Optical Spectroscopy of Type Ia Supernovae by the Carnegie Supernova Projects I and II
The Astrophysical Journal(2024)
Abstract
We present the second and final release of optical spectroscopy of Type Ia
Supernovae (SNe Ia) obtained during the first and second phases of the Carnegie
Supernova Project (CSP-I and CSP-II). The newly released data consist of 148
spectra of 30 SNe Ia observed in the course of the CSP-I, and 234 spectra of
127 SNe Ia obtained during the CSP-II. We also present 216 optical spectra of
46 historical SNe Ia, including 53 spectra of 30 SNe Ia observed by the
Calán/Tololo Supernova Survey. We combine these observations with previously
published CSP data and publicly-available spectra to compile a large sample of
measurements of spectroscopic parameters at maximum light, consisting of
pseudo-equivalent widths and expansion velocities of selected features, for 232
CSP and historical SNe Ia (including more than 1000 spectra). Finally, we
review some of the strongest correlations between spectroscopic and photometric
properties of SNe Ia. Specifically, we define two samples: one consisting of
SNe Ia discovered by targeted searches (most of them CSP-I objects) and the
other composed of SNe Ia discovered by untargeted searches, which includes most
of the CSP-II objects. The analysed correlations are similar for both samples.
We find a larger incidence of SNe Ia belonging to the Cool (CL)and Broad Line
(BL) Branch subtypes among the events discovered by targeted searches, Shallow
Silicon (SS) SNe Ia are present with similar frequencies in both samples, while
Core Normal (CN) SNe Ia are more frequent in untargeted searches.
MoreTranslated text
Key words
Supernovae,Spectroscopy
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