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Constraints on Type Ib/c and GRB Progenitors

C. L. Fryer, P. A. Mazzali, J. Prochaska, E. Cappellaro, A. Panaitescu, E. Berger, M. van Putten, E. P. J. van den Heuvel, P. Young, A. Hungerford, G. Rockefeller, S. -C. Yoon, P. Podsiadlowski, K. Nomoto, R. Chevalier, B. Schmidt, S. Kulkarni

astro-pharXiv:astro-ph/0702338

Abstract

Although there is strong support for the collapsar engine as the power source of long-duration gamma-ray bursts (GRBs), we still do not definitively know the progenitor of these explosions. Here we review the current set of progenitor scenarios for long-duration GRBs and the observational constraints on these scenarios. Examining these, we find that single-star models cannot be the only progenitor for long-duration GRBs. Several binary progenitors can match the solid observational constraints and also have the potential to match the trends we are currently seeing in the observations. Type Ib/c supernovae are also likely to be produced primarily in binaries; we discuss the relationship between the progenitors of these explosions and those of the long-duration GRBs.

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