arXiv 1010.09662010-10-05astro-ph.EP

系外行星宿主星的重心运动：太阳自旋-轨道耦合的试验

The barycentric motion of exoplanet host stars: tests of solar spin-orbit coupling

M. A. C. Perryman, T. Schulze-Hartung

备注：: 7 pages, 3 figures. Accepted for publication in A&A
DOI：: 10.1051/0004-6361/201015668

摘要：

经验证据表明，在太阳活动的各种指标和太阳的重心运动之间存在着诱人但未经证实的联系。后者的例子是规则和更无序的运动之间的过渡，由巨行星的运动调制，以及罕见的负轨道角动量逆行运动。对系外行星宿主恒星的重心运动及其恒星活动周期的研究，有可能通过确定其他行星系中是否存在这种相关性，证明或反驳太阳运动是短期和长期太阳变率指数复杂模式中的一个基本因素。根据行星的数量、质量和轨道，展示了系外行星宿主恒星的各种复杂的重心运动模式。每一种被认为与太阳活动相关的行为类型在系外行星的宿主恒星中也很明显：受到大质量多行星影响的重复模式，轨道角动量快速变化的时期，以及负轨道角动量的间隔。这项研究为广泛研究但未经证实的太阳运动与太阳活动的各种指标有关的独立调查提供了基础。我们发现，由于其重心运动的性质，宿主星HD 168443和HD 74156提供了特别强大的测试这一假设。

英文摘要：

Empirical evidence suggests a tantalising but unproven link between various indicators of solar activity and the barycentric motion of the Sun. The latter is exemplified by transitions between regular and more disordered motion modulated by the motions of the giant planets, and rare periods of retrograde motion with negative orbital angular momentum. An examination of the barycentric motion of exoplanet host stars, and their stellar activity cycles, has the potential of proving or disproving the Sun's motion as an underlying factor in the complex patterns of short- and long-term solar variability indices, by establishing whether such correlations exist in other planetary systems. A variety of complex patterns of barycentric motions of exoplanet host stars is demonstrated, depending on the number, masses and orbits of the planets. Each of the behavioural types proposed to correlate with solar activity are also evident in exoplanet host stars: repetitive patterns influenced by massive multiple planets, epochs of rapid change in orbital angular momentum, and intervals of negative orbital angular momentum. The study provides the basis for independent investigations of the widely-studied but unproven suggestion that the Sun's motion is somehow linked to various indicators of solar activity. We show that, because of the nature of their barycentric motions, the host stars HD168443 and HD74156 offer particularly powerful tests of this hypothesis.

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