arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1210.3452astro-ph.HE
收藏

中微子驱动风的动力学:包括强磁场中精确的弱相互作用速率

Dynamics of neutrino-driven winds: inclusion of accurate weak interaction rates in strong magnetic fields

Men-Quan Liu, Zhong-Xiang Wang

摘要:

通过求解牛顿定态风方程,考虑年轻中子星的精确弱相互作用率和磁场,研究了原中子星中微子驱动风的动力学和核合成.对于典型的1.4 M $_{\odot}$ PNS模型,我们发现核合成产物与中微子和反中微子的光度密切相关。光度越低,弱相互作用和磁场对NDW的影响越大。在典型的高反中微子光度为$8\times 10^{51}$ erg s $^{-1}$时,中微子和反中微子在NDW中占主导地位,MF几乎不改变风的性质。而在NDW后期的低反中微子光度($10^{51}$ erg s $^{-1}$)下,强MF中的产物和核合成质量发生了显著变化,但其重要性不如反中微子光度高的早期阶段。因此,对于大多数模型考虑的NDW从PNS,根据我们的计算的影响,MF和净弱相互作用的核合成是不显着的。

英文摘要:

Solving Newtonian steady-state wind equations with accurate weak interaction rates and magnetic fields (MFs) of young neutron stars considered, we study the dynamics and nucleosynthesis of neutrino-driven winds (NDWs) from proto neutron stars (PNSs). For a typical 1.4 M$_{\odot}$ PNS model, we find the nucleosynthesis products are closely related to the luminosity of neutrinos and anti-neutrinos. The lower the luminosity is, the larger effect to the NDWs caused by weak interactions and MFs is. At a high anti-neutrino luminosity of typically $8\times 10^{51}$ erg s$^{-1}$, neutrinos and anti-neutrinos dominate the processes in a NDW and the MFs hardly change the wind's properties. While at a low anti-neutrino luminosity of $10^{51}$ erg s$^{-1}$ at the late stage of a NDW, the mass of product and nucleosynthesis are changed significantly in the strong MFs, they are less important than those in the early stage when the anti-neutrino luminosity is high. Therefore for the most models considered for the NDWs from PNSs, based on our calculations the influences of MFs and the net weak interactions on the nucleosynthesis is not significant.

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。

↑