论文标题
中子星白矮人合并和重复快速无线电爆发的残余
The remnant of neutron star-white dwarf merger and the repeating fast radio bursts
论文作者
论文摘要
宇宙学距离的快速无线电爆发（FRB）仍然保持隐藏的物理起源。以前，Liu（2018）提出了一种情况，即中子恒星（NS）和白矮人（WD）之间的碰撞可能是非重复的FRB的祖细胞之一，并注意到如果在此类NS-WD合并后形成磁极，也可以解释重复的FRB。在本文中，我们更详细地研究了这种磁性形成渠道。我们建议，在冷却和角动量重新分布后，NS-WD合并后可能会崩溃到黑洞或新的NS，甚至可能保留为混合WDN，具体取决于NS和WD的总质量。特别是，如果WD的核心倒入NS，而新形成的NS可以是磁性，而WD的大量退化电子被压缩到新NS的外层。可以由电子和正电荷形成强磁场，其正电荷具有不同的角速度，由新生儿磁体的差异旋转引起。这样的磁铁可以通过地壳运动或星震带来的磁重复连接来为重复的FRB供电。
Fast radio bursts (FRBs) at cosmological distances still hold concealed physical origins. Previously Liu (2018) proposes a scenario that the collision between a neutron star (NS) and a white dwarf (WD) can be one of the progenitors of non-repeating FRBs and notices that the repeating FRBs can also be explained if a magnetar formed after such NS-WD merger. In this paper, we investigate this channel of magnetar formation in more detail. We propose that the NS-WD post-merger, after cooling and angular momentum redistribution, may collapse to either a black hole or a new NS or even remains as a hybrid WDNS, depending on the total mass of the NS and WD. In particular, the newly formed NS can be a magnetar if the core of the WD collapsed into the NS while large quantities of degenerate electrons of the WD compressed to the outer layers of the new NS. A strong magnetic field can be formed by the electrons and positive charges with different angular velocities induced by the differential rotation of the newborn magnetar. Such a magnetar can power the repeating FRBs by the magnetic reconnections due to the crustal movements or starquakes.
