第一性原理模拟预测木星的大质量核心
A Massive Core in Jupiter Predicted From First-Principles Simulations
摘要：
用第一性原理计算机模拟研究了木星内部条件下的氢氦混合物。由此产生的状态方程（EOS）意味着木星拥有一个由14-18个地球质量的重元素组成的中央核心，这一结果支持核心吸积作为富氢巨行星形成的标准模型。我们的名义模型在富含氢氦的地幔中有大约2个地球质量的行星冰，这一结果在建模误差范围内，与1995年伽利略进入探测器任务测量的丰度一致（当外推到地幔时，相当于大约5个地球质量的行星冰），这表明探测器发现的成分可能代表整个行星。内部模型来自这个第一原理EOS不给一个匹配木星的重力矩J 4，除非一个调用内部的差异旋转，这意味着木星内部动力学有一个可观察到的影响测量的重力场。
英文摘要：
Hydrogen-helium mixtures at conditions of Jupiter's interior are studied with first-principles computer simulations. The resulting equation of state (EOS) implies that Jupiter possesses a central core of 14-18 Earth masses of heavier elements, a result that supports core accretion as standard model for the formation of hydrogen-rich giant planets. Our nominal model has about 2 Earth masses of planetary ices in the H-He-rich mantle, a result that is, within modeling errors, consistent with abundances measured by the 1995 Galileo Entry Probe mission (equivalent to about 5 Earth masses of planetary ices when extrapolated to the mantle), suggesting that the composition found by the probe may be representative of the entire planet. Interior models derived from this first-principles EOS do not give a match to Jupiter's gravity moment J4 unless one invokes interior differential rotation, implying that jovian interior dynamics has an observable effect on the measured gravity field.
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