Discovery of SN 2025wny: A Strongly Gravitationally Lensed Superluminous Supernova at z = 2.01

Johansson, J, Perley, DA ORCID: 0000-0001-8472-1996, Goobar, A, Wise, JL ORCID: 0000-0003-0733-2916, Qin, YJ, McGrath, Z, Schulze, S, Lemon, C, Gangopadhyay, A, Tsalapatas, K, Andreoni, I, Bellm, EC, Bloom, JS, Dekany, R, Dhawan, S, Fransson, C, Fremling, C, Graham, MJ, Groom, SL, Gruen, D et al (2025) Discovery of SN 2025wny: A Strongly Gravitationally Lensed Superluminous Supernova at z = 2.01. Astrophysical Journal Letters, 995 (1). ISSN 2041-8205

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	5101 Astronomical Sciences; 51 Physical Sciences; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics; 5101 Astronomical sciences; 5109 Space sciences
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	IOP Publishing
Date of acceptance:	7 November 2025
Date of first compliant Open Access:	22 April 2026
Date Deposited:	22 Apr 2026 13:30
Last Modified:	22 Apr 2026 13:30
DOI or ID number:	10.3847/2041-8213/ae1d61
URI:	https://researchonline.ljmu.ac.uk/id/eprint/28431

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