Nucleosynthesis in neutrino-driven winds in hypernovae

Abstract

We investigate the nucleosynthesis in the neutrino-driven winds blown off from a $3M_{\odot }$ massive proto-neutron star (mPNS) temporarily formed during the collapse of a $100M_{\odot }$ star. Such mPNSs would be formed in hypernovae. We construct steady and spherically symmetric wind solutions. We set large neutrino luminosities of $\sim 10^{53}\mathrm{erg}{\mathrm{s}}^{-1}$ and average energies of electron neutrinos and antineutrinos in the ranges of ${\epsilon }_{{\nu }_e}=9-16\mathrm{MeV}$ and ${\epsilon }_{{\bar{\nu }}_e}=11-18\mathrm{MeV}$ based on a recent numerical relativity simulation. The wind solutions indicate much shorter temperature-decrease timescale than that of the winds from ordinary PNSs and, depending on ${\epsilon }_{\nu }$, the winds can be both neutron-rich and proton-rich. In the neutron-rich wind, the $r$-process occurs and the abundance distribution of a fiducial wind model of the mPNS gives an approximate agreement with the abundance pattern of metal-poor weak $r$ star HD~122563, although the third-peak elements are produced only when the ${\bar{\nu }}_e$ energy is much larger than the ${\nu }_e$ energy. In the proton-rich wind, the strong $\nu p$-process occurs and $A>100$ nuclides are synthesized. The synthesized nuclei can be neutron-rich in some cases because the large neutrino luminosity of the mPNS supplies a sufficient amount of neutrons.

20 pages, 17 figures. Accepted for publication in ApJ

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• Looking for imprints of the first stellar generations in metal-poor bulge field stars
• Impact of hypernova νp-process nucleosynthesis on the galactic chemical evolution of Mo and Ru
• Collective neutrino oscillations and heavy-element nucleosynthesis in supernovae: exploring potential effects of many-body neutrino correlations
• A Consistent Modeling of Neutrino-driven Wind with Accretion Flow onto a Protoneutron Star and its Implications for ${}^{56}$Ni Production
• Near-critical supernova outflows and their neutrino signatures
• Impacts of Black-Hole-Forming Supernova Explosions on the Diffuse Neutrino Background
• Alpha-constrained QSE Nucleosynthesis in High-entropy and Fast-expanding Material
• Neutrinos and Heavy Element Nucleosynthesis
• Proton-rich production of lanthanides: the $\nu i$ process
• Successful $\nu p$-process in neutrino-driven outflows in core-collapse supernovae