A new $H_0$ measurement with SNe Requiem and Encore using $\texttt{Gravity.jl}$

L. Bazzanini; G. Di Rosa; A. Acebron; P. Bergamini; M. Lombardi; P. Rosati; G. Angora; G. B. Caminha; S. Ertl; G. Granata; A. M. Koekemoer; S. H. Suyu; J. Pierel; A. B. Newman; C. Grillo; S. Schuldt; M. Bulla; S. Cha; M. D'Addona; J. M. Diego; M. Fogliardi; B. L. Frye; M. J. Jee; P. S. Kamieneski; M. Meneghetti; A. Mercurio; E. Vanzella

arXiv · 2606.25205

A new $H_0$ measurement with SNe Requiem and Encore using $\texttt{Gravity.jl}$

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Abstract

We present a strong-lensing (SL) analysis of the galaxy cluster MACS J0138.0-2155 (z=0.336), the first known lens cluster discovered to host two distinct multiply imaged Type Ia supernovae (SNe): SN Requiem and SN Encore. Both SNe are located in the massive, multiply imaged red galaxy MRG-M0138 at z=1.949. The projected total mass of this cluster has been investigated with several independent lens models (Suyu+26; Pierel+26), using a sample of 23 spectroscopically confirmed multiple images from 8 background sources (0.767 10%). The forthcoming reappearance of SN Requiem offers an immediate opportunity to significantly improve constraints on H0, provided that lens-model systematics are controlled. These results establish M0138 as a premier anchor for high-precision cluster-scale TDC.

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L. Bazzanini, G. Di Rosa, A. Acebron, P. Bergamini, M. Lombardi, P. Rosati, G. Angora, G. B. Caminha, S. Ertl, G. Granata, A. M. Koekemoer, S. H. Suyu, J. Pierel, A. B. Newman, C. Grillo, S. Schuldt, M. Bulla, S. Cha, M. D'Addona, J. M. Diego, M. Fogliardi, B. L. Frye, M. J. Jee, P. S. Kamieneski, M. Meneghetti, A. Mercurio, E. Vanzella. 2026-06-23. A new $H_0$ measurement with SNe Requiem and Encore using $\texttt{Gravity.jl}$. https://arxiv.org/abs/2606.25205

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