Observational consequences of the recently proposed Super-Earth orbiting GJ 436

Observational consequences of the recently proposed Super-Earth orbiting GJ 436
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最近提出的超级地球轨道 GJ 436 的观测结果

DOI:
10.1051/0004-6361:200810278
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发表时间:
2008
影响因子:
6.5
通讯作者:
Seifahrt
Seifahrt
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Seifahrt

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Ribas和他的合作者最近提出,另外有一颗约5颗行星围绕着凌日行星的宿主星星GJ 436运行。这两颗行星之间的长期动力学相互作用导致了偏心率的激发,这可能为凌日行星出乎意料的大轨道偏心率提供了一个解释。我们研究是否存在这样的第二颗行星是由现有的观测数据时,将导致其存在的短期相互作用的支持。我们发现,里巴斯和合作者提出的系统模型导致的预测是强烈不一致的测量主机星星径向速度,过境行星的主要和次要的日食时间,过境行星的轨道倾角。寻找一个与数据一致的替代两行星模型产生了许多看似合理的解决方案,尽管没有一个特别独特的解决方案比名义上的单行星模型更适合数据。我们的结论是,Ribas和合作者关于GJ 436系统中存在另一颗短周期行星的一般假设仍然是合理的,但没有足够的证据支持他们发现行星的说法。
Ribas and collaborators have recently proposed that an additional, ~5  planet orbits the transiting planet host star GJ 436. Long-term dynamical interactions between the two planets leading to eccentricity excitation might provide an explanation for the transiting planet's unexpectedly large orbital eccentricity. We examine whether the existence of such a second planet is supported by the available observational data when the short-term interactions that would result from its presence are accounted for. We find that the model for the system suggested by Ribas and collaborators lead to predictions that are strongly inconsistent with the measured host star radial velocities, transiting planet primary and secondary eclipse times, and transiting planet orbital inclinations. A search for an alternative two planet model that is consistent with the data yields a number of plausible solutions, although no single one stands out as particularly unique by giving a significantly better fit to the data than the nominal single planet model. We conclude that Ribas and collaborator's general hypothesis of an additional short-period planet in the GJ 436 system is still plausible, but that there is not sufficient evidence to support their claim of a planet detection.
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影响因子: --
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DOI: 10.1086/509910
发表时间: 2006
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影响因子: --
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DOI: 10.1086/319847
发表时间: 2001
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影响因子: --
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