JUPITER MODELS WITH IMPROVED AB INITIO HYDROGEN EQUATION OF STATE (H-REOS.2)
JUPITER MODELS WITH IMPROVED AB INITIO HYDROGEN EQUATION OF STATE (H-REOS.2)
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DOI：
10.1088/0004-637x/750/1/52
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发表时间：
2012-05-01
影响因子：
4.9
通讯作者：
Redmer, R.
中科院分区：
文献类型：
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作者：
Nettelmann, N.;Becker, A.;Redmer, R.
木星中重元素的数量和分布为木星的形成和演化过程提供了线索。然而，核质量和金属丰度的预测依赖于所使用的状态方程（eos）和模型假设。我们提出了一种改进的从头算氢EOS， H-REOS。2、用标准的三层方法计算木星的内部结构和热演化。这比我们之前的H-REOS木星模型有了进步。Nettelmann等人的研究发现，新模型也与观测到的木星大气中重元素丰度大于或接近太阳的2倍一致。该模型岩心质量M-c = 0-8 M-circle plus，重元素总质量M-Z = 28-32 M-circle plus，深层内层边界>= 4 Mbar，假设均质演化时冷却时间为4.4-5.0 Gyr。我们还以Militzer等人的方式计算了两层模型，并发现了16-21 M-circle plus的相当大的核心，其中氦与11 M-circle plus相似，但包膜金属丰度明显更高，为太阳的4.5倍。根据我们首选的三层模型，特征频率（nu(0)类似于156 mu Hz）和归一化惯性矩（lambda类似于0.276）对核心质量都不敏感，但精确的测量可以很好地帮助排除某些类型的模型。
The amount and distribution of heavy elements in Jupiter gives indications on the process of its formation and evolution. Core mass and metallicity predictions, however, depend on the equations of state (EOSs) used and on model assumptions. We present an improved ab initio hydrogen EOS, H-REOS. 2, and compute the internal structure and thermal evolution of Jupiter within the standard three-layer approach. The advance over our previous Jupiter models with H-REOS. 1 by Nettelmann et al. is that the new models are also consistent with the observed greater than or similar to 2 times solar heavy element abundances in Jupiter's atmosphere. Such models have a rock core mass M-c = 0-8 M-circle plus, total mass of heavy elements M-Z = 28-32 M-circle plus, a deep internal layer boundary at >= 4 Mbar, and a cooling time of 4.4-5.0 Gyr when assuming homogeneous evolution. We also calculate two-layer models in the manner of Militzer et al. and find a comparable large core of 16-21 M-circle plus, out of which similar to 11 M-circle plus is helium, but a significantly higher envelope metallicity of 4.5 times solar. According to our preferred three-layer models, neither the characteristic frequency (nu(0) similar to 156 mu Hz) nor the normalized moment of inertia (lambda similar to 0.276) is sensitive to the core mass but accurate measurements could well help to rule out some classes of models.