Explosive Nucleosynthesis in Aspherical Hypernova Explosions and Late Time Spectra of SN1998bw

K. Maeda; T. Nakamura; K. Nomoto; P. A. Mazzali; F. Patat; I. Hachisu

Explosive Nucleosynthesis in Aspherical Hypernova Explosions and Late Time Spectra of SN1998bw

Astrophysics 2007-05-23 v2

Authors: K. Maeda , T. Nakamura , K. Nomoto , P. A. Mazzali , F. Patat , I. Hachisu

Abstract

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 $\alpha$ -rich freezeout, thus enhancing the abundance ratios [ $^{44}$ Ca, $^{48}$ Ti, and $^{64}$ Zn / Fe] in the ejecta. The nebular line profiles of the Fe-dominated blend near 5200 \AA and of [\OI] 6300,6363 \AA 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 $\sim 10^{52}$ ergs viewed from near the jet direction.

Keywords

supernovae nucleosynthesis aspherical explosions SN 1998bw hypernovae late-time spectra

Cite

@article{arxiv.astro-ph/0011003,
  title  = {Explosive Nucleosynthesis in Aspherical Hypernova Explosions and Late Time Spectra of SN1998bw},
  author = {K. Maeda and T. Nakamura and K. Nomoto and P. A. Mazzali and F. Patat and I. Hachisu},
  journal= {arXiv preprint arXiv:astro-ph/0011003},
  year   = {2007}
}

Comments

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)

Explosive Nucleosynthesis in Aspherical Hypernova Explosions and Late Time Spectra of SN1998bw

Abstract

Keywords

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