December
2025
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2025ApJ...995L..17J
Authors
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Johansson, Joel
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Perley, Daniel A.
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Goobar, Ariel
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Wise, Jacob L.
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Qin, Yu-Jing
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McGrath, Zoë
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Schulze, Steve
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Lemon, Cameron
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Gangopadhyay, Anjasha
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Tsalapatas, Konstantinos
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Andreoni, Igor
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Bellm, Eric C.
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Bloom, Joshua S.
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Dekany, Richard
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Dhawan, Suhail
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Fransson, Claes
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Fremling, Christoffer
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Graham, Matthew J.
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Groom, Steven L.
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Gruen, Daniel
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Hall, Xander J.
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Helou, George
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Kasliwal, Mansi
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Laher, Russ R.
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Lunnan, Ragnhild
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Mahabal, Ashish A.
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Miller, Adam A.
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Mörtsell, Edvard
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Nordin, Jakob
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Hjortlund, Jacob Osman
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Rich, R. Michael
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Riddle, Reed L.
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Singh, Avinash
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Sollerman, Jesper
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Townsend, Alice
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Yan, Lin
Abstract
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We present the discovery of SN 2025wny (ZTF25abnjznp/GOTO25gqt) and spectroscopic classification of this event as the first gravitationally lensed Type I superluminous supernova (SLSN-I). Deep ground-based follow-up observations resolve four images of the supernova with ∼1.″7 angular separation from the main lens galaxy, each coincident with the lensed images of a background galaxy seen in archival imaging of the field. Spectroscopy of the brightest image shows narrow features matching absorption lines at a redshift of z = 2.010 and broad features matching those seen in superluminous SNe with far-UV coverage. We infer a magnification factor of μ ∼ 20─50 for the brightest image in the system, based on photometric and spectroscopic comparisons to other SLSNe-I. SN 2025wny demonstrates that gravitationally lensed SNe are in reach of ground-based facilities out to redshifts far higher than previously assumed, and provide a unique window into studying distant supernovae and the internal properties of dwarf galaxies, as well as for time-delay cosmography.
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