2012MNRAS.422.1178I

We compare and analyse a time series of spectral observations obtained during the first 30 d of evolution of SN 2007od with the non-local thermodynamic equilibrium code PHOENIX. Despite some spectroscopic particularities in the Balmer features, this supernova appears to be a normal Type II, and the fits proposed are generally in good agreement with the observations. As a starting point, we have carried out an analysis with the parametrized synthetic spectrum code SYNOW to confirm line identifications and to highlight differences between the results of the two codes. The analysis computed using PHOENIX suggests the presence of a high-velocity feature in Hβ and an Hα profile reproduced with a density profile steeper than that of the other elements. We also show a detailed analysis of the ions velocities of the six synthetic spectra. The distance is estimated for each epoch with the spectral-fitting expanding atmosphere method. Consistent results are found using all the spectra which give the explosion date of JD 245 4403 (2007 October 29) and a distance modulus µ= 32.2±0.3.