The Carnegie Supernova Project: Second Photometry Data Release of Low-Redshift Type Ia Supernovae

TL;DR

This paper presents the second photometry data release of low-redshift Type Ia supernovae from the Carnegie Supernova Project, including optical and near-infrared light curves, calibration results, and a new peculiar supernova discovery.

Contribution

It provides a comprehensive dataset of 50 low-redshift SNe Ia with detailed optical and near-infrared photometry, calibration, and a new peculiar supernova discovery.

Findings

50 supernovae with optical and near-infrared light curves

Calibration of optical bandpasses with ~1% accuracy

Discovery of a peculiar SN Ia, SN 2006ot

Abstract

The Carnegie Supernova Project (CSP) was a five-year observational survey conducted at Las Campanas Observatory that obtained, among other things, high-quality light curves of ~100 low-redshift Type Ia supernovae (SNe Ia). Presented here is the second data release of nearby SN Ia photometry consisting of 50 objects, with a subset of 45 having near-infrared follow-up observations. Thirty-three objects have optical pre-maximum coverage with a subset of 15 beginning at least 5 days before maximum light. In the near-infrared, 27 objects have coverage beginning before the epoch of B-band maximum, with a subset of 13 beginning at least 5 days before maximum. In addition, we present results of a photometric calibration program to measure the CSP optical (uBgVri)bandpasses with an accuracy of ~1%. Finally, we report the discovery of a second SN Ia, SN 2006ot, similar in its characteristics to the peculiar SN 2006bt.