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Binary population synthesis (BPS) employs prescriptions to predict finalfates, explosion or implosion, and remnant masses based on one or two stellarparameters at the evolutionary cutoff imposed by the code, usually at or nearcentral carbon ignition. In doing this, BPS disregards the integral rolelate-stage evolution plays in determining the final fate, remnant type, andremnant mass within the neutrino-driven explosion paradigm. To highlightdifferences between a popular prescription which relies only on the core andfinal stellar mass and emerging methods which rely on a star's presupernovacore structure, we generate a series of compact object distributions usingthree different methods for a sample population of single and binary starscomputed in BPASS. The first method estimates remnant mass based on a star'scarbon-oxygen (CO) core mass and final total mass. The second method uses thepresupernova core structure based on the bare CO-core models of \citet{Pat20}combined with a parameterized explosion criterion to first determine final fateand remnant type, then remnant mass. The third method associates presupernovahelium-core masses with remnant masses determined from public explosion modelswhich rely implicitly on core structure. We find that the core-/finalmass-based prescription favors lower mass remnants, including a largepopulation of mass gap black holes, and predicts neutron star masses which spana wide range, whereas the structure-based prescriptions favor slightly highermass remnants, mass gap black holes only as low as 3.5 \Msun, and predictneutron star mass distributions which cluster in a narrow range.

Comparing Compact Object Distributions from Mass- and Presupernova Core Structure-based Prescriptions