Orbital architectures of planet-hosting binaries - II. Low mutual inclinations between planetary and stellar orbits
Orbital architectures of planet-hosting binaries - II. Low mutual inclinations between planetary and stellar orbits
复制标题
行星双星的轨道结构 - II。
DOI：
10.1093/mnras/stac306
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发表时间：
2022
影响因子：
4.8
通讯作者：
Dupuy T
中科院分区：
文献类型：
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作者：
Dupuy T
行星的形成通常被认为是围绕一颗星星的一个拱星盘。然而，恒星双星系统无处不在，因此所有潜在行星中的相当一部分必须在更复杂的动态环境中形成和演化。我们提出了一个为期5年的天体测量监测活动的结果，研究45个双星星星系统，hostKeplerplanet候选人。这些系统中的行星形成环境实际上是由持续到今天的双星轨道所塑造的。至关重要的是，恒星-行星轨道的相互倾斜只能通过统计样本来解决。我们详细描述了我们的样本选择和Keck/NIRC 2激光制导星星自适应光学观测从2012年到2017年收集。我们测量轨道弧，典型的精度为0.1 mas yr−1，测试双星轨道是否倾向于与边缘上的凌日行星轨道对齐。我们排除了随机分布的双星轨道在4.7σ，我们表明，低的相互倾斜需要解释所观察到的轨道弧。如果恒星轨道具有类似于场双星的偏心率分布，那么与我们观测到的轨道弧最匹配的是相互倾角分布，范围从0°到30°。我们讨论了这种广泛的行星双星排列的行星形成和拱星盘演化的理论背景下的影响。
Planet formation is often considered in the context of one circumstellar disc around one star. Yet, stellar binary systems are ubiquitous, and thus a substantial fraction of all potential planets must form and evolve in more complex, dynamical environments. We present the results of a 5 yr astrometric monitoring campaign studying 45 binary star systems that hostKeplerplanet candidates. The planet-forming environments in these systems would have literally been shaped by the binary orbits that persist to the present day. Crucially, the mutual inclinations of star–planet orbits can only be addressed by a statistical sample. We describe in detail our sample selection and Keck/NIRC2 laser guide star adaptive optics observations collected from 2012 to 2017. We measure orbital arcs, with a typical accuracy of ∼0.1 mas yr−1, that test whether the binary orbits tend to be aligned with the edge-on transiting planet orbits. We rule out randomly distributed binary orbits at 4.7σ, and we show that low mutual inclinations are required to explain the observed orbital arcs. If the stellar orbits have a field binary-like eccentricity distribution, then the best match to our observed orbital arcs is a distribution of mutual inclinations ranging from 0° to 30°. We discuss the implications of such widespread planet–binary alignment in the theoretical context of planet formation and circumstellar disc evolution.