Volume 443, Number 3, December I 2005
|Page(s)||781 - 791|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 November 2005|
SALT: a spectral adaptive light curve template for type Ia supernovae
Laboratoire de Physique Nucléaire et des Hautes Énergies, IN2P3, CNRS, Universités Paris VI et Paris VII, 4 place Jussieu, Tour 33, Rez de chaussée, 75252 Paris Cedex 05, France e-mail: email@example.com
Accepted: 23 June 2005
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 around the Hubble line.
Key words: supernovae: general / cosmology: observations
© ESO, 2005
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