The Carnegie Supernova Project-I. Optical spectroscopy of stripped-envelope supernovae

TL;DR

This paper presents a comprehensive collection of 170 optical spectra of 35 low-redshift stripped-envelope supernovae, covering a wide temporal range and providing valuable data for understanding their properties.

Contribution

It offers a large, high-quality spectral dataset of stripped-envelope supernovae observed over several years, with detailed classification and phase coverage, available for the community.

Findings

Spectra span from -19 to +322 days relative to B-band maximum.

Spectroscopic classifications follow standard criteria.

Data is publicly available for further analysis.

Abstract

We present 170 optical spectra of 35 low-redshift stripped-envelope core-collapse supernovae observed by the Carnegie Supernova Project-I between 2004 and 2009. The data extend from as early as -19 days (d) prior to the epoch of B-band maximum to +322 d, with the vast majority obtained during the so-called photospheric phase covering the weeks around peak luminosity. In addition to histogram plots characterizing the red-shift distribution, number of spectra per object, and the phase distribution of the sample, spectroscopic classification is also provided following standard criteria. The CSP-I spectra are electronically available and a detailed analysis of the data set is presented in a companion paper being the fifth and final paper of the series