Binary Merger Progenitors for Gamma-Ray Bursts and Hypernovae

Abstract

The collapsar model, the now leading model for the engine behind gamma-ray bursts and hypernovae, requires that a star collapses to form a black hole surrounded by an accretion disk of high-angular momentum material. The current best theoretical stellar models, however, do not retain enough angular momentum in the core of the star to make a centrifugally supported disk. In this paper, we present the first calculations of the helium-star/helium-star merger progenitors for the collapsar model. These progenitors invoke the merger of two helium cores during the common envelope inspiral phase of a binary system. We find that, in some cases, the merger can produce cores that are rotating 3-10 times faster than single stars. He-star/He-star gamma-ray burst progenitors have a very different redshift distribution than their single-star gamma-ray burst progenitors and we discuss how gamma-ray burst observations can constrain these progenitors.

29 pages including 12 figures, submitted to ApJ

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