Afterglow Polarization from Off-axis Gamma-Ray Burst Jets

Author:

do E. S. Pedreira A. C. CaligulaORCID,Fraija N.ORCID,Galvan-Gamez A.ORCID,Kamenetskaia B. BetancourtORCID,Veres P.ORCID,Dainotti M. G.ORCID,Dichiara S.ORCID,Becerra R. L.ORCID

Abstract

Abstract As we further our studies on gamma-ray bursts (GRBs), via both theoretical models and observational tools, more and more options begin to open for exploration of its physical properties. As GRBs are transient events primarily dominated by synchrotron radiation, it is expected that the synchrotron photons emitted by GRBs should present some degree of polarization throughout the evolution of the burst. Whereas observing this polarization can still be challenging due to the constraints on observational tools, especially for short GRBs, it is paramount that the groundwork is laid for the day we have abundant data. In this work, we present a polarization model linked with an off-axis spreading top-hat jet synchrotron scenario in a stratified environment with a density profile n(r) ∝ r k . We present this model's expected temporal polarization evolution for a realistic set of afterglow parameters constrained within the values observed in the GRB literature for four degrees of stratification k = 0, 1, 1.5, and 2 and two magnetic field configurations with high extreme anisotropy. We apply this model and predict polarization from a set of GRBs exhibiting off-axis afterglow emission. In particular, for GRB 170817A, we use the available polarimetric upper limits to rule out the possibility of an extremely anisotropic configuration for the magnetic field.

Funder

UNAM ∣ Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Reverse shock emission in an off-axis top-hat jet model for gamma-ray bursts;Monthly Notices of the Royal Astronomical Society;2024-01-18

2. Numerical simulations of polarisation in gamma-ray burst afterglows;Monthly Notices of the Royal Astronomical Society;2023-06-19

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