An imaging polarimetry survey of Type Ia supernovae: are peculiar extinction and polarization properties produced by circumstellar or interstellar matter?

Matthew R. Chu, Aleksandar Cikota, Dietrich Baade +8

Some highly reddened Type Ia supernovae (SNe Ia) display low total-to-selective extinction ratios ($R_V\lesssim 2$) in comparison to that of typical Milky Way dust ($R_V \approx 3…