Extended Data Fig. 5: Marginalized and joint posterior distributions for the color curve age constraints measured in this analysis.
From: A gravitationally lensed supernova with an observable two-decade time delay
Two-dimensional plots show MCMC sampling points as discrete dots, with contours for the high density regions, drawn at 0.5, 1, 1.5 and 2σ levels. Marginalized (1D) distributions are shown at the top of each column, with dashed vertical lines at the mean and ± 1σ (marking 16%, 50% and 84% levels). We use a weak prior on the SALT2 color parameter (c), and set the SALT2 stretch parameter (x1) to 0. This method is fully independent of lens modeling. The table in the upper right lists all priors, observations, and lens model information used for SN age estimates in this work. Only the highlighted components were used for the constraints shown here.
