Zhang 2008 中子星的超吸积

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Title:		Hyperaccreting Neutron-Star Disks and Neutrino Annihilation
Authors:		Zhang, Dong; Dai, Z. G.
Publication:		eprint arXiv:0901.0431
Publication Date:		01/2009
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		37 pages, 10 figures, submitted to ApJ
Bibliographic Code:		2009arXiv0901.0431Z

Abstract

Newborn neutron stars surrounded by hyperaccreting and neutrino-cooled disks may exist in some gamma-ray bursts (GRBs) and/or supernovae (SNe). In this paper we further study the structure of such a neutron-star disk based on the two-region (i.e., inner & outer) disk scenario following our previous work, and calculate the neutrino annihilation luminosity from the disk in various cases. We investigate the effects of the viscosity parameter $\alpha$, energy parameter $\epsilon$ (measuring the neutrino cooling efficiency of the inner disk) and outflow strength on the structure of the entire disk as well as the effect of emission from the neutron star surface boundary emission on the total neutrino annihilation rate. The inner disk satisfies the entropy-conservation self-similar structure for the viscosity parameter $\epsilon\simeq 1$ and the advection-dominated structure for $\epsilon<1$.> Bibtex entry for this abstract Preferred format for this abstract (see Preferences)