论文标题
伽玛射线爆发的早期光学余波中的极化，由进攻射流驱动
Polarization in early optical afterglows of gamma-ray bursts driven by precessing jets
论文作者
论文摘要
喷气预算广泛参与从星系到X射线二进制和伽马射线爆发（GRB）的天体物理现象。极化提出了GRB喷气机中磁场的独特探针。 GRB相对论喷气机的进动将改变射流可观察到的发射区域内的几何形状，这可能会影响余辉的极化。在本文中，我们考虑了喷气序列，以研究具有有序和随机磁场几何形状的GRB早期光学余波中的极化演化和相应的光曲线。我们发现，无论磁场结构如何，长寿命发动机中的射流进液都可以显着降低极化度（PD）。当视线与进动轴对齐时，发现最强的PD衰减。我们的结果表明，喷气疗法可以为在GRB的早期光学余波中测得的低PD提供新的见解。
Jet precessions are widely involved in astrophysical phenomena from galaxies to X-ray binaries and gamma-ray bursts (GRBs). Polarization presents a unique probe of the magnetic fields in GRB jets. The precession of GRBs relativistic jets will change the geometry within the observable emitting region of the jet, which can potentially affect the polarization of the afterglow. In this paper, we take into account jet precession to study the polarization evolution and corresponding light curves in GRB early optical afterglows with ordered and random magnetic field geometries. We find that the jet precession in long-lived engines can significantly reduce the polarization degree (PD) regardless of the magnetic field structure. The strongest PD attenuation is found when the line of sight is aligned with the precession axis. Our results show that jet precession can provide new insight into the low PD measured in the early optical afterglows of GRBs.
