Anomalous extinction behaviour towards the Type Ia SN 2003cg
Abstract
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 Bmax = 15.94+/-0.04 and Delta m15(B)obs = 1.12+/-0.04 (Delta m15(B)intrinsic = 1.25+/-0.05). Allowing Rv 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 Rv = 1.80+/-0.19. While the value obtained for Rv 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.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.