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Much of the cosmological utility thus far extracted from Type Ia supernovae(SNe Ia) relies on the assumption that SN~Ia peak luminosities do not evolvesignificantly with the age (local or global) of their stellar environments. Tworecent studies have provided conflicting results in evaluating the validity ofthis assumption, with one finding no correlation between Hubble residuals (HR)and stellar environment age, while the other claims a significant correlation.In this Letter we perform an independent reanalysis that rectifies issues withthe statistical methods employed by both of the aforementioned studies. Ouranalysis follows a principled approach that properly accounts for regressiondilution and critically (and unlike both prior studies) utilises theBayesian-model-produced SN environment age estimates (posterior samples)instead of point estimates. Moreover, the posterior is used as an informativeprior in the regression. We find the Pearson correlation between the HR andlocal (global) age to be in excess of $4\sigma$ ($3\sigma$). Assuming thereexists a linear relationship between HR and local (global) age, we find acorresponding slope of $-0.035 \pm 0.007\,\mathrm{mag\,Gyr}^{-1}$ ($-0.036 \pm0.007\,\mathrm{mag\,Gyr}^{-1}$). We encourage further usage of our approach toexamine possible cosmological implications of the HR and age correlation.

Improving Bayesian posterior correlation analysis on Type Ia supernova luminosity evolution