arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.05892astro-ph.EPastro-ph.SR
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TRAPPIST-1系统中自旋轨道对齐的证据

Evidence for Spin-orbit Alignment in the TRAPPIST-1 System

Teruyuki Hirano, Eric Gaidos, Joshua N. Winn, Fei Dai, Akihiko Fukui, Masayuki Kuzuhara, Takayuki Kotani, Motohide Tamura, Maria Hjorth, Simon Albrecht, Daniel … 展开作者

Teruyuki Hirano, Eric Gaidos, Joshua N. Winn, Fei Dai, Akihiko Fukui, Masayuki Kuzuhara, Takayuki Kotani, Motohide Tamura, Maria Hjorth, Simon Albrecht, Daniel Huber, Emeline Bolmont, Hiroki Harakawa, Klaus Hodapp, Masato Ishizuka, Shane Jacobson, Mihoko Konishi, Tomoyuki Kudo, Takashi Kurokawa, Jun Nishikawa, Masashi Omiya, Takuma Serizawa, Akitoshi Ueda, Lauren M. Weiss

摘要:

为了测量TRAPPIST-1系统的罗西特-麦克劳克林效应,我们在行星e,f和b的凌日期间进行了高分辨率光谱分析。光谱是用斯巴鲁8.2米望远镜上的红多普勒摄谱仪获得的,并补充了用拉斯坎布雷斯天文台全球望远镜的1米望远镜获得的同步测光。通过分析异常的径向速度,我们发现,在假设这三颗行星有共面轨道的情况下,投影的恒星相似度为$λ=1\pm 28$度,尽管我们警告径向速度数据显示出未知来源的相关噪声。我们还为恒星吸收线的预期变形寻找证据,从而探测到行星b的“多普勒阴影”,误报概率为$1.7\,\%$。对观测到的包括三次凌日的残差互相关图进行联合分析,给出了$λ=19_{-15}^{+13}$度。这些结果表明,TRAPPIST-1恒星与行星的共同轨道平面并没有严重的错位,尽管鼓励进一步的观测来验证这一结论。

英文摘要:

In an effort to measure the Rossiter-McLaughlin effect for the TRAPPIST-1 system, we performed high-resolution spectroscopy during transits of planets e, f, and b. The spectra were obtained with the InfraRed Doppler spectrograph on the Subaru 8.2-m telescope, and were supplemented with simultaneous photometry obtained with a 1-m telescope of the Las Cumbres Observatory Global Telescope. By analyzing the anomalous radial velocities, we found the projected stellar obliquity to be $λ=1\pm 28$ degrees under the assumption that the three planets have coplanar orbits, although we caution that the radial-velocity data show correlated noise of unknown origin. We also sought evidence for the expected deformations of the stellar absorption lines, and thereby detected the "Doppler shadow" of planet b with a false alarm probability of $1.7\,\%$. The joint analysis of the observed residual cross-correlation map including the three transits gave $λ=19_{-15}^{+13}$ degrees. These results indicate that the the TRAPPIST-1 star is not strongly misaligned with the common orbital plane of the planets, although further observations are encouraged to verify this conclusion.

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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