Spectroscopy of the type Ia supernova SN 2002er: Days-11 to+215

Rubina Kotak, W.P.S. Meikle, G. Pignata, M. Stehle, Stephen Smartt, S. Benetti, W. Hillebrandt, D.J. Lennon, P.A. Mazzali, F. Patat, M. Turatto

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48 Citations (Scopus)

Abstract

We present an extensive set of optical spectroscopy of the nearby type Ia supernova, SN 2002er, with 24 epochs spanning -11 to +34 days. Its spectral evolution is fairly typical of a type Ia supernova although it suffers high extinction. Nevertheless, there are differences in the spectral evolution when compared to coeval spectra of other normal type Ia supernova with comparable decline-rate parameters. Modelling of the photospheric phase spectra using a homogeneous abundance distribution in the atmosphere provides a fair match to the observations, but only by pushing the adopted distance and risetime close to the observational limits. Future improvements here will require models with a more realistic stratified abundance distribution. From simple modelling of a nebular spectrum obtained at +215 d, we infer a Ni-56 mass of 0.69 M-circle dot, consistent with that derived from the light curve.
Original languageEnglish
Pages (from-to)1021-1031
Number of pages11
JournalAstronomy and Astrophysics
Volume436
Issue number3
DOIs
Publication statusPublished - Jun 2005

ASJC Scopus subject areas

  • Space and Planetary Science

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