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arXiv 0908.0247astro-ph.SR
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晚期超新星光变曲线：内部转换和俄歇电子的影响

Late-time supernova light curves: The effect of internal conversion and Auger electrons

I. R. Seitenzahl, S. Taubenberger, S. A. Sim

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6 pages, 2 figures, 1 table, MNRAS in press, v2 with updated references
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摘要：

放射性衰变释放的能量对超新星的光变曲线有很大的贡献。以前的工作考虑了56 Ni、56 Co、57 Ni、57 Co、44 Ti和44 Sc产生的γ射线和正电子沉积的能量，在解释核心坍缩和热核超新星的光变曲线方面非常成功。我们指出俄歇电子和内转换电子以及相关的X射线级联，构成了一个额外的热源。当超新星对伽马射线透明时，这些电子可以对合理的核合成产额的光变曲线做出显着贡献。特别是，57 Co衰变中发射的电子，主要是由于从子体57 Fe中偶然低的3/2态的内部转换，构成了额外的重要能量沉积通道。我们表明，当这些电子加热占，SN 1998 bw的光变曲线自然得到典型的超超新星核合成产量的放缓。此外，我们表明，对于一般的Ia型超新星的产量，俄歇电子发射的基态到基态的电子捕获衰变的55 Fe超过了能量释放的44 Ti衰变链爆炸后多年。

英文摘要：

Energy release from radioactive decays contributes significantly to supernova light curves. Previous works, which considered the energy deposited by gamma-rays and positrons produced by 56Ni, 56Co, 57Ni, 57Co, 44Ti and 44Sc, have been quite successful in explaining the light curves of both core collapse and thermonuclear supernovae. We point out that Auger and internal conversion electrons together with the associated X-ray cascade, constitute an additional heat source. When a supernova is transparent to gamma-rays, these electrons can contribute significantly to light curves for reasonable nucleosynthetic yields. In particular, the electrons emitted in the decay of 57Co, which are largely due to internal conversion from a fortuitously low-lying 3/2- state in the daughter 57Fe, constitute an additional significant energy deposition channel. We show that when the heating by these electrons is accounted for, a slow-down in the lightcurve of SN 1998bw is naturally obtained for typical hypernova nucleosynthetic yields. Additionally, we show that for generic Type Ia supernova yields, the Auger electrons emitted in the ground-state to ground-state electron capture decay of 55Fe exceed the energy released by the 44Ti decay chain for many years after the explosion.

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