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arXiv 0907.2956astro-ph.EP
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CoRoT-3b和HD189733b的Rossiter-McLaughlin效应

The Rossiter-McLaughlin effect of CoRoT-3b & HD189733b

Amaury H. M. J. Triaud, Didier Queloz, Francois Bouchy, Claire Moutou, Andrew Collier Cameron, Antonio Claret, Pierre Barge, Willy Benz, Magali Deleuil, Tristan… 展开作者

Amaury H. M. J. Triaud, Didier Queloz, Francois Bouchy, Claire Moutou, Andrew Collier Cameron, Antonio Claret, Pierre Barge, Willy Benz, Magali Deleuil, Tristan Guillot, Guillaume Hébrard, Alain Lecavelier des Étangs, Christophe Lovis, Michel Mayor, Francesco Pepe, Stéphane Udry

摘要:

我们提出了径向速度序列期间获得的三个过境的系外行星HD 189733 b和一个过境的CoRoT-3b。我们对这些恒星的光谱和光度数据进行了马尔可夫链蒙特卡罗分析,以确定一套完整的系统参数,包括HD 189733 b的项目自旋轨道错位角,通过Rossiter-McLaughlin效应达到前所未有的精度:beta = 0.85度(+0.32 -0.28)。行星轨道的这种小但非零的倾角对于理解系统的起源很重要。在CoRoT-3b上,结果似乎也指向非零倾角,β = 37.6度(+10.0 -22.3),但这仍然是边缘性的。由于非高斯交叉关联函数的系统效应似乎是重要的残差的主要原因,防止准确测定的投影恒星自转速度V sin(I)的两颗恒星。

英文摘要:

We present radial-velocity sequences acquired during three transits of the exoplanet HD 189733b and one transit of the CoRoT-3b. We applied a combined Markov-Chain Monte Carlo analysis of spectroscopic and photometric data on these stars, to determine a full set of system parameters including the project spin-orbit misalignement angle of HD 189733b to an unprecedented precision via the Rossiter-McLaughlin effect: beta = 0.85 degrees (+0.32 -0.28) . This small but non-zero inclination of the planetary orbit is important to understand the origin of the system. On CoRoT-3b, results seem to point towards a non-zero inclination as well with beta = 37.6 degrees (+10.0 -22.3), but this remains marginal. Systematic effects due to non-gaussian cross-correlation functions appear to be the main cause of significant residuals that prevent an accurate determination of the projected stellar rotation velocity V sin(I) for both stars.

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