NuGrid Stellar Data Set. II. Stellar Yields from H to Bi for Stellar Models with Mzams = 1 to 25Msun and Z = 0.0001 to 0.02

TL;DR

This paper extends the NuGrid stellar yield data set to include a broader range of initial masses and lower metallicities, using advanced stellar models to improve nucleosynthesis predictions across different stellar evolution stages.

Contribution

It provides an expanded, detailed set of stellar yields from 1 to 25 solar masses and multiple metallicities, incorporating updated physics and nucleosynthesis calculations for diverse stellar models.

Findings

Convective O-C shell mergers produce odd-Z elements P, Cl, K, Sc.

H-ingestion events at low metallicity lead to i-process nucleosynthesis.

The data set includes comprehensive yield tables and online access.

Abstract

We provide here a significant extension of the NuGrid Set 1 models in mass coverage and toward lower metallicity, adopting the same physics assumptions. The combined data set now includes the initial masses M/Msun = 1, 1.65, 2, 3, 4, 5, 6, 7, 12, 15, 20, 25 for Z = 0.02, 0.01, 0.006, 0.001, 0.0001 with alpha-enhanced composition for the lowest three metallicities. These models are computed with the MESA stellar evolution code and are evolved up to the AGB, the white dwarf stage, or until core collapse. The nucleosynthesis was calculated for all isotopes in post-processing with the NuGrid mppnp code. Explosive nucleosynthesis is based on semi-analytic 1D shock models. Metallicity-dependent mass loss, convective boundary mixing in low- and intermediate mass models and H and He core burning massive star models is included. Convective O-C shell mergers in some stellar models lead to the strong production of odd-Z elements P, Cl, K and Sc. In AGB models with hot dredge-up the convective boundary mixing efficiency is reduced to accommodate for its energetic feedback. In both low-mass and massive star models at the lowest metallicity H-ingestion events are observed and lead to i-process nucleosynthesis and substantial N-15 production. Complete yield data tables, derived data products and online analytic data access are provided.