Journal Article

Nucleosynthesis of <sup>56</sup>Ni in wind-driven supernova explosions and constraints on the central engine of gamma-ray bursts

Keiichi Maeda and Nozomu Tominaga

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 394, issue 3, pages 1317-1324
Published in print April 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI:
Nucleosynthesis of 56Ni in wind-driven supernova explosions and constraints on the central engine of gamma-ray bursts

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Theoretically expected natures of a supernova (SN) driven by a wind/jet are discussed. Approximate analytical formulations are derived to clarify basic physical processes involved in the wind/jet-driven explosions, and it is shown that the explosion properties are characterized by the energy injection rate and the mass injection rate . To explain observations of Supernova 1998bw associated with gamma-ray burst (GRB) 980425, the following conditions are required: and (if the wind Lorentz factor Γw∼ 1) or (if Γw≫ 1). In Supernova 1998bw, 56Ni (∼0.4 M) is probably produced in the shocked stellar mantle, not in the wind. The expected natures of SNe, e.g. ejected 56Ni mass and ejecta mass, vary depending on and . The sequence of the SN properties from high and to low and is as follows: Supernova 1998bw-like – intermediate case – low mass ejecta (≲1 M) where 56Ni is from the wind – whole collapse. This diversity may explain the diversity of SNe associated with GRBs. Our result can be used to constrain natures of the wind/jet, which are linked to the central engine of GRBs, by studying properties of the associated SNe.

Keywords: nuclear reactions, nucleosynthesis, abundances; supernovae: general; supernovae: individual: SN 1998bw; gamma-ray: bursts

Journal Article.  6785 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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