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Astronomy and Astrophysics 464 (2007) 827-836
Spectroscopic observations of eight supernovae at intermediate redshift
C. Balland1, 2, 3, M. Mouchet2, 4, R. Amanullah, P. Astier1, S. Fabbro, G. Folatelli, G. Garavini, A. Goobar, D. Hardin1, M. J. Irwin, R. G. McMahon, A. -M. Mourao, S. Nobili, R. Pain1, R. Pascoal, J. Raux1, G. Sainton1, K. Schahmaneche1, N. A. Walton

We present spectra of six Type Ia and two Type II supernovae obtained in June 2002 at the William Herschel Telescope during a search for Type Ia supernovae (SNIa) at intermediate redshift. Supernova type identification and phase determination are performed using a fitting technique based on a Xi2 minimization against a series of model templates. The spectra range from z=0.033 to z=0.328, including one spectroscopically underluminous SNIa at z=0.033. This set of spectra significantly increases the sample of well-observed type SNIa supernovae available in the range 0.15< z <0.35. Together with the twelve supernovae observed by our team in 1999 in the same redshift range, they form an homogeneous sample of seventeen type Ia supernovae with comparable signal-to-noise ratio and regular phase sampling in a still largely unexplored region of the redshift space.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
2 :  APC - UMR 7164 - AstroParticule et Cosmologie
3 :  IAS - Institut d'astrophysique spatiale
4 :  LUTH - Laboratoire Univers et Théories
APC - Cosmologie et gravitation
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

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

Planète et Univers/Astrophysique
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