Abstract
Features in nucleosynthesis and emission processes in jet‐like aspherical hypernova explosions are presented. The aspherical model yields large (Co, Zn)/Fe and small (Mn, Cr)/Fe as are consistent with abundance patterns in metal‐poor halo stars, indicating important contribution of hypernovae in the early Galactic chemical evolution. The same model also yields large amount of 44Ti. As for emission features, this model is found to reproduce successfully the optical light curve and spectra of hypernova SN 1998bw. The viewing angle is close to the polar direction. The same model explains a peculiar [OI] 6300A profile observed in SN 2003jd, only if the viewing angle is different from that for SN 1998bw. These analyses support the validity of the aspherical models, therefore the use of the models as a reference model for hypernova nucleosynthesis. In addition, theoretical prediction is presented for high energy emissions from the decays of56Ni and56Co.
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