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Date and Time of the Query: 2019-03-25 T11:53:31 PDT
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For refcode 2014ApJ...789...32B:
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2014ApJ...789...32B The Carnegie Supernova Project: Intrinsic Colors of Type Ia Supernovae Burns, Christopher R.; Stritzinger, Maximilian; Phillips, M. M.; Hsiao, E. Y.; Contreras, Carlos; Persson, S. E.; Folatelli, Gaston; Boldt, Luis; Campillay, Abdo; Castellon, Sergio; Freedman, Wendy L.; Madore, Barry F.; Morrell, Nidia; Salgado, Francisco; Suntzeff, Nicholas B. Abstract. We present an updated analysis of the intrinsic colors of Type Ia supernova (SNe Ia) using the latest data release of the Carnegie Supernova Project. We introduce a new light-curve parameter very similar to stretch that is better suited for fast-declining events, and find that these peculiar types can be seen as extensions to the population of "normal" SNe Ia. With a larger number of objects, an updated fit to the Lira relation is presented along with evidence for a dependence on the late-time slope of the B - V light-curves with stretch and color. Using the full wavelength range from u to H band, we place constraints on the reddening law for the sample as a whole and also for individual events/hosts based solely on the observed colors. The photometric data continue to favor low values of R_V_, though with large variations from event to event, indicating an intrinsic distribution. We confirm the findings of other groups that there appears to be a correlation between the derived reddening law, R_V_, and the color excess, E(B - V), such that larger E(B - V) tends to favor lower R_V_ . The intrinsic u-band colors show a relatively large scatter that cannot be explained by variations in R_V_ or by the Goobar power-law for circumstellar dust, but rather is correlated with spectroscopic features of the supernova and is therefore likely due to metallicity effects. Key words: distance scale, dust, extinction, galaxies: ISM, methods: statistical, supernovae: general
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