Spin-orbit measurements and refined parameters for the exoplanet systems WASP-22 and WASP-26
Spin-orbit measurements and refined parameters for the exoplanet systems WASP-22 and WASP-26
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DOI：
10.1051/0004-6361/201117597
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发表时间：
2011-06
影响因子：
6.5
通讯作者：
D. Anderson;A. Cameron;M. Gillon;C. Hellier;E. Jehin;M. Lendl;D. Queloz;B. Smalley;A. Triaud;M. Vanhuysse
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文献类型：
--
作者：
D. Anderson;A. Cameron;M. Gillon;C. Hellier;E. Jehin;M. Lendl;D. Queloz;B. Smalley;A. Triaud;M. Vanhuysse
我们报告了通过系外行星WASP-22 b和WASP-26 b的凌日进行的光谱和光度观测，旨在确定系统的自旋轨道角。我们将这些数据与现有数据联合收割机结合起来以细化系统参数。我们测量到WASP-22 b的天空投影自旋轨道角为22± 16 °，显示行星的轨道是倾斜的，也许有轻微的错位。由于WASP-26 b的振幅和观测噪声较低，我们没有检测到Rossiter-McLaughlin效应。我们对WASP-22 b和WASP-26 b的轨道偏心率分别设定了0.063和0.050的3-σ上限。在对Maxted等人（2010，AJ，140，2007）发现的WASP-22系统速度漂移进行修正后，我们发现该系统中的第三体的最小质量为5.3± 0.3 MJup（a3/5 Au）2，其中a3是第三体的轨道距离。
We report on spectroscopic and photometric observations through transits of the exoplanets WASP-22b and WASP-26b, intended to determine the systems’ spin-orbit angles. We combine these data with existing data to refine the system parameters. We me asure a sky-projected spin-orbit angle of 22± 16 ◦ for WASP-22b, showing the planet’s orbit to be prograde and, perhaps, slightly misaligned. We do not detect the Rossiter-McLaughlin effect of WASP-26b due to its low amplitude and observation noise. We place 3-σ upper limits on orbital eccentricity of 0.063 for WASP-22b and 0.050 for WASP-26b. After refining the drift in the systemic velo city of WASP-22 found by Maxted et al. (2010, AJ, 140, 2007), we find th e third body in the system to have a minimum-mass of 5.3± 0.3 MJup (a3/5 AU) 2 , where a3 is the orbital distance of the third body.