Optical Spectra of 73 Stripped-Envelope Core-Collapse Supernovae
Maryam Modjaz, Stephane Blondin, Robert P. Kirshner, Tom Matheson,, Perry Berlind, Federica B. Bianco, Mike L. Calkins, Pete Challis, Peter, Garnavich, Malcolm Hicken, Saurabh Jha, Yuqian. Liu, and G. Howie Marion

TL;DR
This paper presents the most extensive optical spectral library of 73 stripped-envelope core-collapse supernovae, covering early to late phases, enabling detailed study of their spectral diversity and comparison with gamma-ray burst SNe.
Contribution
It provides a homogeneous, extensive spectral dataset of 73 supernovae types IIb, Ib, Ic, and broad-lined Ic, including first-time spectra for 53 SNe, spanning from early to late phases.
Findings
Most extensive spectral library of stripped-envelope SNe to date
Includes early and late-time spectra, some as early as 30 days before maximum light
Data enables future studies of spectral diversity and SN-GRB connections
Abstract
We present 645 optical spectra of 73 supernovae (SNe) of Types IIb, Ib, Ic, and broad-lined Ic. All of these types are attributed to the core collapse of massive stars, with varying degrees of intact H and He envelopes before explosion. The SNe in our sample have a mean redshift <cz> = 4200 km/s. Most of these spectra were gathered at the Harvard-Smithsonian Center for Astrophysics (CfA) between 2004 and 2009. For 53 SNe, these are the first published spectra. The data coverage range from mere identification (1-3 spectra) for a few SNe to extensive series of observations (10-30 spectra) that trace the spectral evolution for others, with an average of 9 spectra per SN. For 44 SNe of the 73 SNe presented here, we have well-determined dates of maximum light to determine the phase of each spectrum. Our sample constitutes the most extensive spectral library of stripped-envelope SNe to date.…
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