Demarcating Circulation Regimes of Synchronously Rotating Terrestrial Planets within the Habitable Zone
Demarcating Circulation Regimes of Synchronously Rotating Terrestrial Planets within the Habitable Zone
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DOI：
10.3847/1538-4357/aa9f1f
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发表时间：
2018-01-10
影响因子：
4.9
通讯作者：
Kopparapu, Ravi Kumar
中科院分区：
文献类型：
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作者：
Haqq-Misra, Jacob;Wolf, Eric. T.;Kopparapu, Ravi Kumar
我们使用共同体大气模型研究了低质量恒星宜居带内同步自转类地行星的大气动力学。昼夜半球之间的表面温度差异随着入射恒星通量的增加而减小，这与气体巨星的趋势相反。我们定义了三个动力学制度的赤道Rossby变形半径和莱茵长度。慢自转区的平均纬向环流从昼面延伸到夜面，这种情况发生在有效温度为3300-4500 K（自转周期>20天）的恒星周围的行星上，其中罗斯比变形半径和莱茵长度都超过行星半径。快速旋转体有一个平均的纬向环流，部分跨越半球，并在亚恒星点下方形成带状云，这种情况发生在围绕有效温度低于3000 K（旋转周期）的恒星运行的行星上
We investigate the atmospheric dynamics of terrestrial planets in synchronous rotation within the habitable zone of low-mass stars using the Community Atmosphere Model. The surface temperature contrast between the day and night hemispheres decreases with an increase in incident stellar flux, which is opposite the trend seen in gas giants. We define three dynamical regimes in terms of the equatorial Rossby deformation radius and the Rhines length. The slow rotation regime has a mean zonal circulation that spans from the day to the night sides, which occurs for planets around stars with effective temperatures of 3300-4500 K (rotation period >20 days), with both the Rossby deformation radius and the Rhines length exceeding the planetary radius. Rapid rotators have a mean zonal circulation that partially spans a hemisphere and with banded cloud formation beneath the substellar point, which occurs for planets orbiting stars with effective temperatures of less than 3000 K (rotation period