Abstract: Stripped-envelope supernovae (SE-SNe) are a subset of core-collapse supernovae where the progenitor star has experienced severe mass loss during its evolution. The resulting pre-explosion star contains little or no hydrogen or helium at the moment of core-collapse, and this is visible in its photometric and spectroscopic evolution. They are an important component in the evolution of their local galactic environment and are the primary source of neutron star/black hole binaries in the Universe. However, despite being first identified as a distinct category in the 1980s it is only now that we are beginning to be build samples of sufficient size to investigate the populations properties. In this talk I will present the results of analysis on the largest sample of SE-SNe to dates, which indicates that these SNe have considerable diversity across mass, kinetic energy, specific kinetic energy, luminosity, temporal characteristics, and host environment. These results will then be linked back to some of the key questions in the field; what kind of progenitors give rise to these events and what kind of evolutionary pathways are available? How is mass lost and is there an indication as to the time-scales involved? How do SE-SNe link with other CC-SNe, superluminous-SNe, gamma-ray bursts, and strong sources of gravitational waves?

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