159 articles – 2004 Notices  [english version]
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Astronomical Journal 131 (2006) 960-972
Photometric Selection of High-Redshift Type Ia Supernovae Candidates
M. Sullivan, D.A. Howell, K. Perrett, P. Nugent, P. Astier1, E. Aubourg2, 3, D. Balam, S. Basa, R. Carlberg, A. Conley, S. Fabbro, D. Fouchez4, J. Guy1, I. Hook, H. Lafoux, J.D. Neill, R. Pain1, N. Palanque-Delabrouille, C. Pritchet, N. Regnault1, J. Rich, Richard Taillet1, G. Aldering, S. Baumont1, J. Bronder, M. Filiol, R. Knop, S. Perlmutter, C. Tao4
SNLS Collaboration(s)

We present a method for selecting high-redshift type Ia supernovae (SNe Ia) located via rolling SN searches. The technique, using both color and magnitude information of events from only 2-3 epochs of multi-band real-time photometry, is able to discriminate between SNe Ia and core collapse SNe. Furthermore, for the SNe Ia, the method accurately predicts the redshift, phase and light-curve parameterization of these events based only on pre-maximum-light data. We demonstrate the effectiveness of the technique on a simulated survey of SNe Ia and core-collapse SNe, where the selection method effectively rejects most core-collapse SNe while retaining SNe Ia. We also apply the selection code to real-time data acquired as part of the Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS). During the period May 2004 to January 2005 in the SNLS, 440 SN candidates were discovered of which 70 were confirmed spectroscopically as SNe Ia and 15 as core-collapse events. For this test dataset, the selection technique correctly identifies 100% of the identified SNe II as non-SNe Ia with only a 1-2% false rejection rate. The predicted parameterization of the SNe Ia has a precision of |delta_z|/(1+z_spec)<0.09 in redshift, and +/- 2-3 rest-frame days in phase, providing invaluable information for planning spectroscopic follow-up observations. We also investigate any bias introduced by this selection method on the ability of surveys such as SNLS to measure cosmological parameters (e.g., w and omega matter), and find any effect to be negligible.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
2 :  APC - UMR 7164 - AstroParticule et Cosmologie
3 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
4 :  CPPM - Centre de Physique des Particules de Marseille
APC - Cosmologie et Gravitation
Planète et Univers/Astrophysique

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

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