The Carnegie Supernova Project: Analysis of the First Sample of Low-Redshift Type-Ia Supernovae

Details The Carnegie Supernova Project: Analysis of the First Sample of Low-Redshift Type-Ia Supernovae The Carnegie Supernova Project: Analysis of the First Sample of Low-Redshift Type-Ia Supernovae

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21442703f&link_type=abstract

American Astronomical Society, AAS Meeting #214, #427.03; Bulletin of the American Astronomical Society, Vol. 41, p.696

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Scientific paper

We present the analysis of the first set of 35 low-redshift (z<0.08) Type Ia supernovae studied by the Carnegie Supernova Project. The data consist of densely-sampled, high-precision light curves obtained with a uniform, well-characterized photometric system comprising the ugriBVYJHKs bands. We use these data to derive light-curve parameters and to build template light curves that are applicable for fitting other Type-Ia supernova data. We calibrate the intrinsic colors at maximum light. This is used to derive color excesses and thus study the properties of the reddening law in the host galaxies, with the advantage of combining optical and NIR bands. We study the calibration of absolute peak magnitudes in all bands using a two-parameter bilinear fit to decline rates and colors or, alternatively, color excesses. We obtain dispersions of 0.1_ 0.2 mag, depending on the filter--color combinations, and low values of the reddening-law parameter RV 1_ 2. We further investigate the validity of Type-Ia supernovae as true standard candles in the NIR, requiring no correction for decline rate.

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