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arXiv 2003.06662astro-ph.HEastro-ph.SR
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质子中子星中通过对流发电机的磁星形成

Magnetar formation through a convective dynamo in protoneutron stars

Raphaël Raynaud, Jérôme Guilet, Hans-Thomas Janka, Thomas Gastine

摘要:

磁星释放的自旋向下的能量是一个很有希望的方案,为几类极端爆炸瞬变提供动力。然而,它缺乏坚实的基础,因为磁星的形成仍然是一个理论上的挑战。使用的第一个三维模拟的对流发电机的基础上的质子中子星内部模型,我们证明,所需的偶极磁场可以始终产生足够快的旋转速率。发电机的不稳定性饱和在磁旋制度的磁能超过动能的一个因素高达10。我们的研究结果与银河系磁场强度的观测约束相一致,为伽马射线暴和超亮超新星中心引擎的毫秒级原磁星模型提供了强有力的理论支持。

英文摘要:

The release of spin-down energy by a magnetar is a promising scenario to power several classes of extreme explosive transients. However, it lacks a firm basis because magnetar formation still represents a theoretical challenge. Using the first three-dimensional simulations of a convective dynamo based on a protoneutron star interior model, we demonstrate that the required dipolar magnetic field can be consistently generated for sufficiently fast rotation rates. The dynamo instability saturates in the magnetostrophic regime with the magnetic energy exceeding the kinetic energy by a factor of up to 10. Our results are compatible with the observational constraints on galactic magnetar field strength and provide strong theoretical support for millisecond protomagnetar models of gamma-ray burst and superluminous supernova central engines.

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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