Accretion of the magnetized neutrino-cooled torus

TL;DR

This paper investigates the evolution of a magnetized, neutrino-cooled accretion disk around a black hole, focusing on the roles of neutrino cooling, magnetic fields, and instabilities in jet formation and disk dynamics.

Contribution

It presents the first detailed GRMHD simulation of a neutrino-cooled accretion disk with realistic physics, highlighting the effects of neutrino cooling and magnetic fields on disk evolution.

Findings

Neutrino cooling significantly influences disk thermal balance.

Magnetic fields drive turbulence and jet formation.

Disk composition evolves dynamically due to cooling and magnetic effects.

Abstract

Neutrino-cooled accretion flow around a black hole, produced by a compact binary merger, is a promising scenario for jet formation and magnetic-driven winds to explain short duration gamma ray bursts (GRBs) central engine and kilonovae based on GW170817 gravitational wave observation. Magnetorotational instability (MRI) turbulence and Blandford-Znajek (BZ) mechanism are expected to play key roles in the thermal equilibrium of the disk (balancing neutrino cooling) and in driving accretion and creating jets. Using the open-source GRMHD HARM-COOL code, we study the magnetically-driven evolution of an accretion disk with realistic equation of state in the fixed curved space-time background. We identify the effects of the neutrino cooling and the magnetic field, paying particular attention to the dynamical, thermal and composition evolution of the disk and outflows.