The retrograde orbit of the HAT-P-6b exoplanet
The retrograde orbit of the HAT-P-6b exoplanet
复制标题
HAT-P-6b系外行星的逆行轨道
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
A. Vidal
中科院分区：
文献类型：
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作者：
G. Hébrard;D. Ehrenreich;F. Bouchy;X. Delfosse;C. Moutou;L. Arnold;I. Boisse;X. Bonfils;R. Díaz;A. Eggenberger;T. Forveille;A. Lagrange;C. Lovis;F. Pepe;C. Perrier;D. Queloz;A. Santerne;N. Santos;D. Ségransan;S. Udry;A. Vidal
我们用SOPHIE摄谱仪（OHP，法国）观测到HAT-P-6 b系外行星穿过其宿主星星的凌日。由此产生的恒星径向速度显示罗西特-麦克劳克林异常，并揭示了逆行轨道：行星轨道自旋和恒星旋转自旋指向大致相反的方向。对异常的拟合测量这两个自旋轴之间的天空投影角λ = 166 +/-10度。所有七颗已知的逆行行星都是热木星，质量为M_p4 M_Jup），它们是平行的，但没有对齐。因此，不同的机制可能是负责行星的曲率高于和低于3.5 M_Jup。
We observed with the SOPHIE spectrograph (OHP, France) the transit of the HAT-P-6b exoplanet across its host star. The resulting stellar radial velocities display the Rossiter-McLaughlin anomaly and reveal a retrograde orbit: the planetary orbital spin and the stellar rotational spin point towards approximately opposite directions. A fit to the anomaly measures a sky-projected angle lambda = 166 +/- 10 degrees between these two spin axes. All seven known retrograde planets are hot jupiters with masses M_p 4 M_Jup) are prograde but misaligned. Different mechanisms may therefore be responsible for planetary obliquities above and below ~3.5 M_Jup.