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arXiv 1004.1809astro-ph.EP
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用SOPHIE新径向速度监测得到的WASP-12和WASP-14的轨道偏心率

Orbital eccentricity of WASP-12 and WASP-14 from new radial-velocity monitoring with SOPHIE

Nawal Husnoo, Frederic Pont, Guillaume Hebrard, Elaine Simpson, Tsevi Mazeh, Francois Bouchy, Claire Moutou, Luc Arnold, Isabelle Boisse, Rodrigo Diaz, Anne Egg… 展开作者

Nawal Husnoo, Frederic Pont, Guillaume Hebrard, Elaine Simpson, Tsevi Mazeh, Francois Bouchy, Claire Moutou, Luc Arnold, Isabelle Boisse, Rodrigo Diaz, Anne Eggenberger, Avi Shporer

摘要:

作为对已知凌日行星进行长期径向速度监测的一部分-旨在测量轨道偏心率、自旋-轨道对准和其他行星伴星-我们获得了两个凌日系统WASP-12和WASP-14的径向速度数据,这两个系统都在近轨道上拥有气态巨星(轨道周期分别为1.09天和2.24天)。在这两种情况下,最初的轨道解都显示出很大的轨道偏心率,WASP-12为0.049+-0.015,WASP-14为0.091+-0.003。从那时起,对WASP-12的二次日食的红外测量表明,偏心率(e cos w)的一个投影非常接近于零,这对初始径向速度轨道的偏心率产生了怀疑。我们的测量证实,初始偏心检测可能是虚假的,并表明径向速度数据是兼容的圆形轨道。考虑到径向速度和光度数据中存在相关系统噪声,MCMC分析给出e=0.017(+0.015-0.011)。通过对比,我们确定了WASP-14的轨道偏心率,并将其值修正为e=0.088+-0.003。因此,WASP-14是目前已知的离地球最近的行星,并且有着确定的偏心轨道。

英文摘要:

As part of the long-term radial velocity monitoring of known transiting planets -- designed to measure orbital eccentricities, spin-orbit alignments and further planetary companions -- we have acquired radial velocity data for the two transiting systems WASP-12 and WASP-14, each harbouring gas giants on close orbits (orbital period of 1.09 and 2.24 days respectively). In both cases, the initial orbital solution suggested a significant orbital eccentricity, 0.049+-0.015 for WASP-12 and 0.091+-0.003 for WASP-14. Since then, measurements of the secondary eclipse of WASP-12 in the infrared have indicated that one projection of the eccentricity (e cos w) was very close to zero, casting doubt on the eccentricity from the initial radial velocity orbit. Our measurements confirm that the initial eccentricity detection could be spurious, and show that the radial velocity data is compatible with a circular orbit. A MCMC analysis taking into account the presence of correlated systematic noise in both the radial velocity and photometric data gives e=0.017 (+0.015-0.011). By contrast, we confirm the orbital eccentricity of WASP-14, and refine its value to e=0.088+-0.003. WASP-14 is thus the closest presently known planet with a confirmed eccentric orbit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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