The Carnegie Supernova Project: Intrinsic Colors of Type Ia Supernovae
Christopher R. Burns, Maximilian Stritzinger, M. M. Phillips, E. Y., Hsiao, Carlos Contreras, S. E. Persson, Gaston Folatelli, Luis Boldt, Abdo, Campillay, Sergio Catell\'on, Wendy L. Freedman, Barry F. Madore, Nidia, Morrell, Francisco Salgado, Nicholas B. Suntzeff

TL;DR
This study refines the understanding of intrinsic colors of Type Ia Supernovae using extensive data, introduces a new light-curve parameter, and investigates the reddening law and metallicity effects across various wavelengths.
Contribution
It introduces a new light-curve parameter suited for fast-declining SNe Ia and provides an updated analysis of intrinsic colors and reddening laws with a larger dataset.
Findings
Peculiar SNe Ia are extensions of normal populations.
Low Rv values are favored but vary significantly.
Large scatter in u-band colors linked to metallicity.
Abstract
We present an updated analysis of the intrinsic colors of 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 color-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 Rv, though with large variations from event to event, indicating an intrinsic distribution. We confirm the findings of…
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