Open AccessAnomalous extinction behaviour towards the Type Ia SN 2003cg
Author(s) -
EliasRosa N.,
Benetti S.,
Cappellaro E.,
Turatto M.,
Mazzali P. A.,
Patat F.,
Meikle W. P. S.,
Stehle M.,
Pastorello A.,
Pignata G.,
Kotak R.,
Harutyunyan A.,
Altavilla G.,
Navasardyan H.,
Qiu Y.,
Salvo M.,
Hillebrandt W.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10430.x
Subject(s) - physics , photometry (optics) , astrophysics , extinction (optical mineralogy) , interstellar medium , galaxy , spectroscopy , cosmic dust , infrared , astronomy , stars , optics
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 Δ m 15 ( B ) obs = 1.12 ± 0.04 [Δ 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 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 interstellar medium.