Revisiting vertical structure of neutrino-dominated accretion disks: Bernoulli parameter, neutrino trapping and other distributions

TL;DR

This paper investigates the vertical structure of neutrino-dominated accretion disks, revealing their thickness, outflow potential, and the impact of neutrino trapping on luminosity, with implications for gamma-ray burst flares.

Contribution

It introduces a new boundary condition for NDAF vertical structure analysis, highlighting multilayer features and outflow possibilities.

Findings

NDAFs are significantly thick disks.

Neutrino trapping affects radiation luminosity.

Outflows may occur in outer disk regions.

Abstract

We revisit the vertical structure of neutrino dominated accretion flows (NDAFs) in spherical coordinates with a new boundary condition based on the mechanical equilibrium. The solutions show that NDAF is significantly thick. The Bernoulli parameter and neutrino trapping are determined by the mass accretion rate and the viscosity parameter. According to the distribution of the Bernoulli parameter, the possible outflow may appear in the outer region of the disk. The neutrino trapping can essentially affect the neutrino radiation luminosity. The vertical structure of NDAF is like a "sandwich", and the multilayer accretion may account for the flares in gamma-ray bursts.