2000/11/01 by Keiichi Maeda, K. Maeda, Tohru Nakamura +12 · 1 citation
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Astrophysics (astro-ph) #Bacillus and Francisella bacterial research #FOS: Physical sciences #Gamma-ray bursts and supernovae #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0011003
14 pages, including 7 eps figures. Expanded with more detailed discussion and additional figures. To appear in the January 2002 issue of ApJ (Vol. 565)
openalex publication_date 2000/11/01 · arxiv created 2001/09/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Aspherical explosion models for the hypernova (hyper-energetic supernova) SN 1998bw are presented. Nucleosynthesis in aspherical explosions is examined with a two-dimensional hydrodynamical code and a detailed nuclear reaction network. Aspherical explosions lead to a strong α-rich freezeout, thus enhancing the abundance ratios [44Ca, 48Ti, and 64Zn / Fe] in the ejecta. The nebular line profiles of the Fe-dominated blend near 5200 Åand of [\OI] 6300,6363 Åare calculated and compared with the observed late time spectra of SN 1998bw. Compared with the spherical model, the unusual features of the observed nebular spectra can be better explained if SN 1998bw is a strongly aspherical explosion with a kinetic energy of ∼ 1052 ergs viewed from near the jet direction.