系外行星HAT-P-1b自旋轨道角的测量
Measurement of the Spin-Orbit Angle of Exoplanet HAT-P-1b
摘要：
我们提出了新的光谱和光度观测的HAT-P-1行星系统。在三次凌日期间获得的光谱显示出罗西特-麦克劳克林效应，使我们能够测量恒星自旋轴和轨道法线的天空投影之间的角度，λ= 3.7 +/- 2.1度。这个系统和其他系统的λ值都很小，这表明主导行星的迁移机制保持了自旋-轨道对齐。使用两个新的凌日光变曲线，我们改进了凌日星历，并减少了一个数量级的轨道周期的不确定性。我们发现一个上限的轨道偏心率为0.067，99%的置信度，结合我们的新的径向速度测量与以前获得的。
英文摘要：
We present new spectroscopic and photometric observations of the HAT-P-1 planetary system. Spectra obtained during three transits exhibit the Rossiter-McLaughlin effect, allowing us to measure the angle between the sky projections of the stellar spin axis and orbit normal, λ= 3.7 +/- 2.1 degrees. The small value of λfor this and other systems suggests that the dominant planet migration mechanism preserves spin-orbit alignment. Using two new transit light curves, we refine the transit ephemeris and reduce the uncertainty in the orbital period by an order of magnitude. We find a upper limit on the orbital eccentricity of 0.067, with 99% confidence, by combining our new radial-velocity measurements with those obtained previously.
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