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arXiv 2401.12166astro-ph.EP
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木星内部研究:2、3、4、5和6层模型的比较

Study of Jupiter's Interior: Comparison of 2, 3, 4, 5, and 6 Layer Models

Burkhard Militzer, William B. Hubbard

AI总结:

本文通过构建并比较木星内部的2至6层模型,发现五层稀释核模型最符合朱诺号重力测量数据,并优化了CMS方法以高效生成模型集合。

摘要:

为了匹配朱诺号和伽利略号任务的航天器测量结果,我们构建了木星内部的2、3、4、5和6层模型集合。除两层模型外,其余所有模型都能匹配朱诺号航天器测得的木星重力场。然而,我们发现某些模型类型比其他模型更为合理。例如,在最佳的三层模型中,从分子氢到金属氢的转变需要发生在约500 GPa处,而理论和实验将这一转变定位于约100 GPa。具有单一清晰核幔边界的四层模型会因快速的对流核侵蚀而寿命短暂。出于这一原因,我们更倾向于五层模型,该模型包含一个被稳定分层的核过渡层所包围的稀释核。具有小型致密核的六层模型也是可能的,但此类致密核的质量上限为3个地球质量。所有模型均假设1巴温度下的温度为166.1 K,采用物理状态方程,并使用非微扰的同心麦克劳林球体(CMS)方法构建。我们分析了该方法的收敛性,并描述了为使该技术足够高效从而能够生成模型集合所需的技术步骤。

英文摘要:

With the goal of matching spacecraft measurements from Juno and Galileo missions, we construct ensembles of 2, 3, 4, 5, and 6 layer models for Jupiter's interior. All except our two layer models can match the planet's gravity field as measured by the Juno spacecraft. We find, however, that some model types are more plausible than others. In the best three layer models, for example, the transition from molecular to metallic hydrogen needs to be at ~500 GPa while theory and experiments place this transition at ~100 GPa. Four layer models with a single sharp boundary between core and mantle would be short-lived due to rapid convective core erosion. For this reason, we favor our five layer models that include a dilute core surrounded by a stably stratified core transition layer. Six layer models with a small compact core are also possible but with an upper limit of 3 Earth masses for such a compact core. All models assume a 1 bar temperature of 166.1 K, employ physical equations of state, and are constructed with the nonperturbative Concentric Maclaurin Spheroid (CMS) method. We analyze the convergence of this method and describe technical steps that are needed to make this technique so efficient that ensembles of models can be generated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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