A Set of Nearby SNe Ia Lightcurves

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Scientific paper

Type Ia SNe represent the best distance indicators for cosmology, having established the presence of dark energy through measurement of the expansion history of the universe. While high-z SNe are used to study the change in the expansion rate, low-z SNe establish a baseline for brightness comparisons and provide the important calibration used for standardization. Besides the statistical gain in precision from a large number of SNe, a good understanding of their systematic variations is essential. We present the B, V, R, I lightcurves for a new sample of nearby supernova, obtained by the Supernova Cosmology Project in collaboration with several other supernova groups. A unique challenge of this dataset is that seventeen different instruments were used to obtain the follow-up photometry. Therefore, we focus in particular on the analysis procedure developed for handling and cross-calibrating the data from various instruments.
This work was supported in part by the U.S. Department of Energy under Contract No. DE-AC03-76SF00098.

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