PHOTOSPHERIC EMISSION FROM COLLAPSAR JETS IN 3D RELATIVISTIC HYDRODYNAMICS

被引：48
作者：
Ito, Hirotaka [1 ]
Matsumoto, Jin [1 ]
Nagataki, Shigehiro [1 ]
Warren, Donald C. [1 ]
Barkov, Maxim V. [1 ]
机构：
[1] RIKEN, Astrophys Big Bang Lab, Wako, Saitama 3510198, Japan
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 814卷 / 02期
基金：
日本学术振兴会;
关键词：
gamma-ray burst: general; radiation mechanisms: thermal; radiative transfer; scattering; GAMMA-RAY BURSTS; POLARIZATION PROPERTIES; SPECTRAL CATALOG; STRATIFIED JETS; OUTFLOWS; FERMI; PEAK; GRB; VARIABILITY; EFFICIENCY;
D O I：
10.1088/2041-8205/814/2/L29
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We explore the photospheric emission from a relativistic jet breaking out from a massive stellar envelope based on relativistic hydrodynamical simulations and post-process radiation transfer calculations in three dimensions. To investigate the impact of three-dimensional (3D) dynamics on the emission, two models of injection conditions are considered for the jet at the center of the progenitor star: one with periodic precession and another without precession. We show that structures developed within the jet due to the interaction with the stellar envelope, as well as due to the precession, have a significant imprint on the resulting emission. Particularly, we find that the signature of precession activity by the central engine is not smeared out and can be directly observed in the light curve as a periodic signal. We also show that non-thermal features, which can account for observations of gamma-ray bursts, are produced in the resulting spectra even though only thermal photons are injected initially and the effect of non-thermal particles is not considered.
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页数：6
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