CONFIRMATION OF A RETROGRADE ORBIT FOR EXOPLANET WASP-17b

CONFIRMATION OF A RETROGRADE ORBIT FOR EXOPLANET WASP-17b
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确认系外行星 WASP-17b 的逆行轨道

DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
P. Sackett
P. Sackett
中科院分区：
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文献类型：
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作者：
D. Bayliss;J. Winn;R. Mardling;P. Sackett

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我们提出了高精度的径向速度观测WASP-17整个过境的近距离巨行星，使用MIKE光谱仪上的6.5米麦哲伦望远镜在拉斯坎帕纳斯天文台。通过模拟Rossiter-McLaughlin效应，我们发现天空投射的自旋轨道角为λ = 167.4 ± 11.2度。这独立地证实了之前的发现，即WASP-17 b处于逆行轨道上，这表明它通过一种机制进行迁移，而不仅仅是行星和磁盘之间的引力相互作用。有趣的是，我们对λ的结果与先前宣布的值相差45 ± 13度，并且我们还发现光谱凌日发生的时间比基于公布的星历表的预期早15 ± 5分钟。星历表中的差异突出表明，只要有可能，就需要同时进行分光和光度凌日观测。
We present high-precision radial velocity observations of WASP-17 throughout the transit of its close-in giant planet, using the MIKE spectrograph on the 6.5 m Magellan Telescope at Las Campanas Observatory. By modeling the Rossiter–McLaughlin effect, we find the sky-projected spin–orbit angle to be λ = 167.4 ± 11.2 deg. This independently confirms the previous finding that WASP-17b is on a retrograde orbit, suggesting it underwent migration via a mechanism other than just the gravitational interaction between the planet and the disk. Interestingly, our result for λ differs by 45 ± 13 deg from the previously announced value, and we also find that the spectroscopic transit occurs 15 ± 5 minutes earlier than expected, based on the published ephemeris. The discrepancy in the ephemeris highlights the need for contemporaneous spectroscopic and photometric transit observations whenever possible.
WASP-17b: AN ULTRA-LOW DENSITY PLANET IN A PROBABLE RETROGRADE ORBIT
DOI： 10.1088/0004-637x/709/1/159
发表时间： 2009-08
期刊： The Astrophysical Journal
影响因子： --
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混沌恒星的形成以及恒星旋转与盘和行星轨道轴的对齐
DOI： 10.1111/j.1365-2966.2009.15773.x
发表时间： 2010
期刊： Monthly Notices of the Royal Astronomical Society
影响因子： 4.8
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通讯作者： Bate M