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arXiv 1310.7101astro-ph.EP
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HD 82943多行星系统之谜的可能解决方案:三行星共振1:2:5?

Possible solution to the riddle of HD 82943 multiplanet system: the three-planet resonance 1:2:5?

Roman V. Baluev, Cristian Beaugé

摘要:

我们对行星宿主星HD 82943的径向速度数据进行了新的分析。我们包括最近的Keck/HIRES测量以及老化但数量更多的CORALIE数据。我们发现,CORALIE径向速度测量污染的一个系统的年度变化,影响了许多以前的结果的鲁棒性。我们发现,清除这种变化后,残差仍然包含一个明确的签名,一个额外的$\sim 1100$天的周期性。后一种变化在我们分析的所有三个独立的径向速度子集中留下了重要的线索:CORALIE数据,硬件升级前获得的Keck数据,以及升级后获得的Keck数据。我们主要将这种变化视为系统中第三颗行星的特征,尽管我们不能排除其他解释,例如长期的恒星活动。我们发现很容易自然地获得一个稳定的三行星径向速度拟合接近三行星平均运动共振1:2:5,其中两个主要行星(1:2共振)在一个对齐的近点共转。第三颗行星的动力学状态仍然不确定:它可能位于5:2共振中,也可能稍微超出5:2共振。在偏心参数不确定的情况下,得到了$\sim 1075$的轨道周期和最小质量的周期值,以及$\sim 0.3 M_{\rm Jup}$的最小质量值。

英文摘要:

We carry out a new analysis of the published radial velocity data for the planet-hosting star HD82943. We include the recent Keck/HIRES measurements as well as the aged but much more numerous CORALIE data. We find that the CORALIE radial velocity measurements are polluted by a systematic annual variation which affected the robustness of many previous results. We show that after purging this variation, the residuals still contain a clear signature of an additional $\sim 1100$ days periodicity. The latter variation leaves significant hints in all three independent radial velocity subsets that we analysed: the CORALIE data, the Keck data acquired prior to a hardware upgrade, and the Keck data taken after the upgrade. We mainly treat this variation as a signature of a third planet in the system, although we cannot rule out other interpretations, such as long-term stellar activity. We find it easy to naturally obtain a stable three-planet radial-velocity fit close to the three-planet mean-motion resonance 1:2:5, with the two main planets (those in the 1:2 resonance) in an aligned apsidal corotation. The dynamical status of the third planet is still uncertain: it may reside in as well as slightly out of the 5:2 resonance. We obtain the value of $\sim 1075$ days for its orbital period and of $\sim 0.3 M_{\rm Jup}$ for its minimum mass, while the eccentric parameters are uncertain.

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