Photodynamical mass determination of the multiplanetary system K2-19

Photodynamical mass determination of the multiplanetary system K2-19
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多行星系统 K2-19 的光动力质量测定

DOI：
10.1093/mnras/stv2271
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发表时间：
2015
期刊：
Monthly Notices of the Royal Astronomical Society
影响因子：
4.8
通讯作者：
Barros S
Barros S
中科院分区：
物理与天体物理2区
文献类型：
--
作者：
Barros S

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K2-19是K2观测发现的第二个多行星系统。该系统由两颗海王星大小的行星组成，接近3：2的平均运动共振。为了更好地描述系统，我们获得了两个额外的过境观测K2- 19 b和五个额外的径向速度观测。这些与K2数据相结合，并同时与系统动力学（光动力学模型）相拟合，这增加了渡越时间测量的精度。更高的渡越时间精度使我们能够检测到行星动态相互作用的斩波信号，从而使系统具有独特的特征。虽然星星的反射运动没有被探测到，但系统的动力学模型使我们能够得出内行星和外行星的质量分别为Mb = 44 ± 12 M和Mc = 15.9 ± 7.0 M，导致密度接近天王星。我们还表明，我们的方法允许的质量比的推导，仅使用80天的观测在第一个运动的K2。
K2-19 is the second multiplanetary system discovered with K2 observations. The system is composed of two Neptune size planets close to the 3:2 mean-motion resonance. To better characterize the system we obtained two additional transit observations of K2-19b and five additional radial velocity observations. These were combined with K2 data and fitted simultaneously with the system dynamics (photodynamical model) which increases the precision of the transit time measurements. The higher transit time precision allows us to detect the chopping signal of the dynamic interaction of the planets that in turn permits to uniquely characterize the system. Although the reflex motion of the star was not detected, dynamic modelling of the system allowed us to derive planetary masses ofMb= 44 ± 12  M⊕andMc= 15.9 ± 7.0  M⊕for the inner and the outer planets, respectively, leading to densities close to Uranus. We also show that our method allows the derivation of mass ratios using only the 80 d of observations during the first campaign of K2.
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