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A Linear Relation between the Color Stretch s <sub> BV </sub> and the Rising Color Slope s0*(B−V) of Type Ia Supernovae
Using data from the Complete Nearby ($z_{host}<0.02$) sample of Type Ia Supernovae (CNIa0.02), we discover a linear relation between two parameters derived from the $B-V$ color curves of Type Ia supernovae: the "color stretch" $s_{BV}$ and the rising color slope $s_0^*(B-V)$ after the peak, and this relation applies to the …