Testing Lens Models of PLCK G165.7+67.0 Using Lensed SN H0pe
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2025
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| author | Agrawal, Aadya Pierel, J. D. R. Narayan, Gautham Frye, B. L. Diego, Jose M. Garuda, Nikhil Grayling, Matthew Koekemoer, Anton M. Mandel, Kaisey S. Pascale, M. Vizgan, David Windhorst, Rogier A. |
| author_facet | Agrawal, Aadya Pierel, J. D. R. Narayan, Gautham Frye, B. L. Diego, Jose M. Garuda, Nikhil Grayling, Matthew Koekemoer, Anton M. Mandel, Kaisey S. Pascale, M. Vizgan, David Windhorst, Rogier A. |
| contents | 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 $H_0 = 75.4^{+8.1}_{-5.5} \text{km s}^{-1} \text{Mpc}^{-1}$ (Pascale et. al 2025). We investigate the seven lens modeling approaches used to derive $H_0$, assessing their agreement with $Λ\text{CDM}$ 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 $Λ\text{CDM}$ expectations, our comparison reveals that lens model predictions, even the most precise ones, \textbf{consistently overestimate the magnification, with an offset $> 1$~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 $H_0$, a critical challenge for precision cosmology using strongly lensed transients. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_07637 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Testing Lens Models of PLCK G165.7+67.0 Using Lensed SN H0pe Agrawal, Aadya Pierel, J. D. R. Narayan, Gautham Frye, B. L. Diego, Jose M. Garuda, Nikhil Grayling, Matthew Koekemoer, Anton M. Mandel, Kaisey S. Pascale, M. Vizgan, David Windhorst, Rogier A. Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies 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 $H_0 = 75.4^{+8.1}_{-5.5} \text{km s}^{-1} \text{Mpc}^{-1}$ (Pascale et. al 2025). We investigate the seven lens modeling approaches used to derive $H_0$, assessing their agreement with $Λ\text{CDM}$ 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 $Λ\text{CDM}$ expectations, our comparison reveals that lens model predictions, even the most precise ones, \textbf{consistently overestimate the magnification, with an offset $> 1$~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 $H_0$, a critical challenge for precision cosmology using strongly lensed transients. |
| title | Testing Lens Models of PLCK G165.7+67.0 Using Lensed SN H0pe |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2510.07637 |