Process in prompt supernova explosions revisited

K. Sumiyoshi, M. Terasawa, G. J. Mathews, T. Kajino, Shoichi Yamada, H. Suzuki

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

We reanalyze r-process nucleosynthesis in the neutron-rich ejecta from a prompt supernova explosion of a low-mass (11 M) progenitor. Although it has not yet been established that a prompt explosion can occur, it is not yet ruled out as a possibility for low-mass supernova progenitors. Moreover, there is mounting evidence that a new r-process site may be required. Hence, we assume that a prompt explosion can occur and make a study of r-process nucleosynthesis in the supernova ejecta. To achieve a prompt explosion we have performed a general relativistic hydrodynamic simulation of adiabatic collapse and bounce using a relativistic nuclear-matter equation of state. The electron fraction Ye during the collapse was fixed at the initial-model value. The size of the inner collapsing core was then large enough to enable a prompt explosion to occur in the hydrodynamic calculation. Adopting the calculated trajectories of promptly ejected material, we explicitly computed the burst of neutronization due to electron captures on free protons in the photodissociated ejecta after the passage of the shock. The thermal and compositional evolution of the resulting neutron-rich ejecta originating from near the surface of the proto-neutron star was obtained. These were used in nuclear reaction network calculations to evaluate the products of r-process nucleosynthesis. We find that, unlike earlier studies of nucleosynthesis in prompt supernovae, the amount of r-process material ejected per supernova is quite consistent with observed Galactic r-process abundances. Furthermore, the computed r-process abundances are in good agreement with solar abundances of r-process elements for A > 100. This suggests that prompt supernovae are still viable r-process sites. Such events may be responsible for the abundances of the heaviest r-process nuclei.

Original languageEnglish
Pages (from-to)880-886
Number of pages7
JournalAstrophysical Journal
Volume562
Issue number2 PART II
DOIs
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

supernovae
explosions
explosion
ejecta
nuclear fusion
hydrodynamics
electron
inner core
neutrons
equation of state
mounting
electron capture
nuclear reactions
neutron stars
trajectory
bursts
equations of state
shock
trajectories
nuclei

Keywords

  • Nuclear reactions, nucleosynthesis, abundances
  • Stars: abundances
  • Stars: neutron
  • Supernovae: general

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Sumiyoshi, K., Terasawa, M., Mathews, G. J., Kajino, T., Yamada, S., & Suzuki, H. (2001). Process in prompt supernova explosions revisited. Astrophysical Journal, 562(2 PART II), 880-886. https://doi.org/10.1086/323524

Process in prompt supernova explosions revisited. / Sumiyoshi, K.; Terasawa, M.; Mathews, G. J.; Kajino, T.; Yamada, Shoichi; Suzuki, H.

In: Astrophysical Journal, Vol. 562, No. 2 PART II, 2001, p. 880-886.

Research output: Contribution to journalArticle

Sumiyoshi, K, Terasawa, M, Mathews, GJ, Kajino, T, Yamada, S & Suzuki, H 2001, 'Process in prompt supernova explosions revisited', Astrophysical Journal, vol. 562, no. 2 PART II, pp. 880-886. https://doi.org/10.1086/323524
Sumiyoshi K, Terasawa M, Mathews GJ, Kajino T, Yamada S, Suzuki H. Process in prompt supernova explosions revisited. Astrophysical Journal. 2001;562(2 PART II):880-886. https://doi.org/10.1086/323524
Sumiyoshi, K. ; Terasawa, M. ; Mathews, G. J. ; Kajino, T. ; Yamada, Shoichi ; Suzuki, H. / Process in prompt supernova explosions revisited. In: Astrophysical Journal. 2001 ; Vol. 562, No. 2 PART II. pp. 880-886.
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