首次在此被确认为错位。特别值得关注的是 Kepler-1654，它是错位系统中周期最长（1047 天；2.0 AU）的巨行星之一，以及 Kepler-30，一个多行星错位系统。通过比较重建的底层倾角分布，我们发现热木星（跨越 $a/R_{*}$ = 3-20，约 0.01-0.1 AU）和暖木星（跨越 $a/R_{*}$ = 20-400，约 0.1-1.9 AU）的推断最小错位分布具有良好的一致性。以 90$\\%$ 的置信度，冷恒星周围至少有 24$^{+9}_{-7}\\%$ 的暖木星和 14$^{+7}_{-5}\\%$ 的热木星错位至少 10$^\circ$。因此，大多数拥有暖木星的恒星与旋轨对齐一致。热木星和暖木星错位率的相似性表明，要么这些偶发的错位是原初性的并起源于错位的盘，要么造成错位热木星的同一底层过程也导致了错位暖木星。

英文摘要：

Transiting giant planets provide a natural opportunity to examine stellar obliquities, which offer clues about the origin and dynamical histories of close-in planets. Hot Jupiters orbiting Sun-like stars show a tendency for obliquity alignment, which suggests that obliquities are rarely excited or that tidal realignment is common. However, the stellar obliquity distribution is less clear for giant planets at wider separations where realignment mechanisms are not expected to operate. In this work, we uniformly derive line-of-sight inclinations for 47 cool stars ($T_\mathrm{eff}$ $<$ 6200 K) harboring transiting hot and warm giant planets by combining rotation periods, stellar radii, and $v \sin i$ measurements. Among the systems that show signs of spin-orbit misalignment in our sample, three are identified as being misaligned here for the first time. Of particular interest are Kepler-1654, one of the longest-period (1047 d; 2.0 AU) giant planets in a misaligned system, and Kepler-30, a multi-planet misaligned system. By comparing the reconstructed underlying inclination distributions, we find that the inferred minimum misalignment distributions of hot Jupiters spanning $a/R_{*}$ = 3-20 ($\approx$ 0.01-0.1 AU) and warm Jupiters spanning $a/R_{*}$ = 20-400 ($\approx$ 0.1-1.9 AU) are in good agreement. With 90$\%$ confidence, at least 24$^{+9}_{-7}\%$ of warm Jupiters and 14$^{+7}_{-5}\%$ of hot Jupiters around cool stars are misaligned by at least 10$^\circ$. Most stars harboring warm Jupiters are therefore consistent with spin-orbit alignment. The similarity of hot and warm Jupiter misalignment rates suggests that either the occasional misalignments are primordial and originate in misaligned disks, or the same underlying processes that create misaligned hot Jupiters also lead to misaligned warm Jupiters.

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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