HOLISMOKES XX. Lens models of binary lens galaxies with five images of Supernova Winny
L. R. Ecker, A. G. Schweinfurth, R. Saglia, L. Deng, S. H. Suyu, C. Saulder, J. Snigula, R. Bender, R. Ca\~nameras, T.-W. Chen, A. Galan, A. Halkola, E. Mamuzic, A. Melo, S. Schuldt, and S. Taubenberger

TL;DR
This paper presents high-resolution imaging and detailed lens modeling of the strongly lensed supernova SN Winny, revealing five images and constraining the mass distribution of the lens galaxies G1 and G2.
Contribution
It provides the first mass models of SN Winny's lens system using lenstronomy and GLEE, including the detection of a fifth supernova image and detailed mass measurements.
Findings
Confirmed the fifth supernova image with consistent color.
Measured the masses of the lens galaxies G1 and G2.
Predicted magnifications vary from 1.6 to 10, with some discrepancies in relative magnifications.
Abstract
Strongly lensed supernovae (SNe) provide a powerful way to study cosmology, SNe and galaxies. Modelling the lens system is key to extracting astrophysical and cosmological information. We present adaptive-optics-assisted high-resolution images of SN Winny (SN 2025wny) in the J and K filters obtained with the Large Binocular Telescope (LBT). The LBT imaging confirms the presence of a fifth point source, whose colour is consistent with that of the other SN images at similar phases, while lens modelling robustly supports its interpretation as an additional image of SN~Winny. We measure the positions of the five SN images with uncertainties varying between 1 and 14 milliarcseconds. We build the first mass models using lenstronomy and GLEE, and explore three classes of mass models for the two lens galaxies G1 and G2. The optimal model class of the three is a singular isothermal ellipsoid for…
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Taxonomy
TopicsGamma-ray bursts and supernovae · Astronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena
