The progenitors and circumstellar environments of stripped-envelope interacting supernovae from bpass

Understanding the progenitors of stripped-envelope interacting supernovae (SEISNe) is crucial for probing the final stages of massive star evolution. Despite this, their rarity means the nature of their progenitors remains poorly constrained. We investigate the progenitors of SEISNe, using the Binary Population and Spectral Synthesis stellar evolution models. The 30 153 stellar models that result in hydrogen-poor core-collapse supernovae (SNe) includes both binary and single stars, spanning 13 metallicities ($Z=10^{-5}$ to 0.04). Circumstellar material (CSM) formation during their last 100 kyr is reconstructed from line-driven and Roche lobe overflow (RLOF) mass-loss using three scenarios for the CSM, one looking at a wind only distribution for the CSM, and two involving the formation of a circum-binary disc (CBD). Light curve parameters from each scenario are calculated using an analytical model and fiducial SN explosion parameters. We find only the two CBD scenarios, and consequently no single star models, reproduce the luminosities and rise times of observed SEISNe. The inferred rates are comparable to observations. Expected progenitors were only found in models with ZAMS masses of $14\text{-}40\,$ M$_{\odot }$ at $\ge Z_\odot$ and $30\text{-}40\,$ M$_{\odot }$ at $\lt Z_\odot$. Modelling the radio emissions shows that early ($\le 8\,$ d) and high frequency ($\ge 70\,$ GHz) observations are required to constrain the nature of CBDs in these systems. These results indicate that, without phenomena such as eruptive mass-loss, SEISNe require massive stars in binary systems in order to produce sufficient masses of CSM and confine them close to the progenitor.