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

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A. Pastorello G. Pignata R. Kotak A. Harutyunyan G. Altavilla H. Navasardyan Y. Qiu M. E. Salvo W. Hillebrandt

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classification 🌌 astro-ph

keywords typedeltaextinctionnormalsmallvalueallowinganomalous

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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 days 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. (1989) extinction law, simultaneous matches to a range of colour curves of normal SNe Ia yielded E(B-V) = 1.33+/-0.11, and R_v = 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 ISM.

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Anomalous extinction behaviour towards the Type Ia SN 2003cg

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