Kicks and induced spins of neutron stars at birth
Kicks and induced spins of neutron stars at birth
复制标题
中子星诞生时的踢动和诱导自旋
DOI：
10.1093/mnras/stac2573
复制
发表时间：
2022
影响因子：
4.8
通讯作者：
Burrows, Adam
中科院分区：
文献类型：
--
作者：
Coleman, Matthew S. B.;Burrows, Adam
使用非旋转超新星祖先的模拟，我们探讨了踢赋予和在核心坍缩中诞生的紧凑对象中诱导的自旋。我们发现，由于中微子排放的反冲可能是影响核心反冲的一个因素，相当于，有时大于相应的踢由于物质反冲。这一结果需要对脉冲星自行起源的一般模型进行修正。此外，我们还发现中微子净动量的符号可以与相应的物质反冲的符号相反。因此，有时脉冲星反冲和喷出物可以在同一方向。此外，我们的结果表明，中微子辐射中的偶极子的持续时间可以短于中子星结合能辐射的持续时间。这使得更大的偶极不对称性出现，但时间更短，导致观察到的脉冲星范围内的踢。此外，我们发现，由非球面吸积物质所引起的自旋可以留下具有与射电星系类似的自旋周期的坍缩残留物，并且在所引起的自旋方向与净反冲方向之间似乎存在轻微的负相关关系。这可以解释观测到的射电望远镜之间的这种相关性。最后，我们发现黑洞的反冲仅仅是由于中微子的反冲，导致大部分时间的诞生反冲≤100 km s− 1。
Using simulations of non-rotating supernova progenitors, we explore the kicks imparted to and the spins induced in the compact objects birthed in core collapse. We find that the recoil due to neutrino emissions can be a factor affecting core recoil, comparable to and at times larger than the corresponding kick due to matter recoil. This result would necessitate a revision of the general model of the origin of pulsar proper motions. In addition, we find that the sign of the net neutrino momentum can be opposite to the sign of the corresponding matter recoil. As a result, at times the pulsar recoil and ejecta can be in the same direction. Moreover, our results suggest that the duration of the dipole in the neutrino emissions can be shorter than the duration of the radiation of the neutron-star binding energy. This allows a larger dipole asymmetry to arise, but for a shorter time, resulting in kicks in the observed pulsar range. Furthermore, we find that the spin induced by the aspherical accretion of matter can leave the residues of collapse with spin periods comparable to those inferred for radio pulsars and that there seems to be a slight anticorrelation between the direction of the induced spin and the net kick direction. This could explain such a correlation among observed radio pulsars. Finally, we find that the kicks imparted to black holes are due to the neutrino recoil alone, resulting in birth kicks ≤100 km s−1most of the time.