科研之友
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摘要
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 ((E) over dot(iso)) and the mass injection rate ((M) over dot(iso)). To explain observations of Supernova 1998bw associated with gamma-ray burst (GRB) 980425, the following conditions are required: (E) over dot(iso) (M) over dot(iso) greater than or similar to 10(51) erg M-circle dot s(-2) and (E) over dot(iso) greater than or similar to 2 x 10(52) erg s(-1) (if the wind Lorentz factor Gamma(w) similar to 1) or (E) over dot(iso) greater than or similar to 7 x 10(52) erg s(-1) (if Gamma(w) >> 1). In Supernova 1998bw, Ni-56 (similar to 0.4 M-circle dot) is probably produced in the shocked stellar mantle, not in the wind. The expected natures of SNe, e. g. ejected Ni-56 mass and ejecta mass, vary depending on (E) over dot(iso) and (M) over dot(iso). The sequence of the SN properties from high (E) over dot(iso) and (M) over dot(iso) to low (E) over dot(iso) and (M) over dot(iso) is as follows: Supernova 1998bw-like - intermediate case - low mass ejecta (less than or similar to 1 M-circle dot) where Ni-56 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.
- 出版日期2009-4-11
- 单位中国科学院国家天文台
