Cosmology with Supernova Encore in the Strong Lensing Cluster MACS J0138–2155: Time Delays and Hubble Constant Measurement

Pierel, J. D. R.; Hayes, E. E.; Millon, M.; Larison, C.; Mamuzic, E.; Acebron, A.; Agrawal, A.; Bergamini, P.; Cha, S.; Dhawan, S.; Diego, J. M.; Frye, B. L.; Gilman, D.; Granata, G.; Grillo, C.; Jee, M. J.; Kamieneski, P. S.; Koekemoer, A. M.; Meena, A. K.; Newman, A. B.; Oguri, M.; Padilla-Gonzalez, E.; Poidevin, F.; Rosati, P.; Schuldt, S.; Strolger, L. G.; Suyu, S. H.; Thorp, S.; Zitrin, A.

doi:10.3847/1538-4357/ae3159

articleThe Astrophysical JournalFeb 11, 2026GOLD OA

Cosmology with Supernova Encore in the Strong Lensing Cluster MACS J0138–2155: Time Delays and Hubble Constant Measurement

JDJ. D. R. Pierel EEE. E. Hayes MMM. Millon CLC. Larison EME. Mamuzic

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Abstract

Abstract Multiply imaged supernovae (SNe) provide a novel means of constraining the Hubble constant ( H 0 ). Such measurements require a combination of precise models of the lensing mass distribution and an accurate estimate of the relative time delays between arrival of the multiple images. Only two multiply imaged SNe, Refsdal and H0pe, have enabled measurements of H 0 thus far. Here we detail the third such measurement for SN Encore, a z = 1.95 Type Ia SN discovered in JWST/NIRCam imaging. We measure the time delay, perform simulations of additional microlensing and millilensing systematics, and combine with the mass models of Suyu et al. in a double-blind analysis to obtain our H 0 constraint. Our final…

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Topics & keywords

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Keywords

Gravitational microlensing
Hubble's law
Supernova
Cosmology
Mass distribution
Measure (data warehouse)

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