Revisiting the Lick Observatory Supernova Search Volume-Limited Sample: Updated Classifications and Revised Stripped-Envelope Supernova Fractions
Isaac Shivvers, Maryam Modjaz, Weikang Zheng, Yuqian Liu, Alexei V., Filippenko, Jeffrey M. Silverman, Thomas Matheson, Andrea Pastorello, Or, Graur, Ryan J. Foley, Ryan Chornock, Nathan Smith, Jesse Leaman, Stefano, Benetti

TL;DR
This study re-evaluates supernova classifications in the LOSS sample, updating subtype fractions and identifying new peculiar objects, thereby refining our understanding of local supernova populations.
Contribution
It provides revised classifications and subtype fractions for the LOSS volume-limited supernova sample, especially for stripped-envelope supernovae, based on improved spectroscopic data.
Findings
Higher SN Ib fraction than previously estimated.
Lower SN Ic fraction than previous studies.
Identification of SN 2005io as SN 1987A-like.
Abstract
We re-examine the classifications of supernovae (SNe) presented in the Lick Observatory Supernova Search (LOSS) volume-limited sample with a focus on the stripped-envelope SNe. The LOSS volume-limited sample, presented by Leaman et al. (2011) and Li et al. (2011b), was calibrated to provide meaningful measurements of SN rates in the local universe; the results presented therein continue to be used for comparisons to theoretical and modeling efforts. Many of the objects from the LOSS sample were originally classified based upon only a small subset of the data now available, however, and recent studies have both updated some subtype distinctions and improved our ability to perform robust classications, especially for stripped-envelope SNe. We re-examine the spectroscopic classifications of all events in the LOSS volume-limited sample (180 SNe and SN impostors) and update them if…
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