A&A 464, 827-836 (2007)
DOI: 10.1051/0004-6361:20066553

Spectroscopic observations of eight supernovae at intermediate redshift

C. Balland^{1, 2, 3}, M. Mouchet^{3, 4}, R. Amanullah⁵, P. Astier¹, S. Fabbro⁶, G. Folatelli⁵, G. Garavini⁵, A. Goobar⁵, D. Hardin¹, M. J. Irwin⁷, R. G. McMahon⁷, A.-M. Mourão⁶, S. Nobili⁵, R. Pain¹, R. Pascoal⁶, J. Raux¹, G. Sainton¹, K. Schahmaneche¹, and N. A. Walton<sup>7

1</sup>  LPNHE, CNRS-IN2P3 and Universities of Paris 6 & 7, 75252 Paris Cedex 05, France
²  Univ. Paris-Sud, 91405 Orsay, France
    e-mail: christophe.balland@ias.u-psud.fr
³  APC, UMR 7164 CNRS, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
⁴  LUTH, UMR 8102 CNRS, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France
⁵  Department of Physics, Stockholm University, 10691 Stockholm, Sweden
⁶  CENTRA-Centro M. de Astrofisica and Department of Physics, IST, Lisbon, Portugal
⁷  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK

(Received 12 October 2006 / Accepted 4 December 2006 )

Abstract
Aims.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 (SN Ia) at intermediate redshift.
Methods.Supernova type identification and phase determination are performed using a fitting technique based on a minimization against a series of model templates.
Results. The spectra range from z=0.033 to z=0.328, including one spectroscopically underluminous SN Ia at z=0.033. This set of spectra significantly increases the sample of well-observed type SN Ia  supernovae available in the range . 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.

Key words: cosmology: observations -- stars: supernovae: general -- cosmology: distance scale

© ESO 2007

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