Journal
ASTRONOMY & ASTROPHYSICS
Volume 436, Issue 3, Pages 1021-1031Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20052756
Keywords
stars : supernovae : general; stars : supernovae : individual : SN 2002er; methods : observational; techniques : spectroscopic
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Funding
- Science and Technology Facilities Council [PP/C506805/1] Funding Source: researchfish
- STFC [PP/C506805/1] Funding Source: UKRI
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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.
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