Electrodynamics of binary neutron star mergers
Electrodynamics of binary neutron star mergers
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双中子星并合的电动力学
DOI：
10.1093/mnras/sty3303
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发表时间：
2018
影响因子：
4.8
通讯作者：
M. Lyutikov
中科院分区：
文献类型：
--
作者：
M. Lyutikov
我们考虑合并中子星的电磁相互作用和前体发射。磁化中子星的轨道运动可能会在合并前几年恢复共同磁层内的对产生，从而引发类似脉冲星的磁层动力学。我们确定了两种基本场景：(i) 只有一颗恒星被磁化（1M-DNS 场景）和 (ii) 两颗恒星都被磁化（2M-DNS 场景）。感应产生的电场可以具有沿着总磁场（间隙）的分量和/或电场可以超过局部磁场的值。检测的关键是发射的轨道调制。如果只有一颗恒星被磁化（1M-DNS 场景），则可能会沿着副星所在位置的磁场方向产生发射；那么，如果磁轴与轨道自旋未对准，则该方向会根据轨道周期进行调制。对于2M-DNS场景，非旋转中子星共同磁层结构复杂，存在间隙，但不存在$E>B$区域；对于磁矩未对准的情况，存在强烈的轨道变化。对于相同的中子星参数，2M-DNS 方案本质上比 1M-DNS 方案具有更高的潜力。整体威力不是很高，$\leq 10^{45} $ erg s$^{-1}$；探测合并中子星的电磁前兆的最佳机会是，如果它们的磁层相互作用导致产生在轨道周期调制的类似脉冲星的相干无线电发射，合并时的光度高达 $\sim 1$ Jankys。
We consider electromagnetic interaction and precursor emission of merging neutron stars. Orbital motion of the magnetized neutron stars may revive pair production within the common magnetosphere years before the merger, igniting pulsar-like magnetospheric dynamics. We identify two basic scenarios: (i) only one star is magnetized (1M-DNS scenario) and (ii) both stars are magnetized (2M-DNS scenario). Inductively created electric fields can have component along the total magnetic field (gaps) and/or the electric field may exceed the value of the local magnetic field. The key to the detection is orbital modulation of the emission. If only one star is magnetized (1M-DNS scenario) the emission is likely to be produced along the direction of the magnetic field at the location of the secondary; then, if the magnetic axis is misaligned with the orbital spin, this direction is modulated on the orbital period. For the 2M-DNS scenario, the structure of the common magnetosphere of the non-rotating neutron stars is complicated, with gaps, but no $E>B$ regions; there is strong orbital variations for the case of misaligned magnetic moments. For the same parameters of neutron stars the 2M-DNS scenario has intrinsically higher potential than the 1M-DNS one. The overall powers are not very high, $\leq 10^{45} $ erg s$^{-1}$; the best chance to detect electromagnetic precursors to the merging neutron stars is if the interaction of their magnetospheres leads to the production of pulsar-like coherent radio emission modulated at the orbital period, with luminosity of up to $\sim 1$ Jankys at the time the merger.
影响因子：
8.6
作者：
Abbott, B. P.;Abbott, R.;Zweizig, J.
通讯作者：
Zweizig, J.