Journal Article

Long-duration gamma-ray bursts: hydrodynamic instabilities in collapsar discs

P. A. Taylor, J. C. Miller and Ph. Podsiadlowski

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 410, issue 4, pages 2385-2413
Published in print February 2011 | ISSN: 0035-8711
Published online January 2011 | e-ISSN: 1365-2966 | DOI:
Long-duration gamma-ray bursts: hydrodynamic instabilities in collapsar discs

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We present 3D numerical simulations of the early evolution of long-duration gamma-ray bursts in the collapsar scenario. Starting from the core collapse of a realistic progenitor model, we follow the formation and evolution of a central black hole and centrifugally balanced disc. The dense, hot accretion disc produces freely escaping neutrinos and is hydrodynamically unstable to clumping and to forming non-axisymmetric (m = 1, 2) modes. We show that these spiral structures, which form on dynamical time-scales, can efficiently transfer angular momentum outwards and can drive the high required accretion rates (≥0.1–1 M s−1) for producing a jet. We utilize the smoothed particle hydrodynamics code, gadget-2, modified to implement relevant microphysics, such as cooling by neutrinos, a plausible treatment approximating the central object and relativistic effects. Finally, we discuss implications of this scenario as a source of energy to produce relativistically beamed γ-ray jets.

Keywords: black hole physics; hydrodynamics; instabilities; neutrinos

Journal Article.  17910 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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