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arXiv 0901.0410astro-ph.HEastro-ph.SR
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风驱动超新星爆炸中56 Ni的核合成及其对伽马射线暴中心引擎的约束

Nucleosynthesis of 56Ni in wind-driven Supernova Explosions and Constraints on the Central Engine of Gamma-Ray Bursts

Keiichi Maeda, Nozomu Tominaga

摘要:

理论上预期的性质的超新星驱动的风/喷流进行了讨论。近似的解析公式推导出明确的基本物理过程中所涉及的风/射流驱动爆炸,它表明,爆炸性能的特征在于能量注入率(Edot_iso)和质量注入率(Mdot_iso)。为了解释与伽马射线暴(GRB)980425相关的SN 1998 bw观测结果,需要满足以下条件:Edot_iso Mdot_iso>~10 ^{51} erg M_sun s ^{-2}和Edot_iso>~2 x 10 ^{52} erg s ^{-1}(如果风洛伦兹因子Gamma_w~1)或Edot_iso>~7 x 10 ^{52} erg s ^{-1}(如果Gamma_w>> 1)。在SN 1998bw中,~(56)Ni(~0.4M_sun)可能产生于受冲击的恒星地幔,而不是风。SNe的预期性质,例如,喷出的56Ni质量和喷出物质量根据Edot_iso和Mdot_iso而变化。SN性质从高Edot_iso和Mdot_iso到低Edot_iso和Mdot_iso的顺序如下:SN 1998bw--中等情况--低质量喷出物(<~1M_sun $),其中56Ni来自风--整体塌陷。这种多样性可以解释与伽玛暴相关的超新星的多样性。我们的结果可以用来约束风/喷流的性质,这是联系在一起的中央引擎的伽玛暴,通过研究相关的超新星的属性。

英文摘要:

Theoretically expected natures of a supernova 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 (Edot_iso) and the mass injection rate (Mdot_iso). To explain observations of SN 1998bw associated with Gamma-Ray Burst (GRB) 980425, the following conditions are required: Edot_iso Mdot_iso > ~ 10^{51} erg M_sun s^{-2} and Edot_iso > ~ 2 x 10^{52} erg s^{-1} (if the wind Lorentz factor Gamma_w ~ 1) or Edot_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, vary depending on Edot_iso and Mdot_iso. The sequence of the SN properties from high Edot_iso and Mdot_iso to low Edot_iso and Mdot_iso is the following: SN 1998bw-like -- intermediate case -- low mass ejecta (< ~ 1M_sun$) where 56Ni is from the wind -- whole collapse. This diversity may explain the diversity of supernovae associated with GRBs. Our result can be used to constrain natures of the wind/jet, which is linked to the central engine of GRBs, by studying properties of the associated supernovae.

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