异常偏心系外行星HD 80606 b的Transit入口和倾斜轨道
The Transit Ingress and the Tilted Orbit of the Extraordinarily Eccentric Exoplanet HD 80606b
摘要：
我们提出了一个横贯大陆的运动，观察2009年6月5日过境的系外行星HD 80606 b的结果。我们报告了第一次检测到的过境入境，揭示了过境持续时间为11.64 +/- 0.25小时，并允许更强大的系统参数的测定。在中星时获得的凯克光谱表现出异常的蓝移，给出了恒星自旋轴和行星轨道轴未对准的明确证据。Keck数据显示，预计自旋轨道角在32-87度之间，置信度为68.3%，在14-142度之间，置信度为99.73%。因此，这颗行星的轨道不仅是高度偏心的（e=0.93），而且也是偏离母恒星赤道平面的。根据行星的偏心轨道是由Kozai机制引起的想法，预测了一个大的倾斜。独立于该理论，值得注意的是，所有3个已知自旋轨道不对准的系外行星系统都有偏心轨道上的大质量行星，这表明这些系统的迁移方式与圆形轨道上的低质量行星不同。
英文摘要：
We present the results of a transcontinental campaign to observe the 2009 June 5 transit of the exoplanet HD 80606b. We report the first detection of the transit ingress, revealing the transit duration to be 11.64 +/- 0.25 hr and allowing more robust determinations of the system parameters. Keck spectra obtained at midtransit exhibit an anomalous blueshift, giving definitive evidence that the stellar spin axis and planetary orbital axis are misaligned. The Keck data show that the projected spin-orbit angle is between 32-87 deg with 68.3% confidence and between 14-142 deg with 99.73% confidence. Thus the orbit of this planet is not only highly eccentric (e=0.93), but is also tilted away from the equatorial plane of its parent star. A large tilt had been predicted, based on the idea that the planet's eccentric orbit was caused by the Kozai mechanism. Independently of the theory, it is noteworthy that all 3 exoplanetary systems with known spin-orbit misalignments have massive planets on eccentric orbits, suggesting that those systems migrate differently than lower-mass planets on circular orbits.
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