S
Stéphane Basa
Researcher at Centre national de la recherche scientifique
Publications - 118
Citations - 6719
Stéphane Basa is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Supernova & Supernova Legacy Survey. The author has an hindex of 36, co-authored 102 publications receiving 6240 citations.
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Journal ArticleDOI
Supernova constraints and systematic uncertainties from the first three years of the supernova legacy survey
Alex Conley,Alex Conley,Julien Guy,Mark Sullivan,Nicolas Regnault,Pierre Astier,Christophe Balland,Christophe Balland,Stéphane Basa,Raymond G. Carlberg,Dominique Fouchez,D. Hardin,I. M. Hook,I. M. Hook,D. A. Howell,D. A. Howell,Reynald Pain,Nathalie Palanque-Delabrouille,Kathy Perrett,Kathy Perrett,C. J. Pritchet,Jeffrey A. Rich,V. Ruhlmann-Kleider,David D. Balam,S. Baumont,Richard S. Ellis,Richard S. Ellis,Sebastien Fabbro,Sebastien Fabbro,H. K. Fakhouri,N. Fourmanoit,Santiago González-Gaitán,Melissa L. Graham,Michael J. Hudson,Eric Hsiao,T. Kronborg,C. Lidman,A. Mourao,James D. Neill,Saul Perlmutter,Saul Perlmutter,P. Ripoche,P. Ripoche,Nao Suzuki,E. S. Walker +44 more
TL;DR: In this article, the authors combine high redshift Type Ia supernovae from the first 3 years of the Supernova Legacy Survey (SNLS) with other supernova (SN) samples, primarily at lower redshifts, to form a high-quality joint sample of 472 SNe (123 low-$z, 93 SDSS, 242 SNLS, and 14 {\it Hubble Space Telescope}).
Journal ArticleDOI
The Supernova Legacy Survey 3-year sample: Type Ia supernovae photometric distances and cosmological constraints ,
Julien Guy,Mark Sullivan,Alex Conley,Alex Conley,Nicolas Regnault,Pierre Astier,Christophe Balland,Christophe Balland,Stéphane Basa,Raymond G. Carlberg,Dominique Fouchez,D. Hardin,I. M. Hook,I. M. Hook,D. A. Howell,D. A. Howell,Reynald Pain,Nathalie Palanque-Delabrouille,Kathy Perrett,Kathy Perrett,Christopher J. Pritchet,J. Rich,V. Ruhlmann-Kleider,David D. Balam,S. Baumont,Rowan Ellis,Rowan Ellis,Sebastien Fabbro,Sebastien Fabbro,H. K. Fakhouri,N. Fourmanoit,Santiago González-Gaitán,Melissa L. Graham,Eric Hsiao,T. Kronborg,C. Lidman,A. Mourao,Saul Perlmutter,P. Ripoche,P. Ripoche,Nao Suzuki,Emma S. Walker +41 more
TL;DR: In this paper, photometric properties and distance measurements of 252 high redshift Type Ia supernovae (0.15 < z < 1.1) were presented and their multi-colour light curves measured using the MegaPrime/MegaCam instrument at the Canada-France-Hawaii Telescope (CFHT).
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The type Ia supernova SNLS-03D3bb from a super-Chandrasekhar-mass white dwarf star
D. Andrew Howell,Mark Sullivan,Peter Nugent,Richard S. Ellis,Alex Conley,Damien Le Borgne,Raymond G. Carlberg,Julien Guy,David D. Balam,Stéphane Basa,D. Fouchez,Isobel Hook,Eric Hsiao,James D. Neill,Reynald Pain,K. Perrett,Christopher J. Pritchet +16 more
TL;DR: It is shown that the high-redshift supernova SNLS-03D3bb has an exceptionally high luminosity and low kinetic energy that both imply a super-Chandrasekhar-mass progenitor, which may provide an explanation for the observed trend that overluminous type Ia supernovae occur only in ‘young’ environments.
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SNLS3: Constraints on dark energy combining the supernova legacy survey three-year data with other probes
Mark Sullivan,Julien Guy,Alex Conley,Alex Conley,Nicolas Regnault,Pierre Astier,Christophe Balland,Christophe Balland,Stéphane Basa,Raymond G. Carlberg,Dominique Fouchez,D. Hardin,I. M. Hook,I. M. Hook,D. A. Howell,D. A. Howell,Reynald Pain,N. Palanque-Delabrouille,Kathy Perrett,Kathy Perrett,C. J. Pritchet,Jeffrey A. Rich,V. Ruhlmann-Kleider,David D. Balam,S. Baumont,Richard S. Ellis,Richard S. Ellis,Sebastien Fabbro,H. K. Fakhouri,N. Fourmanoit,Santiago González-Gaitán,Melissa L. Graham,Melissa L. Graham,Michael J. Hudson,Michael J. Hudson,Eric Hsiao,T. Kronborg,C. Lidman,A. Mourao,James D. Neill,Saul Perlmutter,Saul Perlmutter,P. Ripoche,P. Ripoche,Nao Suzuki,E. S. Walker +45 more
TL;DR: In this article, the authors present observational constraints on the nature of dark energy using the Supernova Legacy Survey three-year sample (SNLS3) of Guy et al. and Conley et al., and they find that the cosmological constraints derived from these different subsamples are consistent.
Journal ArticleDOI
UV/Optical Detections of Candidate Tidal Disruption Events by GALEX and CFHTLS*
Suvi Gezari,Stéphane Basa,D. C. Martin,G. Bazin,Karl Forster,Bruno Milliard,Jules P. Halpern,Peter G. Friedman,Patrick Morrissey,Susan G. Neff,David Schiminovich,Mark Seibert,Todd Small,Ted K. Wyder +13 more
TL;DR: In this article, the authors present two luminous UV/optical flares from the nuclei of apparently inactive early-type galaxies at z = 0.37 and 0.33 that have the radiative properties of a flare from the tidal disruption of a star.