Projected spin-orbit alignments from Kepler asteroseismology and Gaia astrometry
Projected spin-orbit alignments from Kepler asteroseismology and Gaia astrometry
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开普勒星震学和盖亚天体测量学预测的自旋轨道排列
DOI：
10.1093/mnrasl/slad012
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Ball W
中科院分区：
文献类型：
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作者：
Ball W
双星系统中恒星的自转轴和轨道轴之间的夹角--双星度--是这些系统如何形成和演化的一个重要指标，但很少有这样的测量。我们结合联合收割机的样本天体测量轨道倾角从盖亚数据第3版与样本的太阳一样的振荡器，其中的旋转倾角已被测量使用asteroseismology。我们补充我们的样本与一个二进制的视觉轨道已被确定使用散斑干涉，并提出了五个系统中的投影自旋轨道对齐。我们发现，每个系统，和整体样本，是一致的对齐，但有重要的警告。首先，星震的旋转倾角从根本上是模糊的，其次，我们只能测量投影（而不是真实的）倾斜度。如果旋转和轨道倾角是独立的，各向同性分布，绘制我们的数据的可能性是由chance不到百分之几，虽然小，我们的数据集反对均匀随机双星系。我们推测，利用美国宇航局的凌日系外行星调查卫星任务的数据，还可以进行几十次测量，主要是在红巨星中。欧空局的行星凌日和振荡任务可能会在主序星和次巨星系统中产生数百个更多的自旋轨道测量。
The angle between the rotation and orbital axes of stars in binary systems – the obliquity – is an important indicator of how these systems form and evolve, but few such measurements exist. We combine the sample of astrometric orbital inclinations fromGaiaData Release 3 with a sample of solar-like oscillators in which rotational inclinations have been measured using asteroseismology. We supplement our sample with one binary whose visual orbit has been determined using speckle interferometry and present the projected spin–orbit alignments in five systems. We find that each system, and the overall sample, is consistent with alignment but there are important caveats. First, the asteroseismic rotational inclinations are fundamentally ambiguous and, secondly, we can only measure the projected (rather than true) obliquity. If rotational and orbital inclinations are independent and isotropically distributed, the likelihood of drawing our data by chance is less than a few per cent. Though small, our data set argues against uniformly random obliquities in binary systems. We speculate that dozens more measurements could be made using data from NASA’sTransiting Exoplanet Survey Satellitemission, mostly in red giants. ESA’sPLAnetary Transits and Oscillationsmission will likely produce hundreds more spin–orbit measurements in systems with main-sequence and subgiant stars.
DOI：
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发表时间：
1960
期刊：
影响因子：
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作者：
L. Binnendijk
通讯作者：
L. Binnendijk