55 Cancri e气候与热力位相曲线的连接
Linking the Climate and Thermal Phase Curve of 55 Cancri e
摘要：
巨蟹座55 e的热相位曲线是对潮汐锁定的超级地球温度分布的第一次测量，但提出了一些关于行星气候的令人困惑的问题。相位曲线具有高的振幅和峰值偏移，这表明它有一个显着的热点东移，以及大的昼夜温度对比度。我们使用一个大气环流模型来模拟潜在的气候，并调查散装大气成分和这些看似矛盾的功能的大小之间的关系。我们确认潮汐锁环流的理论模型与我们的数值模式55 Cnc e是一致的，并排除了某些大气成分的基础上，他们的热力学性质。我们的最佳拟合大气具有显著的热点偏移和昼夜对比度，尽管这些没有观测到的相位曲线那么大。我们讨论了可能的物理过程，可以解释的意见，并表明，夜侧云形成的物种，如SiO从一天侧岩浆海洋可能会增加相位曲线振幅和解释的意见。我们的结论是，观测可以解释一个光学厚的大气，低的平均分子量，几巴的表面压力和一个强大的东向环流，与夜侧云的形成可能的解释我们的模型和观测之间的差异。
英文摘要：
The thermal phase curve of 55 Cancri e is the first measurement of the temperature distribution of a tidally locked Super-Earth, but raises a number of puzzling questions about the planet's climate. The phase curve has a high amplitude and peak offset, suggesting that it has a significant eastward hot-spot shift as well as a large day-night temperature contrast. We use a general circulation model to model potential climates, and investigate the relation between bulk atmospheric composition and the magnitude of these seemingly contradictory features. We confirm theoretical models of tidally locked circulation are consistent with our numerical model of 55 Cnc e, and rule out certain atmospheric compositions based on their thermodynamic properties. Our best-fitting atmosphere has a significant hot-spot shift and day-night contrast, although these are not as large as the observed phase curve. We discuss possible physical processes which could explain the observations, and show that night-side cloud formation from species such as SiO from a day-side magma ocean could potentially increase the phase curve amplitude and explain the observations. We conclude that the observations could be explained by an optically thick atmosphere with a low mean molecular weight, a surface pressure of several bar and a strong eastward circulation, with night-side cloud formation a possible explanation for the difference between our model and the observations.
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