The Carnegie Supernova Project I: Third Photometry Data Release of Low-Redshift Type Ia Supernovae and Other White Dwarf Explosions

TL;DR

This paper presents a comprehensive dataset of optical and near-infrared photometry for 134 low-redshift supernovae, including Type Ia and other white dwarf explosions, collected over five years as part of the Carnegie Supernova Project I.

Contribution

It provides the final data release with detailed photometry, calibration, and analysis methods, enhancing resources for supernova cosmology and progenitor studies.

Findings

High-quality photometry for 134 supernovae across optical and near-infrared bands.

Stable calibration and color terms over five years of observations.

Calibration of Y-band magnitudes for standard stars.

Abstract

We present final natural system optical (ugriBV) and near-infrared (YJH) photometry of 134 supernovae (SNe) with probable white dwarf progenitors that were observed in 2004-2009 as part of the first stage of the Carnegie Supernova Project (CSP-I). The sample consists of 123 Type Ia SNe, 5 Type Iax SNe, 2 super-Chandrasekhar SN candidates, 2 Type Ia SNe interacting with circumstellar matter, and 2 SN 2006bt-like events. The redshifts of the objects range from z = 0.0037 to 0.0835; the median redshift is 0.0241. For 120 (90%) of these SNe, near-infrared photometry was obtained. Average optical extinction coefficients and color terms are derived and demonstrated to be stable during the five CSP-I observing campaigns. Measurements of the CSP-I near-infrared bandpasses are also described, and near-infrared color terms are estimated through synthetic photometry of stellar atmosphere models. Optical and near-infrared magnitudes of local sequences of tertiary standard stars for each supernova are given, and a new calibration of Y-band magnitudes of the Persson et al. (1998) standards in the CSP-I natural system is presented.