KEPLER-63b: A GIANT PLANET IN A POLAR ORBIT AROUND A YOUNG SUN-LIKE STAR
KEPLER-63b: A GIANT PLANET IN A POLAR ORBIT AROUND A YOUNG SUN-LIKE STAR
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DOI：
10.1088/0004-637x/775/1/54
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发表时间：
2013-07
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通讯作者：
R. Sanchis-Ojeda;J. Winn;G. Marcy;A. Howard;H. Isaacson;J. Johnson;G. Torres;S. Albrecht;T. Campante;W. Chaplin;G. Davies;Mikkel Lund;J. Carter;R. Dawson;L. Buchhave;M. Everett;D. Fischer;J. Geary;R. Gilliland;E. Horch;S. Howell;D. Latham
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作者：
R. Sanchis-Ojeda;J. Winn;G. Marcy;A. Howard;H. Isaacson;J. Johnson;G. Torres;S. Albrecht;T. Campante;W. Chaplin;G. Davies;Mikkel Lund;J. Carter;R. Dawson;L. Buchhave;M. Everett;D. Fischer;J. Geary;R. Gilliland;E. Horch;S. Howell;D. Latham
我们提出了一个巨大的行星的发现和特征，围绕着年轻的类太阳恒星开普勒-63 （KOI-63, mKp = 11.6, Teff = 5576 K, M - - = 0.98 M☉）。这颗行星每9.43天运行一次，有明显的深度变化和由大恒星黑子引起的变亮异常。根据凌日光曲线和估计的恒星参数，这颗行星的半径为6.1±0.2 R⊕。由于恒星的高度活跃，现有的径向速度数据无法测量这颗行星的质量，但如果我们假设它是一个圆形轨道，那么我们可以给出一个粗略的120 M⊕(3σ)的上限。根据罗西特-麦克劳克林效应和对星点交叉事件的分析，主星有一个高倾角（ψ = 104°）。这个结果是有价值的，因为几乎所有以前的倾角测量都是针对拥有更大质量行星和更短周期轨道的恒星。此外，行星的极地轨道结合对点交叉事件的分析揭示了一个巨大而持久的极星斑。这些黑子以前是用多普勒断层扫描推断出来的，并在模拟年轻的类太阳恒星的磁场活动中得到了预测。
We present the discovery and characterization of a giant planet orbiting the young Sun-like star Kepler-63 (KOI-63, mKp = 11.6, Teff = 5576 K, M⋆ = 0.98 M☉). The planet transits every 9.43 days, with apparent depth variations and brightening anomalies caused by large starspots. The planet's radius is 6.1 ± 0.2 R⊕, based on the transit light curve and the estimated stellar parameters. The planet's mass could not be measured with the existing radial-velocity data, due to the high level of stellar activity, but if we assume a circular orbit, then we can place a rough upper bound of 120 M⊕ (3σ). The host star has a high obliquity (ψ = 104°), based on the Rossiter–McLaughlin effect and an analysis of starspot-crossing events. This result is valuable because almost all previous obliquity measurements are for stars with more massive planets and shorter-period orbits. In addition, the polar orbit of the planet combined with an analysis of spot-crossing events reveals a large and persistent polar starspot. Such spots have previously been inferred using Doppler tomography, and predicted in simulations of magnetic activity of young Sun-like stars.