THE INTERIOR DYNAMICS OF WATER PLANETS
THE INTERIOR DYNAMICS OF WATER PLANETS
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DOI：
10.1088/0004-637x/708/2/1326
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发表时间：
2010-01-10
影响因子：
4.9
通讯作者：
Sasselov, Dimitar D.
中科院分区：
文献类型：
--
作者：
Fu, Roger;O'Connell, Richard J.;Sasselov, Dimitar D.
探测到的超级地球的不断扩大的目录要求在大量水层的情况下对它们的性质进行理论研究。这项工作考虑了这样的水行星，它们具有一定的质量和水质量分数(2-5M地球，0.02%-50%H2O)。首先，我们对冰面和海洋表面的近地表的热力和动力结构进行了建模，找到了预计地球将保持次表层液态海洋的不同区域，以及预计将显示冰川构造的区域。根据对表面温度、热流和重力的估计，新发现的系外行星可能会被置于其中一个区域。其次，我们建立了一个较高冰相下伏冰幔的参数化对流模式，发现从硅酸盐-铁核释放出来的物质应该在0.1到100兆年的时间尺度上穿过冰幔。给出了冰幔翻转时间和行星半径与总质量和水质量分数的关系。最后，我们讨论了这些内部过程对大气可观测值的影响。
The ever-expanding catalog of detected super-Earths calls for theoretical studies of their properties in the case of a substantial water layer. This work considers such water planets with a range of masses and water mass fractions (2-5 M-Earth, 0.02%-50% H2O). First, we model the thermal and dynamical structure of the near-surface for icy and oceanic surfaces, finding separate regimes where the planet is expected to maintain a subsurface liquid ocean and where it is expected to exhibit ice tectonics. Newly discovered exoplanets may be placed into one of these regimes given estimates of surface temperature, heat flux, and gravity. Second, we construct a parameterized convection model for the underlying ice mantle of higher ice phases, finding that materials released from the silicate-iron core should traverse the ice mantle on the timescale of 0.1 to 100 megayears. We present the dependence of the overturn times of the ice mantle and the planetary radius on total mass and water mass fraction. Finally, we discuss the implications of these internal processes on atmospheric observables.