The p-process in exploding rotating massive stars

TL;DR

This study explores how rotation in massive stars influences p-process nucleosynthesis, revealing that rotating models significantly enhance the production of p-nuclides, especially during supernova explosions, suggesting a larger role for such stars in galactic chemical evolution.

Contribution

It demonstrates the impact of stellar rotation on p-process yields in massive stars, highlighting the importance of rotation and reaction rates in nucleosynthesis modeling.

Findings

p-nuclides are mainly synthesized during supernova explosions

rotation increases s- and p-nuclide yields by 3-4 dex

massive stars with rotation may significantly contribute to galactic p-nuclei

Abstract

The p-process nucleosynthesis can explain proton-rich isotopes that are heavier than iron, which are observed in the Solar System, but discrepancies still persist and important questions concerning the astrophysical site(s) of the p-process remain unanswered. We investigate how the p-process operates in exploding rotating massive stars that have experienced an enhanced s-process nucleosynthesis during their life through rotational mixing. We computed 25 $M_{\odot}$ stellar models at a metallicity of $Z=10^{-3}$ with different initial rotation velocities and rates for the uncertain $^{17}$O($\alpha$,$\gamma$)$^{21}$Ne reaction. The nucleosynthesis calculation, followed with a network of 737 isotopes, was coupled to stellar evolution, and the p-process nucleosynthesis was calculated in post-processing during both the final evolutionary stages and spherical explosions of various energies. In our models, the p-nuclides are mainly synthesized during the explosion, but not much during the ultimate hydrostatic burning stages. The p-process yields mostly depend on the initial number of trans-iron seeds, which in turn depend on the initial rotation. We found that the impact of rotation on the p-process is comparable to the impact of rotation on the s-process. From no to fast rotation, the s-process yields of nuclides with mass number $A<140$ increase by $3-4$ dex, and so do the p-process yields. Fast rotation with a lower $^{17}$O($\alpha,\gamma$) rate significantly produces s- and p-nuclides with $A\geq140$. Our results suggest that the contribution of core-collapse supernovae from massive stars to the solar (and Galactic) p-nuclei has been underestimated in the past, and more specifically, that the contribution from massive stars with sub-solar metallicities may even dominate. A more detailed study including stellar models with a wide range of masses and metallicities remains to be performed.