Can stellar activity make a planet seem misaligned

Can stellar activity make a planet seem misaligned
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恒星活动会让行星看起来错位吗

DOI:
10.1051/0004-6361/201628728
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发表时间:
2016
期刊:
arXiv: Earth and Planetary Astrophysics
影响因子:
--
通讯作者:
A. Reiners
A. Reiners
中科院分区:
--
文献类型:
--
作者:
M. Oshagh;S. Dreizler;N. C. Santos;P. Figueira;A. Reiners

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一些研究表明,凌日行星对恒星活动区域的掩星会在高精度的凌日光曲线中产生异常,而这些异常可能导致对行星参数(如行星半径)的不准确估计。由于过境光曲线和罗西特-麦克劳克林效应(光谱过境)背后的物理和几何是相同的,预计罗西特-麦克劳克林观测结果将以类似的方式受到恒星活动区域掩星的影响。本文对Rossiter-McLaughlin测量得到的自旋轨道角进行了基本检验,并考察了凌日行星掩星对恒星活动区域的掩星对自旋轨道角估计的影响。我们的结果表明,由于恒星活动导致的自旋轨道角的不准确估计可能相当显著(高达~30度),特别是对于边缘,排列和小型凌日行星。因此,我们的结果表明,由于恒星的活动,排列的凌日行星很容易被误解为错位。换句话说,由于忽略恒星活动而产生的偏差不太可能是导致高度失调的系统的罪魁祸首。
Several studies have shown that the occultation of stellar active regions by the transiting planet can generate anomalies in the high-precision transit light curves, and these anomalies may lead to an inaccurate estimate of the planetary parameters (e.g., the planet radius). Since the physics and geometry behind the transit light curve and the Rossiter-McLaughlin effect (spectroscopic transit) are the same, the Rossiter-McLaughlin observations are expected to be affected by the occultation of stellar active regions in a similar way. In this paper we perform a fundamental test on the spin-orbit angles as derived by Rossiter-McLaughlin measurements, and we examine the impact of the occultation of stellar active regions by the transiting planet on the spin-orbit angle estimations. Our results show that the inaccurate estimation on the spin-orbit angle due to stellar activity can be quite significant (up to ~30 deg), particularly for the edge-on, aligned, and small transiting planets. Therefore, our results suggest that the aligned transiting planets are the ones that can be easily misinterpreted as misaligned owing to the stellar activity. In other words, the biases introduced by ignoring stellar activity are unlikely to be the culprit for the highly misaligned systems.
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