CHARACTERIZING THE COOL KOIs. II. THE M DWARF KOI-254 AND ITS HOT JUPITER
CHARACTERIZING THE COOL KOIs. II. THE M DWARF KOI-254 AND ITS HOT JUPITER
复制标题
描述酷炫锦鲤的特征。
DOI：
10.1088/0004-6256/143/5/111
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
J. Lloyd
中科院分区：
文献类型：
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作者：
J. Johnson;J. Johnson;J. Gazak;K. Apps;P. Muirhead;J. Crepp;I. Crossfield;T. Boyajian;K. V. Braun;B. Rojas;A. Howard;K. Covey;E. Schlawin;K. Hamren;T. Morton;G. Marcy;J. Lloyd
我们报告了一颗每2.455239天围绕M矮星KOI-254运行的凌日气体巨行星的确认和特征，这颗行星最初是由开普勒任务发现的。我们使用径向速度测量、自适应光学成像和近红外光谱来确认凌日事件的行星性质。KOI-254 b是在m型矮星周围发现的第一颗热木星。我们还提出了一种新的模型无关的方法，使用宽带光度法来估计M矮星的质量和金属丰度，而不依赖于直接的距离测量。该方法包括一种新的基于J−K色的光度金属量校准方法。我们使用这种技术来测量KOI-254及其行星的物理性质。我们测量的行星质量MP = 0.505 MJup，半径RP = 0.96 RJup，半长轴a = 0.030 AU，基于我们测量的恒星质量M -百科= 0.59 M☉，半径R -百科= 0.55 R☉。我们还发现主恒星富含金属，这与已知拥有巨行星的m型恒星样本一致。
We report the confirmation and characterization of a transiting gas giant planet orbiting the M dwarf KOI-254 every 2.455239 days, which was originally discovered by the Kepler mission. We use radial velocity measurements, adaptive optics imaging, and near-infrared spectroscopy to confirm the planetary nature of the transit events. KOI-254 b is the first hot Jupiter discovered around an M-type dwarf star. We also present a new model-independent method of using broadband photometry to estimate the mass and metallicity of an M dwarf without relying on a direct distance measurement. Included in this methodology is a new photometric metallicity calibration based on J − K colors. We use this technique to measure the physical properties of KOI-254 and its planet. We measure a planet mass of MP = 0.505 MJup, radius RP = 0.96 RJup, and semimajor axis a = 0.030 AU, based on our measured stellar mass M⋆ = 0.59 M☉ and radius R⋆ = 0.55 R☉. We also find that the host star is metal-rich, which is consistent with the sample of M-type stars known to harbor giant planets.