Instabilities in the time-dependent neutrino disc in Gamma-Ray Bursts

Abstract

We investigate the properties and evolution of accretion tori formed after the coalescence of two compact objects. At these extreme densities and temperatures, the accreting torus is cooled mainly by neutrino emission produced primarily by electron and positron capture on nucleons (beta reactions). We solve for the disc structure and its time evolution by introducing a detailed treatment of the equation of state which includes photodisintegration of helium, the condition of beta-equilibrium, and neutrino opacities. We self-consistently calculate the chemical equilibrium in the gas consisting of helium, free protons, neutrons and electron-positron pairs and compute the chemical potentials of the species, as well as the electron fraction throughout the disc. We find that, for sufficiently large accretion rates (> 10 solar masses per second), the inner regions of the disk become opaque and develop a viscous and thermal instability. The identification of this instability might be relevant for GRB observations.

23 pages, 18 figures; accepted for publication in ApJ

References in corpus (4)

• Neutrino-Cooled Accretion Disks around Spinning Black Hole
• Neutrino-Dominated Accretion Models for Gamma-Ray Bursts: Effects of General Relativity and Neutrino Opacity
• Magnetohydrodynamic Simulations of A Rotating Massive Star Collapsing to A Black Hole
• Electron Positron Capture Rates and the Steady State Equilibrium Condition for Electron-Positron Plasma with Nucleons

Cited by in corpus (30)

• Mass Fall-back and Accretion in the Central Engine of Gamma-Ray Bursts
• Hyper-accreting black hole as GRB central engine. I: Baryon loading in GRB jets
• Giant X-ray Bump in GRB 121027A: Evidence for Fall-back Disk Accretion
• Magnetically Torqued Neutrino-Dominated Accretion Flows for Gamma-ray Bursts
• Hyperaccreting Black Hole as Gamma-Ray Burst Central Engine. II. Temporal evolution of central engine parameters during Prompt and Afterglow Phases
• Hyperaccreting Neutron-Star Disks and Neutrino Annihilation
• GRB Precursors in the Fallback Collapsar Scenario
• Signature of a New-Born Black Hole from the Collapse of a Supra-massive Millisecond Magnetar
• Constraints on the Mass Accretion Rate of Neutrino-Cooled Disks in Gamma-Ray Bursts
• Hyperaccretion Disks around Neutron Stars
• Self-gravity in neutrino-dominated accretion disks
• Flares in Gamma Ray Bursts: Disc Fragmentation and Evolution
• Microphysics in the gamma ray burst central engine
• On the duration of long GRBs: effects of black hole spin
• Comparison of gravitational waves from central engines of gamma-ray bursts: neutrino-dominated accretion flows, Blandford-Znajek mechanisms, and millisecond magnetars
• Numerical and analytical solutions of Neutrino-Dominated Accretion Flows with a Non-Zero Torque Boundary Condition and its applications in Gamma-ray Bursts
• Vertical convection in neutrino-dominated accretion flows
• Variabilities of Gamma-ray Bursts from Black Hole Hyper-accretion Disks
• Black hole hyperaccretion in collapsars. II. Gravitational waves
• Anisotropic neutrinos and gravitational waves from black hole neutrino-dominated accretion flows in fallback core-collapse supernovae
• Black hole hyperaccretion in collapsars. III. GRB timescale
• The Origin of the Photospheric Emission of GRB 220426A
• Self-gravitating collapsing star and black hole spin-up in long gamma ray bursts
• Studying Postmerger Outflows from Magnetized Neutrino-cooled Accretion Disks
• GRB 210121A: Observation of photospheric emissions from different regimes and the evolution of the outflow
• GRB minimum variability timescales with Fermi/GBM
• Wakefield Acceleration in a Jet from a Neutrino Driven Accretion Flow around a Black Hole
• Relativistic global solutions of neutrino-dominated accretion flows with magnetic coupling
• EP241113a: dissipative photospheric emission from a dirty fireball
• GRB variabilities and following gravitational waves induced by gravitational instability in NDAFs