Three-dimensional numerical simulations of structured GRB jets

Understand

After the detection of GRB 170817A, the first unambiguous off-axis gamma-ray burst (GRB), several studies tried to understand the structure of GRB jets.

• The initial jet structure (directly produced by the central engine) can be partially preserved, or can be completely modified by the interaction with the environment.
• In this study, we perform three-dimensional, special relativistic hydrodynamics simulations of long GRB jets evolving through a massive progenitor star.
• Different jet scenarios were considered: Top-hat, Gaussian jets dominated by pressure or by kinetic energy, as well as a model of a supernova (SN) plus a jet both propagating through the progenitor.