Kong 2009 星风泡解释余辉的再变亮

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Title:		Variation of microphysics in wind bubbles: an alternative mechanism for explaining the rebrightenings in Gamma-ray burst afterglows
Authors:		Kong, S. W.; Wong, A. Y. L.; Huang, Y. F.; Cheng, K. S.
Affiliation:		AA(Department of Astronomy, Nanjing University, Nanjing 210093, China; Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China), AB(Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China), AC(Department of Astronomy, Nanjing University, Nanjing 210093, China), AD(Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China)
Publication:		Monthly Notices of the Royal Astronomical Society, Volume 402, Issue 1, pp. 409-416. (MNRAS Homepage)
Publication Date:		02/2010
Origin:		WILEY
MNRAS Keywords:		stars: mass loss, ISM: jets and outflows, gamma rays: bursts
DOI:		10.1111/j.1365-2966.2009.15886.x
Bibliographic Code:		2010MNRAS.402..409K

Abstract

Conventionally, long Gamma-ray bursts (GRBs) are thought to be caused by the core collapses of massive stars. During the lifetime of a massive star, a stellar wind bubble environment should be produced. Furthermore, the microphysics shock parameters may vary along with the evolution of the fireball. Here, we investigate the variation of the microphysics shock parameters under the condition of wind bubble environment, and allow the microphysics shock parameters to be discontinuous at shocks in the ambient medium. It is found that our model can acceptably reproduce the rebrightenings observed in GRB afterglows, at least in some cases. The effects of various model parameters on rebrightenings are investigated. The rebrightenings observed in both the R-band and X-ray afterglow light curves of GRB 060206, GRB 070311 and GRB 071010A are reproduced in this model.

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