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Improving SN Ia Standardization with Host Galaxy Mass and Local Stellar Age

Presentation #409.08 in the session “Supernovae 2”.

Published onJan 11, 2021
Improving SN Ia Standardization with Host Galaxy Mass and Local Stellar Age

Over the last decade Type Ia Supernovae (SNe Ia) are standardized using both light-curve and host galaxy properties. We perform a simultaneous fit of both light-curve and host galaxy standardization coefficients. We find a correlation between the light-curve shape and stellar mass corrections, indicating that searches for correlations between Hubble-Lemaître residuals and host galaxy properties are biased. We find results consistent with a change in the color standardization term as a function of host stellar mass. Of all the tested models, the combination of host stellar mass and local age (seen at >3σ) increases the precision of SNe Ia distances by 10%. This is not seen when standardizing with global age. This combination is consistent with either metallicity or line-of-sight dust affecting the observed luminosity of SNe Ia.


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