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arXiv 0709.1137astro-ph
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在HD 189733系统中寻找超级地球:在Most天基测光中寻找凌日

Looking for Super-Earths in the HD 189733 System: A Search for Transits in Most Space-Based Photometry

Bryce Croll, Jaymie M. Matthews, Jason F. Rowe, Brett Gladman, Eliza Miller-Ricci, Dimitar Sasselov, Gordon A. H. Walker, Rainer Kuschnig, Douglas N. C. Lin, Da… 展开作者

Bryce Croll, Jaymie M. Matthews, Jason F. Rowe, Brett Gladman, Eliza Miller-Ricci, Dimitar Sasselov, Gordon A. H. Walker, Rainer Kuschnig, Douglas N. C. Lin, David B. Guenther, Anthony F. J. Moffat, Slavek M. Rucinski, Werner W. Weiss

摘要:

我们已经在HD 189733系统中对太阳系外行星进行了全面的凌日搜索,该搜索基于2006年MOST(恒星的微变和振荡)卫星获得的21天几乎不间断的宽带光学测光。我们已经搜索了这些数据,以寻找来自已知热木星HD 189733 b以外的系外行星的真实边缘变暗的凌日,其周期从0.4天到一周不等。通过对数据进行蒙特卡洛统计测试,并将合成凌日插入数据集,我们可以排除其他尺寸在0.15 - 0.31 RJ(木星半径)或1.7 - 3.5 RE(地球半径)之间的系外行星,其轨道平面接近HD 189733 b。这些无效的结果限制了理论,即由于热木星的向内迁移,在类似HD 189733 b的轨道上调用较低质量的热超级地球和热海王星行星。这项工作也说明了在色球活动恒星周围发现较小的凌日行星的可行性。

英文摘要:

We have made a comprehensive transit search for exoplanets down to ~1.5 - 2 Earth radii in the HD 189733 system, based on 21-days of nearly uninterrupted broadband optical photometry obtained with the MOST (Microvariability & Oscillations of STars) satellite in 2006. We have searched these data for realistic limb-darkened transits from exoplanets other than the known hot Jupiter, HD 189733b, with periods ranging from about 0.4 days to one week. Monte Carlo statistical tests of the data with synthetic transits inserted into the data-set allow us to rule out additional close-in exoplanets with sizes ranging from about 0.15 - 0.31 RJ (Jupiter radii), or 1.7 - 3.5 RE (Earth radii) on orbits whose planes are near that of HD 189733b. These null results constrain theories that invoke lower-mass hot Super-Earth and hot Neptune planets in orbits similar to HD 189733b due to the inward migration of this hot Jupiter. This work also illustrates the feasibility of discovering smaller transiting planets around chromospherically active stars.

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