Nucleosynthesis of 56Ni in wind-driven Supernova Explosions and Constraints on the Central Engine of Gamma-Ray Bursts - Astrophysics > High Energy Astrophysical PhenomenaReport as inadecuate




Nucleosynthesis of 56Ni in wind-driven Supernova Explosions and Constraints on the Central Engine of Gamma-Ray Bursts - Astrophysics > High Energy Astrophysical Phenomena - Download this document for free, or read online. Document in PDF available to download.

Abstract: Theoretically expected natures of a supernova driven by a wind-jet arediscussed. Approximate analytical formulations are derived to clarify basicphysical processes involved in the wind-jet-driven explosions, and it is shownthat the explosion properties are characterized by the energy injection rateEdot iso and the mass injection rate Mdot iso. To explain observations ofSN 1998bw associated with Gamma-Ray Burst GRB 980425, the followingconditions are required: Edot iso Mdot iso > ~ 10^{51} erg M sun s^{-2} andEdot iso > ~ 2 x 10^{52} erg s^{-1} if the wind Lorentz factor Gamma w ~ 1 orEdot iso > ~ 7 x 10^{52} erg s^{-1} if Gamma w >> 1. In SN 1998bw, 56Ni ~0.4M sun is probably produced in the shocked stellar mantle, not in the wind.The expected natures of SNe, e.g., ejected 56Ni masses and ejecta masses, varydepending on Edot iso and Mdot iso. The sequence of the SN properties from highEdot iso and Mdot iso to low Edot iso and Mdot iso is the following: SN1998bw-like - intermediate case - low mass ejecta < ~ 1M sun$ where 56Ni isfrom the wind - whole collapse. This diversity may explain the diversity ofsupernovae associated with GRBs. Our result can be used to constrain natures ofthe wind-jet, which is linked to the central engine of GRBs, by studyingproperties of the associated supernovae.



Author: Keiichi Maeda, Nozomu Tominaga

Source: https://arxiv.org/







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