Modeling the GRB jet properties with 3D general relativistic simulations of magnetically arrested accretion flows

Abstract

We investigate the dependence of the GRB jet structure and its evolution on the properties of the accreting torus in the central engine. Our models numerically evolve the accretion disk around a Kerr black hole using 3D general relativistic magnetohydrodynamic simulations. We use two different analytical hydrodynamical models of the accretion disk, based on the Fishbone-Moncrief and Chakrabarti solutions, as our initial states for the structure of the collapsar disk and the remnant after a binary neutron star merger, respectively. We impose poloidal magnetic fields of two different geometries upon the initial stable solutions. We study the formation and evolution of the magnetically arrested disk state and its effect on the properties of the emitted jet. The jets produced in our models are structured and have a relatively hollow core and reach higher Lorentz factors at an angle $\gtrsim 9{}^{\circ }$ from the axis. The jet in our short GRB model has an opening angle of up to $\sim 25^{\circ }$ while our long GRB engine produces a narrower jet, of up to $\sim 11^{\circ }$. We also study the time variability of the jets and provide an estimate of the minimum variability timescale in our models. The application of our models to the GRB jets in the binary neutron star post-merger system and to the ultra-relativistic jets launched from collapsing stars are briefly discussed.

The Astrophysical Journal, in press

References in corpus (14)

• Array Programming with NumPy
• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Kilonova Light Curves from the Disk Wind Outflows of Compact Object Mergers
• High resolution numerical-relativity simulations for the merger of binary magnetized neutron stars
• Magnetically Arrested Disks and Origin of Poynting Jets: Numerical Study
• Jets in Magnetically Arrested Hot Accretion Flows: Geometry, Power and Black Hole Spindown
• Neutron star-black hole mergers with a nuclear equation of state and neutrino cooling: Dependence in the binary parameters
• First Multimessenger Observations of a Neutron Star Merger
• Off-axis short GRBs from structured jets as counterparts to GW events
• A Resolution Study of Magnetically Arrested Disks
• Gamma-Ray Bursts: Temporal Scales and the Bulk Lorentz Factor
• Looking for the underlying cause of black hole X-ray variability in GRMHD simulations
• Constraints on Gamma-ray Burst Inner Engines in a Blandford-Znajek Framework
• Variability of magnetically-dominated jets from accreting black holes

Cited by in corpus (5)

• Maximal Jet Energy of Gamma-Ray Bursts through the Blandford-Znajek Mechanism
• Viscous torque in turbulent magnetized AGN accretion disks and its effects on EMRI's gravitational waves
• Exploring Jet Structure and Dynamics in Short Gamma Ray Bursts: A Case Study on GRB 090510
• Three-dimensional GRMHD simulations of jet formation and propagation in self-gravitating collapsing stars
• Exploring the Role of Vector Potential and Plasma-$\beta$ in Jet Formation from Magnetized Accretion Flows