Neutrino-cooled Accretion Model with Magnetic Coupling for X-ray Flares in GRBs

Abstract

The neutrino-cooled accretion disk, which was proposed to work as the central engine of gamma-ray bursts, encounters difficulty in interpreting the X-ray flares after the prompt gamma-ray emission. In this paper, the magnetic coupling between the inner disk and the central black hole is taken into consideration. For mass accretion rates around $0.001 \sim 0.1 M_{\sun} s^{-1}$, our results show that the luminosity of neutrino annihilation can be significantly enhanced due to the coupling effects. As a consequence, after the gamma-ray emission, a remnant disk with mass $M_{disk} \la 0.5 M_{\sun}$ may power most of the observed X-ray flares with the rest frame duration less than 100 seconds. In addition, a comparison between the magnetic coupling process and the Blandford-Znajek mechanism is shown on the extraction of black hole rotational energy.

16 pages, 4 figures, accepted for publication in ApJ

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• Can black-hole neutrino-cooled disks power short gamma-ray bursts?
• Testing black hole neutrino-dominated accretion discs for long-duration gamma-ray bursts
• Self-gravity in neutrino-dominated accretion disks
• Statistical analyses on the energies of X-ray plateaus and flares in gamma-ray bursts
• Central Engine of Late-Time X-ray Flares with Internal Origin
• Black hole hyperaccretion inflow-outflow model. II. Long-duration gamma-ray bursts and supernova ${}^{56}\mathrm{Ni}$ bumps
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• Evolutions of stellar-mass black hole hyperaccretion systems in the center of gamma-ray bursts
• Variability of the giant X-ray bump in GRB 121027A and possible origin
• Vertical convection in neutrino-dominated accretion flows
• A method to constrain mass and spin of GRB black hole within the NDAF model
• GRB X-Ray Flare Properties among Different GRB Subclasses
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• Vertical Advection Effects on Hyper-accretion Disks and Potential Link between Gamma-ray Bursts and Kilonovae
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• Energy accumulation mechanism in pulsar magnetospheric plasma eigen-waves and formation of Giant Radio Pulses
• Comparative Statistical Analysis of Prompt and Afterglow X-Ray Flares in Gamma-Ray Bursts: Insights into Extended Central Engine Activity
• Relativistic global solutions of neutrino-dominated accretion flows with magnetic coupling
• A lower occurrence rate of bright X-ray flares in SN-GRBs than $z<1$ GRBs: evidence of energy partitions?