Explosive nucleosynthesis in axisymmetrically deformed type II supernovae

Shigehiro Nagataki, Masa Aki Hashimoto, Katsuhiko Sato, Shoichi Yamada

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

Explosive nucleosynthesis under the axisymmetric explosion in Type II supernovae has been examined by means of two-dimensional hydrodynamic calculations. We have compared the results with the observations of SN 1987A. Our chief findings are as follows: (1) 44Ti is synthesized in a sufficient amount to explain the tail of the bolometric light curve of SN 1987A. We think this is because the alpha-rich freezeout takes place more actively under the axisymmetric explosion. (2) 57Ni and 58Ni tend to be overproduced compared with the observations. However, this tendency relies strongly on the model of the progenitor. We have also compared the abundance of each element in the mass number range A = 16-73 with the solar values. We have found three outstanding features, (1) For the nuclei in the range A = 16-40, their abundances are insensitive to the initial form of the shock wave. This insensitivity is favored since the spherical calculations thus far can explain the solar system abundances in this mass range. (2) There is an enhancement around A = 45 in the axisymmetric explosion that compares fairly well with that of the spherical explosion. In particular, 44Ca, which is underproduced in the present spherical calculations, is enhanced significantly. (3) In addition, there is an enhancement around A = 65. This feature relies on the form not of the mass cut but of the initial shock wave. This enhancement may cause the problem of overproduction in this mass range, although this effect would be relatively small since Type I supernovae are chiefly responsible for this mass number range.

Original languageEnglish
Pages (from-to)1026-1035
Number of pages10
JournalAstrophysical Journal
Volume486
Issue number2 PART I
DOIs
Publication statusPublished - 1997
Externally publishedYes

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nuclear fusion
supernovae
explosive
explosions
explosion
shock wave
augmentation
shock waves
solar system
light curve
tendencies
hydrodynamics
nuclei
causes
sensitivity
calculation

Keywords

  • Nuclear reactions, nucleosynthesis, abundances
  • Supernovae: general
  • Supernovae: individual (SN 1987A)

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Explosive nucleosynthesis in axisymmetrically deformed type II supernovae. / Nagataki, Shigehiro; Hashimoto, Masa Aki; Sato, Katsuhiko; Yamada, Shoichi.

In: Astrophysical Journal, Vol. 486, No. 2 PART I, 1997, p. 1026-1035.

Research output: Contribution to journalArticle

Nagataki, Shigehiro ; Hashimoto, Masa Aki ; Sato, Katsuhiko ; Yamada, Shoichi. / Explosive nucleosynthesis in axisymmetrically deformed type II supernovae. In: Astrophysical Journal. 1997 ; Vol. 486, No. 2 PART I. pp. 1026-1035.
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