arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1108.4493astro-ph.EP
收藏

倾斜行星XO-3的进一步观测:自旋轨道不对准的新测定,以及差动旋转的限制

Further Observations of the Tilted Planet XO-3: A New Determination of Spin-Orbit Misalignment, and Limits on Differential Rotation

Teruyuki Hirano, Norio Narita, Bun'ei Sato, Joshua N. Winn, Wako Aoki, Motohide Tamura, Atsushi Taruya, Yasushi Suto

摘要:

我们报告的观测罗西特-麦克劳克林(RM)效应的XO-3系外行星系统。先前由两个不同的组测量了系统的RM效应,但其结果在统计学上不一致。为了获得决定性的结果,我们用斯巴鲁8.2米望远镜观测了XO-3b的两次完整凌日。通过用一个新的更精确的RM效应解析公式对这些数据进行建模,我们发现投影的自旋轨道角为λ=37.3 deg \pm 3.0 deg,与Winn等人(2009)之前的发现非常一致。此外,在两个凌日数据集之间观察到约22 m/s的偏移。这种偏移可能是XO-3系统中第三个天体的信号,这种可能性应该在未来的观测中进行检查。我们还首次尝试在RM数据中寻找恒星差旋的可能特征,并对差旋参数设置了弱上限。

英文摘要:

We report on observations of the Rossiter-McLaughlin (RM) effect for the XO-3 exoplanetary system. The RM effect for the system was previously measured by two different groups, but their results were statistically inconsistent. To obtain a decisive result we observed two full transits of XO-3b with the Subaru 8.2-m telescope. By modeling these data with a new and more accurate analytic formula for the RM effect, we find the projected spin-orbit angle to be λ=37.3 deg \pm 3.0 deg, in good agreement with the previous finding by Winn et al. (2009). In addition, an offset of ~22 m/s was observed between the two transit datasets. This offset could be a signal of a third body in the XO-3 system, a possibility that should be checked with future observations. We also attempt to search for a possible signature of the stellar differential rotation in the RM data for the first time, and put weak upper limits on the differential rotation parameters.

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。

↑