Stripped-envelope stars in different metallicity environments

Stripped-envelope stars can be observed as Wolf-Rayet (WR) stars, or less luminous hydrogen-poor with low mass loss rates and transparent winds. Both types are potential progenitors of Type I core-collapse supernovae (SNe). We use grids models obtained from helium at different metallicities to study the effects metallicity on transients remnants these produce. characterise surface core properties our collapse models, investigate their explodability employing three criteria. In cases where explosions predicted, we estimate ejecta mass, explosion energy, nickel neutron star (NS) mass. Otherwise, predict resulting black hole (BH). construct a simplified population model, find that SNe compact objects depend strongly metallicity. Ejecta masses energies for Ic best reproduced by Z=0.04 which exhibit strong winds during burning. This implies either underestimated, SN experience through other mechanisms before exploding. The distributions masses, Ib not well progenitor WR loss, but better if assume no in luminosities below minimum luminosity. become more common increases, vast majority must transparent-wind stripped-envelope stars. several pre-collapse CO-masses up $\sim 30 M_{\odot}$ may form 3 BHs fallback SNe. carry important consequences understanding SNe, binary BH NS systems, X-ray systems gravitational wave transients.