SN 2025ogs is a spectroscopically normal Type Ia supernova at z=2.05 whose luminosity distance and properties are consistent with low-z standards and current LambdaCDM constraints.
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A two-population Bayesian model of Type Ia supernovae and hosts fitted to ZTF DR2 data yields a luminosity gap, different stretch slopes, and host-dependent extinctions while rendering separate host-galaxy step corrections redundant.
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SN 2025ogs: A Spectroscopically-Normal Type Ia Supernova at z = 2 as a Benchmark for Redshift Evolution
SN 2025ogs is a spectroscopically normal Type Ia supernova at z=2.05 whose luminosity distance and properties are consistent with low-z standards and current LambdaCDM constraints.
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Two-population model of type Ia supernovae and their associations with host galaxies in ZTF DR2
A two-population Bayesian model of Type Ia supernovae and hosts fitted to ZTF DR2 data yields a luminosity gap, different stretch slopes, and host-dependent extinctions while rendering separate host-galaxy step corrections redundant.