Different to the core: the pre-supernova structures of massive single and binary-stripped stars

TL;DR

This study compares the pre-supernova structures of single and binary-stripped massive stars, revealing significant differences in core composition and density profiles that impact supernova outcomes and nucleosynthesis.

Contribution

It provides a systematic analysis of how binary mass transfer alters pre-supernova core structures compared to single-star models, with new diagrams illustrating isotope distributions.

Findings

Binary-stripped stars have extended C, O, Ne gradients at core edges.

Binary models show higher total carbon mass at collapse.

Silicon and oxygen layers often merge post-core silicon burning.

Abstract

The majority of massive stars live in binary or multiple systems and will interact during their lifetimes, which helps to explain the observed diversity of core-collapse supernovae. Donor stars in binary systems can lose most of their hydrogen-rich envelopes through mass transfer, which not only affects the surface properties, but also the core structure. However, most calculations of the core-collapse properties of massive stars rely on single-star models. We present a systematic study of the difference between the pre-supernova structures of single stars and stars of the same initial mass (11 - 21\Msun) that have been stripped due to stable post-main sequence mass transfer at solar metallicity. We present the pre-supernova core composition with novel diagrams that give an intuitive representation of the isotope distribution. As shown in previous studies, at the edge of the carbon-oxygen core, the binary-stripped star models contain an extended gradient of carbon, oxygen, and neon. This layer originates from the receding of the convective helium core during core helium burning in binary-stripped stars, which does not occur in single-star models. We find that this same evolutionary phase leads to systematic differences in the final density and nuclear energy generation profiles. Binary-stripped star models have systematically higher total masses of carbon at the moment of core collapse compared to single star models, which likely results in systematically different supernova yields. In about half of our models, the silicon-burning and oxygen-rich layers merge after core silicon burning. We discuss the implications of our findings for the explodability, supernova observations, and nucleosynthesis from these stars. Our models will be publicly available and can be readily used as input for supernova simulations. [Abridged]