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arXiv 0905.4727astro-ph.EPastro-ph.SR
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系外行星系统HD 17156中Rossiter-McLaughlin效应的改进测量

Improved Measurement of the Rossiter-McLaughlin Effect in the Exoplanetary System HD 17156

Norio Narita, Teruyuki Hirano, Bun'ei Sato, Joshua N. Winn, Yasushi Suto, Edwin L. Turner, Wako Aoki, Motohide Tamura, Toru Yamada

摘要:

我们提出了一个改进的测量Rossiter-McLaughlin效应的系外行星系统HD 17156,根据径向速度数据收集与斯巴鲁8.2米望远镜在整个行星过境UT 2008年11月7日。这些数据允许精确和独立地确定该系统的投影自旋轨道角:$λ= 10.0^{\circ} \pm 5.1^{\circ}$。该结果取代了Narita等人先前关于$λ= 62^{\circ} \pm 25^{\circ}$的声明,这是基于低精度的数据和糟糕的统计数据。因此,HD 17156系统的恒星自旋和行星轨道轴很可能是对齐的,尽管行星的大轨道偏心率表明了强烈的动力学相互作用的历史。

英文摘要:

We present an improved measurement of the Rossiter-McLaughlin effect for the exoplanetary system HD 17156, based on radial-velocity data gathered with the Subaru 8.2m telescope throughout the planetary transit of UT 2008 November 7. The data allow for a precise and independent determination of the projected spin-orbit angle of this system: $λ= 10.0^{\circ} \pm 5.1^{\circ}$. This result supersedes the previous claim of $λ= 62^{\circ} \pm 25^{\circ}$ by Narita et al., which was based on lower-precision data with poor statistics. Thus the stellar spin and planetary orbital axes of the HD 17156 system are likely to be well-aligned, despite the planet's large orbital eccentricity suggesting a history of strong dynamical interactions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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