HAL : in2p3-00455318, version 1

arXiv : astro-ph/0506583

Code Bibliographique ADS : 2005A&A...443..781G

DOI : 10.1051/0004-6361:20053025

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Astronomy and Astrophysics 443 (2005) 781-791

SALT: a spectral adaptive light curve template for type Ia supernovae

J. Guy1, P. Astier1, S. Nobili1, N. Regnault1, R. Pain1

SUPERNOVAE Collaboration(s)

(12/2005)

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 0.16±0.05 around the Hubble line.

1 :	LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies

Thème(s)

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Mot(s)-clé(s) : supernovae: general – cosmology: observations

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Contributeur : Julien Guy <>

Soumis le : Mercredi 10 Février 2010, 10:12:54

Dernière modification le : Mercredi 10 Février 2010, 13:10:14