Image Details
Caption: Figure 2.
Left panel: compilation of ground-based (circles) and JWST (square symbols) photometric observations of SN 2025mkn (Image A). The solid lines show the lightcurves of SN 2023ixf in matching rest-frame filters or synthetic photometry on spectra indicated in the legend. The star symbols and dashed lines show the photometry for image B (shifted both in time and magnitude, corresponding to a fiducial time delay and differential magnification). The observation dates of the spectra are marked along the top with "S" symbols. Right panel: optical and near-IR spectra (black lines) of SN 2025mkn (Image A). The shaded red lines show SN 2023ixf redshifted and scaled to match SN 2025mkn with magnifications of 250 and 15 (for A and B respectively) at similar phases (reported in rest-frame days). The blue line is a combined Keck/LRIS and JWST/NIRSpec spectrum of the lens galaxy.
© 2026. The Author(s). Published by the American Astronomical Society.