期刊
ASTRONOMY & ASTROPHYSICS
卷 464, 期 3, 页码 827-U23出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20066553
关键词
cosmology : observations; stars : supernovae : general; cosmology : distance scale
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 chi(2) 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 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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