Hypernovae and Gamma-Ray Bursts |
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| Authors: | Ken’ichi Nomoto Keiichi Maeda Nozomu Tominaga Takuya Ohkubo Jinsong Deng Paolo A Mazzali |
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| Institution: | (1) Department of Astronomy, School of Science, University of Tokyo, Tokyo, Japan;(2) Research Center for the Early Universe, School of Science, University of Tokyo, Tokyo, Japan;(3) Department of Earth Science and Astronomy, College of Arts and Sciences, University of Tokyo, Tokyo, Japan;(4) INAF-Osservatorio Astronomico, Via Tiepolo, Trieste, Italy |
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| Abstract: | The nature of very energetic supernovae (hypernovae) is discussed. They are the explosive death of stars more massive than
~20–25M
⊙, probably linked to the enigmatic Gamma-Ray Bursts. The optical properties of hypernovae indicate that they are significantly
aspherical. Synthetic light curves and late-phase spectra of aspherical supernova/hypernova models are presented. These models
can account for the optical observations of SNe 1998bw and 2002ap. The abundance patterns of hypernovae are characterized
by large ratios (Zn, Co)/Fe and small ratios (Mn, Cr)/Fe, indicating a significant contribution of hypernovae to the early
Galactic chemical evolution. |
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| Keywords: | Gamma-Ray Bursts supernovae nucleosynthesis extremely metal-poor stars |
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