Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...565..405m&link_type=abstract
The Astrophysical Journal, Volume 565, Issue 1, pp. 405-412.
Astronomy and Astrophysics
Astronomy
139
Gamma Rays: Bursts, Line: Profiles, Nuclear Reactions, Nucleosynthesis, Abundances, Supernovae: Individual (Sn 1998Bw)
Scientific paper
Aspherical explosion models for the hypernova (hyperenergetic 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, 64Zn/Fe] in the ejecta. The nebular line profiles of the Fe-dominated blend near 5200 Å and of [O I] 6300, 6363 Å are 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.
Hachisu Izumi
Maeda Kei--ichi
Mazzali Paolo A.
Nakamura Takayoshi
Nomoto Ken'ichi
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