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arXiv 1105.3849astro-ph.EP
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系外行星系统HAT-P-8、HAT-P-9、HAT-P-16和HAT-P-23的自旋轨道倾角

Spin-orbit inclinations of the exoplanetary systems HAT-P-8, HAT-P-9, HAT-P-16 and HAT-P-23

Claire Moutou, Rodrigo F. Diaz, Stephane Udry, Guillaume Hebrard, Francois Bouchy, Alexandre Santerne, David Ehrenreich, Luc Arnold, Isabelle Boisse, Xavier Bon… 展开作者

Claire Moutou, Rodrigo F. Diaz, Stephane Udry, Guillaume Hebrard, Francois Bouchy, Alexandre Santerne, David Ehrenreich, Luc Arnold, Isabelle Boisse, Xavier Bonfils, Xavier Delfosse, Anne Eggenberger, Thierry Forveille, Anne-Marie Lagrange, Christophe Lovis, Patrick Martinez, Francesco Pepe, Christian Perrier, Didier Queloz, Nuno C. Santos, Damien Segransan, Dominique Toublanc, Jean-Pierre Troncin, Michael Vanhuysse, Alfred Vidal-Madjar

摘要:

我们报告了太阳系外行星HAT-P-8 b,HAT-P-9 b,HAT-P-16 b和HAT-P-23 b的自旋轨道角的测量,这要归功于上普罗旺斯天文台在1.93米望远镜上使用SOPHIE光谱仪进行的光谱观测。罗西特-麦克劳克林效应的径向速度测量表明,所有系统都检测到了一个明显的平行排列的轨道。投影的自旋轨道角为λ =-17度对于HAT-P-8、HAT-P-9、HAT-P-16和HAT-P-23,分别为(+9.2,-11.5),-16度(8),-10度(16),+15度(22),相应的投影旋转速度为14.5(0.8)、12.5(1.8)、3.9(0.8)和7.8(1.6)km/s。这些新的结果增加到37个准确测量的自旋轨道角凌日系外系统。最后,我们绘制了一个初步的全球性的行为的轨道碰撞,涉及的复杂性和多样性的可能机制。

英文摘要:

We report the measurement of the spin-orbit angle of the extra-solar planets HAT-P-8 b, HAT-P-9 b, HAT-P-16 b and HAT-P-23 b, thanks to spectroscopic observations performed at the Observatoire de Haute-Provence with the SOPHIE spectrograph on the 1.93-m telescope. Radial velocity measurements of the Rossiter-McLaughlin effect show the detection of an apparent prograde, aligned orbit for all systems. The projected spin-orbit angles are found to be lambda=-17 deg (+9.2,-11.5), -16 deg (8), -10 deg (16), +15 deg (22) for HAT-P-8, HAT-P-9, HAT-P-16 and HAT-P-23 respectively, with corresponding projected rotational velocities of 14.5 (0.8), 12.5 (1.8), 3.9 (0.8), and 7.8 (1.6) km/s. These new results increase to 37 the number of accurately measured spin-orbit angles in transiting extrasolar systems. We conclude by drawing a tentative picture of the global behaviour of orbital alignement, involving the complexity and diversity of possible mechanisms.

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