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THE CARNEGIE SUPERNOVA PROJECT: INTRINSIC COLORS OF TYPE Ia SUPERNOVAE

Chris R. BurnsObservatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USAM. StritzingerDepartment of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, DenmarkM. M. PhillipsCarnegie Institution of Washington, Las Campanas Observatory, Colina El Pino, Casilla 601, ChileE. Y. HsiaoCarnegie Institution of Washington, Las Campanas Observatory, Colina El Pino, Casilla 601, ChileC. ContrerasCarnegie Institution of Washington, Las Campanas Observatory, Colina El Pino, Casilla 601, ChileS. E. PerssonObservatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USAG. FolatelliKavli Institute for the Physics and Mathematics of the Universe, Todai Institutes for Advanced Study, the University of Tokyo, 277-8583 Kashiwa, JapanLuis BoldtCarnegie Institution of Washington, Las Campanas Observatory, Colina El Pino, Casilla 601, ChileA. CampillayCarnegie Institution of Washington, Las Campanas Observatory, Colina El Pino, Casilla 601, ChileS. CastellónCarnegie Institution of Washington, Las Campanas Observatory, Colina El Pino, Casilla 601, ChileWendy L. FreedmanObservatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USABarry F. MadoreObservatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USAN. MorrellCarnegie Institution of Washington, Las Campanas Observatory, Colina El Pino, Casilla 601, ChileF. SalgadoCarnegie Institution of Washington, Las Campanas Observatory, Colina El Pino, Casilla 601, ChileN. B. SuntzeffGeorge P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, Department of Physics and Astronomy, College Station, TX 77843, USA

2019en

ABI

Annotatsiya

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 RV, 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, RV, and the color excess, E(B − V), such that larger E(B − V) tends to favor lower RV. The intrinsic u-band colors show a relatively large scatter that cannot be explained by variations in RV 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.

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