Characterization of the planetary system Kepler-101 with HARPS-N A hot super-Neptune with an Earth-sized low-mass companion
Characterization of the planetary system Kepler-101 with HARPS-N A hot super-Neptune with an Earth-sized low-mass companion
复制标题
用 HARPS-N 表征行星系统 Kepler-101 一颗热的超级海王星，带有一个地球大小的低质量伴星
DOI：
10.1051/0004-6361/201424617
复制
发表时间：
2014
影响因子：
6.5
通讯作者：
Bonomo A
中科院分区：
文献类型：
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作者：
Bonomo A
我们通过对开普勒数据和 HARPS-N 摄谱仪获得的 40 个径向速度进行组合差分演化马尔可夫链蒙特卡罗分析来表征行星系统 Kepler-101。该系统之前已经过验证，由一颗炽热的超级海王星 Kepler-101b 和一颗地球大小的行星 Kepler-101c 组成。这两颗行星分别需要 3.49 和 6.03 天围绕稍微进化且富含金属的 G 型恒星运行。 Kepler-101b 的质量Mp= 51.1-4.7+ 5.1M⊕，半径Rp= 5.77-0.79+ 0.85R⊕，密度ρp= 1.45-0.48+ 0.83g cm-3，是第一个完全表征的超级海王星，其密度表明重元素在其内部构成了很大一部分；占其总质量的60%以上。 Kepler-101c 的半径为 1.25-0.17+ 0.19R⊕，这意味着不存在任何 H/He 包层，但由于母星对于高精度径向速度测量（Kp= 13.8）的相对微弱以及径向速度数量有限，因此无法确定其质量。 1σ 上限，Mp< 3.8M⊕，排除纯铁成分的概率为 68.3%。行星系统 Kepler-101 的结构——包含一颗近距离巨行星和一颗周期比略大于 3:2 共振的地球大小的外行星——对于行星形成和演化的场景来说无疑是令人感兴趣的。该系统没有遵循之前报道的趋势，即在大多数与至少一颗海王星大小或更大的行星成对的开普勒系统中，较大的行星具有较长的周期。
We characterize the planetary system Kepler-101 by performing a combined differential evolution Markov chain Monte Carlo analysis ofKeplerdata and forty radial velocities obtained with the HARPS-N spectrograph. This system was previously validated and is composed of a hot super-Neptune, Kepler-101b, and an Earth-sized planet, Kepler-101c. These two planets orbit the slightly evolved and metal-rich G-type star in 3.49 and 6.03 days, respectively. With massMp= 51.1-4.7+ 5.1M⊕, radiusRp= 5.77-0.79+ 0.85R⊕, and densityρp= 1.45-0.48+ 0.83g cm-3, Kepler-101b is the first fully characterized super-Neptune, and its density suggests that heavy elements make up a significant fraction of its interior; more than 60% of its total mass. Kepler-101c has a radius of 1.25-0.17+ 0.19R⊕, which implies the absence of any H/He envelope, but its mass could not be determined because of the relative faintness of the parent star for highly precise radial-velocity measurements (Kp= 13.8) and the limited number of radial velocities. The 1σupper limit,Mp< 3.8M⊕, excludes a pure iron composition with a probability of 68.3%. The architecture of the planetary system Kepler-101 − containing a close-in giant planet and an outer Earth-sized planet with a period ratio slightly larger than the 3:2 resonance − is certainly of interest for scenarios of planet formation and evolution. This system does not follow thepreviously reported trend that the larger planet has the longer period in the majority ofKeplersystems of planet pairs with at least one Neptune-sized or larger planet.