r-process nucleosynthesis in neutrino-driven winds from a typical neutron star with M = 1.4 M

M. Terasawa, K. Sumiyoshi, S. Yamada, H. Suzuki, T. Kajino

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We study the effects of the outer boundary conditions in neutrino-driven winds on r-process nucleosynthesis. We perform numerical simulations of hydrodynamics of neutrino-driven winds and nuclear reaction network calculations. As an outer boundary condition of hydrodynamic calculations, we set a pressure upon the outermost layer of the wind, which is approaching toward the shock wall. Varying the boundary pressure, we obtain various asymptotic thermal temperatures of expanding material in the neutrino-driven winds for resulting nucleosynthesis. We find that a slightly lower asymptotic temperature reduces the charged particle reaction rates and the resulting amount of seed elements and leads to a high neutron-to-seed ratio for a successful r-process abundance pattern, which is in reasonable agreement with the solar system r-process abundance pattern. As a result, the asymptotic temperature, slightly lower than those in previous studies of neutrino-driven winds, can lead to a successful r-process even for the typical proto-neutron star mass MNS ∼ 1.4 M. We also explore the relation between the boundary condition and the neutron star mass, which is related to the progenitor mass, for a successful r-process.

Original languageEnglish
Pages (from-to)L137-L140
JournalAstrophysical Journal
Volume578
Issue number2 II
DOIs
Publication statusPublished - 2002 Oct 20

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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