Extended Data Fig. 7: Galactic extinction-corrected B-V, g-r, and g-i color curves of SN 2018evt.

All colors were binned for 20 days to increase the signal-to-noise ratio. The colors predicted by the scattering of the newly-formed dust in the post-shock CDS are also presented by gray symbols as labeled. The calculation was carried out by assuming that the intrinsic colors of SN 2018evt are identical to the values at day ~ +310, as indicated by the horizontal black line segments. The results of the 0.05 μm graphite are shown by gray circles and linearly fitted by gray-dashed lines. The predicted colors of the 0.05 μm silicate dust are presented by gray squares and linearly fitted by gray-dotted lines. The error bars shown represent 1 - σ uncertainties of colors.