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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Further observations of the tilted planet XO-3: A new determination of spin-orbit misalignment, and limits on differential rotation
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Further observations of the tilted planet XO-3: A new determination of spin-orbit misalignment, and limits on differential rotation

机译：XO-3倾斜行星的进一步观察：自旋轨道未对准的新确定以及差速旋转的限制

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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 found the projected spin-orbit angle to be λ = 37.°3±3.°0, in good agreement with a previous finding by Winn et al. (2009 ApJ, 700, 302). In addition, an offset of ～l22ms ~(-1) 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 attempted 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.
机译：我们报告了对XO-3系外行星系统的Rossiter-McLaughlin（RM）效应的观察结果。该系统的RM效果以前是由两个不同的小组测量的，但是他们的结果在统计上不一致。为了获得决定性的结果，我们用斯巴鲁8.2米望远镜观察了XO-3b的两次完整透射。通过使用新的且更精确的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±3.°0，与Winn等人的先前发现非常吻合。 （2009 ApJ，700，302）。此外，两个运输数据集之间的偏移量约为〜22ms〜（-1）。该偏移量可能是XO-3系统中第三个物体的信号，应通过以后的观察来检查这种可能性。我们还尝试首次在RM数据中搜索恒星差分旋转的可能特征，并对差分旋转参数设置较弱的上限。

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