论文标题
行星系统的轨道及其视觉二进制伴侣之间的可能对齐
A Possible Alignment Between the Orbits of Planetary Systems and their Visual Binary Companions
论文作者
论文摘要
天文学家对宽二元同伴（大于100 au的半轴轴）对系外行星的形成和进化的影响没有完整的图像。我们使用GAIA EDR3和TESS任务的新数据来研究这些效果，以表征具有过境系外行星的宽二元系统。我们确定了67个属于宽阔的视觉二进制系统中的67种候选系外行星候选系统（具有确定的边缘轨道倾斜）的样本。我们得出了宽二元系统的轨道参数的限制，并测量了二进制轨道和行星轨道之间轨道倾斜度的最小差异。我们确定与对照样本相比，宽二元系统具有横向行星的倾斜度分布在统计上有显着差异，这两个分布的概率是0.0037。这意味着二元系统中的行星过多，其轨道与二进制的轨道保持一致。对齐系统的过度增加似乎主要具有小于700 au的半轴轴。我们研究了一些可能导致对齐的效果，并得出结论，在原行星磁盘上由未对准的二元同伴引起的扭矩是最有前途的解释。
Astronomers do not have a complete picture of the effects of wide-binary companions (semimajor axes greater than 100 AU) on the formation and evolution of exoplanets. We investigate these effects using new data from Gaia EDR3 and the TESS mission to characterize wide-binary systems with transiting exoplanets. We identify a sample of 67 systems of transiting exoplanet candidates (with well-determined, edge-on orbital inclinations) that reside in wide visual binary systems. We derive limits on orbital parameters for the wide-binary systems and measure the minimum difference in orbital inclination between the binary and planet orbits. We determine that there is statistically significant difference in the inclination distribution of wide-binary systems with transiting planets compared to a control sample, with the probability that the two distributions are the same being 0.0037. This implies that there is an overabundance of planets in binary systems whose orbits are aligned with those of the binary. The overabundance of aligned systems appears to primarily have semimajor axes less than 700 AU. We investigate some effects that could cause the alignment and conclude that a torque caused by a misaligned binary companion on the protoplanetary disk is the most promising explanation.
