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

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arxiv 0910.3330 v1 pith:LN7XGN7O submitted 2009-10-17 astro-ph.CO

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

Carlos Contreras , Mario Hamuy , M. M. Phillips , Gaston Folatelli , Nicholas B. Suntzeff , S. E. Persson , Maximilian Stritzinger , Luis Boldt
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Sergio Gonzalez Wojtek Krzeminski Nidia Morrell Miguel Roth Francisco Salgado Maria Jose Maureira Christopher R. Burns W. L. Freedman Barry F. Madore David Murphy Pamela Wyatt Weidong Li Alexei V. Filippenko
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The Carnegie Supernova Project (CSP) is a five-year survey being carried out at the Las Campanas Observatory to obtain high-quality light curves of ~100 low-redshift Type Ia supernovae in a well-defined photometric system. Here we present the first release of photometric data that contains the optical light curves of 35 Type Ia supernovae, and near-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 supernovae have pre-maximum data, and for 15 of these, the observations begin at least 5 days before B maximum. This is one of the most accurate datasets of low-redshift Type Ia supernovae published to date. When completed, the CSP dataset will constitute a fundamental reference for precise determinations of cosmological parameters, and serve as a rich resource for comparison with models of Type Ia supernovae.

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    SN 2023vjh is an unusually faint 91bg-like SN Ia whose light curves and colors suggest possible CSM extinction despite minimal host interstellar dust signatures.