General relativistic effects on neutrino-driven wind from young, hot neutron star and the r-process nucleosynthesis

Abstract

Neutrino-driven wind from young hot neutron star, which is formed by supernova explosion, is the most promising candidate site for r-process nucleosynthesis. We study general relativistic effects on this wind in Schwarzschild geometry in order to look for suitable conditions for a successful r-process nucleosynthesis. It is quantitatively discussed that the general relativistic effects play a significant role in increasing entropy and decreasing dynamic time scale of the neutrino-driven wind. Exploring wide parameter region which determines the expansion dynamics of the wind, we find interesting physical conditions which lead to successful r-process nucleosynthesis. The conditions which we found realize in the neutrino-driven wind with very short dynamic time scale ${\tau }_{\mathrm{dyn}}\sim 6$ ms and relatively low entropy $S\sim 140$. We carry out the $\alpha$-process and r-process nucleosynthesis calculation on these conditions by the use of our single network code including over 3000 isotopes, and confirm quantitatively that the second and third r-process abundance peaks are produced in the neutrino-driven wind.

Accepted for publication in ApJ

References in corpus (3)

• Enrichment of the r-process Element Europium in the Galactic Halo
• Neutrino Capture and r-Process Nucleosynthesis
• General Relativistic Augmentation of Neutrino Pair Annihilation Energy Deposition Near Neutron Stars

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