THE CARNEGIE SUPERNOVA PROJECT: FIRST PHOTOMETRY DATA RELEASE OF LOW-REDSHIFTTYPE Ia SUPERNOVAE

摘要

The Carnegie Supernova Project (CSP) is a five-year survey being carried out at the Las Campanas Observatory toobtain high-quality light curves of ~100 low-redshift Type Ia supernovae (SNe Ia) in a well-defined photometricsystem. Here we present the first release of photometric data that contains the optical light curves of 35 SNe Ia, andnear-infrared light curves for a subset of 25 events. The data comprise 5559 optical (ugriBV) and 1043 near-infrared(YJHKS) data points in the natural system of the Swope telescope. Twenty-eight SNe have pre-maximum data, and for15 of these, the observations begin at least 5 days before B maximum. This is one of the most accurate data sets of low-redshift SNe Ia published to date. When completed, the CSP data set will constitute a fundamental reference for pre-cise determinations of cosmological parameters, and serve as a rich resource for comparison with models of SNe Ia.