Spectral properties of type Ia supernovae up to<i>z</i> ~ 0.3
Spectral properties of type Ia supernovae up to<i>z</i> ~ 0.3
Aims: Spectroscopic observations of Type Ia supernovae obtained at the New Technology Telescope (NTT) and the Nordic Optical Telescope (NOT), in conjunction with the SDSS-II Supernova Survey, are analysed. We use spectral indicators measured up to a month after the lightcurve peak luminosity to characterise the supernova properties, and examine …