Journal
ASTRONOMY & ASTROPHYSICS
Volume 443, Issue 3, Pages 781-791Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20053025
Keywords
supernovae : general; cosmology : observations
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We present a new method to parameterize type Ia Supernovae (SN Ia) multi- color light curves. The method was developed in order to analyze the large number of SN Ia multi- color light curves measured in current high-redshift projects. The technique is based on empirically modeling SN Ia luminosity variations as a function of phase, wavelength, a shape parameter, and a color parameter. The model is trained with a sample of well-measured nearby SN Ia and then tested with an independent set of supernovae by building an optimal luminosity distance estimator that combines the supernova rest-frame luminosity, shape parameter, and color reconstructed with the model. The distances we measure using B- and V-band data show a dispersion around the Hubble line comparable or lower than obtained with other methods. With this model, we are able to measure distances using U- and B-band data with a dispersion of 0.16 +/- 0.05 around the Hubble line.
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