Radiative striped wind model for gamma-ray bursts

D. Bégué, A. Pe'er, Y. Lyubarsky

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

In this paper, we revisit the striped wind model in which the wind is accelerated by magnetic reconnection. In our treatment, radiation is included as an independent component, and two scenarios are considered. In the first one, radiation cannot stream efficiently through the reconnection layer, while the second scenario assumes that radiation is homogeneous in the striped wind. We show how these two assumptions affect the dynamics. In particular, we find that the asymptotic radial evolution of the Lorentz factor is not strongly modified whether radiation can stream through the reconnection layer or not. On the other hand, we show that the width, density and temperature of the reconnection layer are strongly dependent on these assumptions. We then apply the model to the gamma-ray burst context and find that photons cannot diffuse efficiently through the reconnection layer below radius rDΔ ∼ 1010.5 cm, which is about an order of magnitude below the photospheric radius. Above rDΔ, the dynamics asymptotes to the solution of the scenario in which radiation can stream through the reconnection layer. As a result, the density of the current sheet increases sharply, providing efficient photon production by the Bremsstrahlung process that could have profound influence on the emerging spectrum. This effect might provide a solution to the soft photon problem in gamma-ray bursts.

Original languageEnglish
Pages (from-to)2594-2611
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume467
Issue number3
DOIs
StatePublished - 1 Jun 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Keywords

  • Diffusion
  • Gamma-ray burst: general
  • Magnetic reconnection
  • Radiative transfer

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