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首页> 外文期刊>The Astrophysical Journal. Letters >The effect of lower mantle metallization on magnetic field generation in rocky exoplanets
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The effect of lower mantle metallization on magnetic field generation in rocky exoplanets

机译：较低地幔金属化对岩石外岩磁场产生的影响

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摘要

Recent theoretical and experimental evidence indicates that many of the materials that are thought to exist in the mantles of terrestrial exoplanets will metallize and become good conductors of electricity at mantle pressures. This allows for strong electromagnetic coupling of the core and the mantle in these planets. We use a numerical dynamo model to study the effect of a metallized lower mantle on the dynamos of terrestrial exoplanets using several inner core sizes and mantle conductivities. We find that the addition of an electrically conducting mantle results in stronger core-mantle boundary fields because of the increase in magnetic field stretching. We also find that a metallized mantle destabilizes the dynamo resulting in less dipolar, less axisymmetric poloidal magnetic fields at the core-mantle boundary. The conducting mantle efficiently screens these fields to produce weaker surface fields. We conclude that a conducting mantle will make the detection of extrasolar terrestrial magnetic fields more difficult while making the magnetic fields in the dynamo region stronger.
机译：最近的理论和实验证据表明，许多被认为存在于陆地外产的地幔中的材料将在地幔压力下金属化并成为电力的良好电力导体。这允许在这些行星中的芯和地幔的强电磁耦合。我们使用数值发电机模型来研究使用几种内核芯尺寸和地幔导电性的陆地外肌肌动发电机的效果。我们发现，由于磁场拉伸的增加，添加导电地幔导致较强的核心地幔边界场。我们还发现金属化地幔稳定发电机，导致核心地幔边界处的较少的双极性，较小的轴对称磁场较少。导电地幔有效地筛选这些田地以产生较弱的表面场。我们得出结论，导电地幔将使辐射陆地磁场的检测更加困难，同时使发电机区域中的磁场更强。

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