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We aim to improve upon contemporary methods to estimate host-galaxy reddeningof stripped-envelope (SE) supernovae (SNe). To this end the Carnegie SupernovaProject (CSP-I) SE SNe photometry data release, consisting of nearly threedozen objects, is used to identify a minimally reddened sub-sample for eachtraditionally defined spectroscopic sub-types (i.e, SNe~IIb, SNe~Ib, SNe~Ic).Inspection of the optical and near-infrared (NIR) colors and color evolution ofthe minimally reddened sub-samples reveals a high degree of homogeneity,particularly between 0d to +20d relative to B-band maximum. This motivated theconstruction of intrinsic color-curve templates, which when compared to thecolors of reddened SE SNe, yields an entire suite of optical and NIR colorexcess measurements. Comparison of optical/optical vs. optical/NIR color excessmeasurements indicates the majority of the CSP-I SE SNe suffer relatively lowamounts of reddening and we find evidence for different R_(V)^(host) valuesamong different SE SN. Fitting the color excess measurements of the seven mostreddened objects with the Fitzpatrick (1999) reddening law model providesrobust estimates of the host visual-extinction A_(V)^(host) and R_(V)^(host).In the case of the SE SNe with relatively low amounts of reddening, a preferredvalue of R_(V)^(host) is adopted for each sub-type, resulting in estimates ofA_(V)^(host) through Fitzpatrick (1999) reddening law model fits to theobserved color excess measurements. Our analysis suggests SE SNe reside ingalaxies characterized by a range of dust properties. We also find evidence SNeIc are more likely to occur in regions characterized by larger R_(V)^(host)values compared to SNe IIb/Ib and they also tend to suffer more extinction.These findings are consistent with work in the literature suggesting SNe Ictend to occur in regions of on-going star formation.

The Carnegie Supernova Project I: methods to estimate host-galaxy reddening of stripped-envelope supernovae