Anomalous extinction behaviour towards the type Ia SN 2003cg

N. Elias-Rosa, S. Benetti, E. Cappellaro, M. Turatto, P.A. Mazzali, F. Patat, W.P.S. Meikle, M. Stehle, Andrea Pastorello, G. Pignata, Rubina Kotak, A. Harutyunyan, G. Altavilla, H. Navasardyan, Y. Qiu, M. Salvo, W. Hillebrandt

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110 Citations (Scopus)


We present optical and near-infrared photometry and spectroscopy of the Type Ia SN 2003cg, which exploded in the nearby galaxy NGC 3169. The observations cover a period between -8.5 and +414 d post-maximum. SN 2003cg is a normal but highly reddened Type Ia event. Its B magnitude at maximum B-max = 15.94 +/- 0.04 and Delta m(15)(B)(obs) = 1.12 +/- 0.04 [Delta m(15)(B)(intrinsic) = 1.25 +/- 0.05]. Allowing R-V to become a free parameter within the Cardelli et al. extinction law, simultaneous matches to a range of colour curves of normal SNe Ia yielded E(B - V) = 1.33 +/- 0.11, and RV = 1.80 +/- 0.19. While the value obtained for R-V is small, such values have been invoked in the past, and may imply a grain size which is small compared with the average value for the local interstellar medium.
Original languageEnglish
Pages (from-to)1880-1900
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Publication statusPublished - Jul 2006

ASJC Scopus subject areas

  • Space and Planetary Science

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