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Spectroscopic observations of eight supernovae at intermediate redshift

Abstract : 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.
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Contributor : Simone Lantz <>
Submitted on : Monday, June 11, 2007 - 3:57:00 PM
Last modification on : Monday, January 4, 2021 - 2:44:02 PM

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C. Balland, M. Mouchet, R. Amanullah, P. Astier, S. Fabbro, et al.. Spectroscopic observations of eight supernovae at intermediate redshift. Astronomy and Astrophysics - A&A, EDP Sciences, 2007, 464, pp.827-836. ⟨10.1051/0004-6361:20066553⟩. ⟨in2p3-00139454⟩



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