R-Process Nucleosynthesis In Neutrino-Driven Winds From A Typical Neutron Star With M = 1.4 Msun

Abstract

We study the effects of the outer boundary conditions in neutrino-driven winds on the r-process nucleosynthesis. We perform numerical simulations of hydrodynamics of neutrino-driven winds and nuclear reaction network calculations of the r-process. 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 temperature of expanding material in the neutrino-driven winds for resulting nucleosynthesis. We find that the asymptotic temperature slightly lower than those used in the previous studies of the neutrino-driven winds can lead to a successful r-process abundance pattern, which is in a reasonable agreement with the solar system r-process abundance pattern even for the typical proto-neutron star mass Mns ~ 1.4 Msun. A slightly lower asymptotic temperature reduces the charged particle reaction rates and the resulting amount of seed elements and lead to a high neutron-to-seed ratio for successful r-process. This is a new idea which is different from the previous models of neutrino-driven winds from very massive (Mns ~ 2.0 Msun) and compact (Rns ~ 10 km) neutron star to get a short expansion time and a high entropy for a successful r-process abundance pattern. Although such a large mass is sometimes criticized from observational facts on a neutron star mass, we dissolve this criticism by reconsidering the boundary condition of the wind. We also explore the relation between the boundary condition and neutron star mass, which is related to the progenitor mass, for successful r-process.

14 pages, 2 figures

References in corpus (16)

• Relativistic Equation of State of Nuclear Matter for Supernova and Neutron Star
• Nucleosynthesis in neutrino-driven winds: I. The physical conditions
• Neutron Star Mass Measurements. I. Radio Pulsars
• Relativistic Equation of State of Nuclear Matter for Supernova Explosion
• The Neutron Star and Black Hole Initial Mass Function
• Measurement of stellar age from uranium decay
• The r-Process Enriched Low Metallicity Giant HD 115444
• Evidence of Multiple r-Process Sites in the Early Galaxy: New Observations of CS 22892-052
• General relativistic effects on neutrino-driven wind from young, hot neutron star and the r-process nucleosynthesis
• Massive Stars in the Range $13-25{\mathrm{M}}_{\odot }$: Evolution and Nucleosynthesis. II. the Solar Metallicity Models
• New Nuclear Reaction Flow during r-Process Nucleosynthesis in Supernovae: Critical Role of Light Neutron-Rich Nuclei
• The mass of the neutron star in Vela X-1
• A New Algorithm for Supernova Neutrino Transport and Some Applications
• An Implicit Lagrangean Code for Spherically Symmetric General Relativistic Hydrodynamics with an Approximate Riemann Solver
• On the formation of low-mass black holes in massive binary stars
• Hydrodynamical study of neutrino-driven wind as an r-process site

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