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SiFTO: An Empirical Method for Fitting SNe Ia Light Curves
Conley A., Sullivan M., Hsiao E.Y., Guy J., Astier P. et al
The Astrophysical Journal 681 (2008) 482-498 - http://hal.in2p3.fr/in2p3-00267304
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
SiFTO: An Empirical Method for Fitting SNe Ia Light Curves
A. Conley, M. Sullivan, E. Y. Hsiao, J. Guy1, P. Astier1, D. Balam, C. Balland1, S. Basa2, 3, R. G. Carlberg, D. Fouchez2, D. Hardin1, D. A. Howell4, I. M. Hook, R. Pain1, K. Perrett, C. J. Pritchet, N. Regnault1
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
CNRS : UMR7585 – IN2P3 – Université Pierre et Marie Curie (UPMC) - Paris VI – Université Paris VII - Paris Diderot
Barre 12-22, 1er étage 4 Place Jussieu 75252 Paris Cedex 05
2 :  CPPM - Centre de Physique des Particules de Marseille
CNRS : UMR7346 – IN2P3 – Université de la Méditerranée - Aix-Marseille II
163, avenue de Luminy - Case 902 - 13288 Marseille cedex 09
3 :  LAM - Laboratoire d'Astrophysique de Marseille
CNRS : UMR6110 – INSU – Université de Provence - Aix-Marseille I
Pôle de l'Étoile Site de Château-Gombert 38, rue Frédéric Joliot-Curie 13388 Marseille cedex 13
4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3
We present SiFTO, a new empirical method for modeling type Ia supernovae (SNe Ia) light curves by manipulating a spectral template. We make use of high-redshift SN observations when training the model, allowing us to extend it bluer than rest frame U. This increases the utility of our high-redshift SN observations by allowing us to use more of the available data. We find that when the shape of the light curve is described using a stretch prescription, applying the same stretch at all wavelengths is not an adequate description. SiFTO therefore uses a generalization of stretch which applies different stretch factors as a function of both the wavelength of the observed filter and the stretch in the rest-frame B band. We compare SiFTO to other published light-curve models by applying them to the same set of SN photometry, and demonstrate that SiFTO and SALT2 perform better than the alternatives when judged by the scatter around the best fit luminosity distance relationship. We further demonstrate that when SiFTO and SALT2 are trained on the same data set the cosmological results agree.

Articles dans des revues avec comité de lecture
The Astrophysical Journal

Accepted for publication in ApJ
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