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Date and Time of the Query: 2019-05-25 T08:05:49 PDT
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For refcode 2008A&A...487...19N:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2008A&A...487...19N The colour-lightcurve shape relation of type Ia supernovae and the reddening law Nobili, S.; Goobar, A. Abstract. Aims. We present a study of the time sequence of optical colours of a large sample of nearby type Ia supernovae (SNe Ia). We study the dependence of the colour time-evolution on the lightcurve shape, parametrized by the stretch factor. Methods: We determine the spectral template that minimizes the dispersion in the colours of SNe Ia, measured by UBVRI photometry of nearby supernovae. Results: A clear colour dependence upon lightcurve shape is found, such that the narrower lightcurves are redder up to about one month past lightcurve maximum. After correcting for lightcurve-shape differences in intrinsic colour, we derive an average reddening law, that is well described by a Cardelli, Clayton & Mathis law with R_V_ = 1.75 +/- 0.27 for 80 type Ia supernovae with E(B-V) <= 0.7 mag. A subset of 69 SNe that have modest reddening, E(B-V) < 0.25 mag, gives a significantly smaller value, R_V_ ~ 1, which suggests that the observed reddening of type Ia supernovae may have a more complex origin, perhaps associated with other processes besides extinction by interstellar dust inside the host galaxy. Key words: stars: supernovae: general, ISM: dust, extinction, methods: statistical
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