Dominique Fouchez

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We present distance measurements to 71 high redshift type Ia supernovae discovered during the first year of the 5-year Supernova Legacy Survey (SNLS). These events were detected and their multi-color light-curves measured using the MegaPrime/MegaCam instrument at the Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degree fields(More)
Aims. We present cosmological constraints from a joint analysis of type Ia supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The data set includes several low-redshift samples (z < 0.1), all three seasons from the SDSS-II (0.05 < z < 0.4), and three years from SNLS (0.2 < z < 1), and it totals 740 spectroscopically confirmed(More)
Aims. We present an empirical model of Type Ia supernovae spectro-photometric evolution with time. Methods. The model is built using a large data set including light-curves and spectra of both nearby and distant supernovae, the latter being observed by the SNLS collaboration. We derive the average spectral sequence of Type Ia supernovae and their main(More)
The Supernova Legacy Survey 3-year sample: Type Ia supernovae photometric distances and cosmological constraints , J. Guy1, M. Sullivan2, A. Conley3,4, N. Regnault1, P. Astier1, C. Balland1,5, S. Basa6, R. G. Carlberg4, D. Fouchez7, D. Hardin1, I. M. Hook2,8, D. A. Howell9,10, R. Pain1, N. Palanque-Delabrouille11 , K. M. Perrett4,12, C. J. Pritchet13, J.(More)
Hadronic Z decays into three jets are used to test QCD models of colour reconnection (CR). A sensitive quantity is the rate of gluon jets with a gap in the particle rapidity distribution and zero jet charge. Gluon jets are identified by either energy-ordering or by tagging two b-jets. The rates predicted by two string-based tunable CR models, one(More)
The accelerating expansion of the Universe, and the need for dark energy, were inferred from observations of type Ia supernovae. There is a consensus that type Ia supernovae are thermonuclear explosions that destroy carbon-oxygen white dwarf stars that have accreted matter from a companion star, although the nature of this companion remains uncertain. These(More)
We present a measurement of the distant Type Ia supernova (SN Ia) rate derived from the first 2 yr of the CanadaFrance-Hawaii Telescope Supernova Legacy Survey. We observed four 1 ; 1 fields with a typical temporal frequency of h ti 4 observer-frame days over time spans of 158Y211 days per season for each field, with breaks during the full Moon. We used(More)
We present the first high-redshift Hubble diagram for Type II-P supernovae (SNe II-P) based upon five events at redshift up to z ∼ 0.3. This diagram was constructed using photometry from the Canada-France-Hawaii Telescope Supernova Legacy Survey and absorption line spectroscopy from the Keck observatory. The method used to measure distances to these(More)
Massive stars undergo a violent death when the supply of nuclear fuel in their cores is exhausted, resulting in a catastrophic "core-collapse" supernova. Such events are usually only detected at least a few days after the star has exploded. Observations of the supernova SNLS-04D2dc with the Galaxy Evolution Explorer space telescope reveal a radiative(More)
1 CERN, theory division, CH-1211 Geneva 23, Switzerland 2 Collège de France, Lab. de Physique Corpusculaire, IN2P3-CNRS; FR-75231, Paris Cedex 05, France 3 CPPM, Université d’Aix-Marseille 2, IN2P3-CNRS, FR-13288 Marseille Cedex 09, France 4 Institute for Fundamental Theory, Dept. of Physics, Univ. of Florida, Gainesville FL 32611, USA 5 IPNL, Université(More)