Testing Lens Models of PLCK G165.7+67.0 Using Lensed SN H0pe
arXiv:2510.07637 · doi:10.3847/1538-4357/ae5f65
Abstract
Supernova H0pe is a multiply-imaged Type Ia supernova (SN~Ia) and the second lensed SN to yield a measurement of the Hubble constant by the time-delay cosmography method, finding (Pascale et. al 2025). We investigate the seven lens modeling approaches used to derive , assessing their agreement with constraints from SN~Ia surveys through a purely observational comparison. \textbf{We test each lens model by combining its predicted magnifications with the observed time delays to reconstruct the intrinsic SN~Ia luminosity and corresponding distance modulus.} While photometrically derived magnifications yield distance moduli in line with expectations, our comparison reveals that lens model predictions, even the most precise ones, \textbf{consistently overestimate the magnification, with an offset ~mag}. This known bias, already appreciated by modeling teams, is independently confirmed through our analysis and highlights the value of lensed SNe as a tool to test model accuracy. If unaccounted for, such magnification biases can propagate into uncertainties in derived cosmological parameters, including , a critical challenge for precision cosmology using strongly lensed transients.
arXiv comment18 pages, 7 figures. Published in ApJ on May 6, 2026
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