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Main Authors: Johansson, Joel, Perley, Daniel A., Goobar, Ariel, Wise, Jacob L., Qin, Yu-Jing, McGrath, Zoë, Schulze, Steve, Lemon, Cameron, Gangopadhyay, Anjasha, Tsalapatas, Konstantinos, Andreoni, Igor, Bellm, Eric C., Bloom, Joshua S., Dekany, Richard, Dhawan, Suhail, Fremling, Christoffer, Graham, Matthew J., Groom, Steven L., Gruen, Daniel, Hall, Xander J., Kasliwal, Mansi, Laher, Russ R., Lunnan, Ragnhild, Mahabal, Ashish A., Miller, Adam A., Mörtsell, Edvard, Nordin, Jakob, Hjortlund, Jacob Osman, Rich, R. Michael, Riddle, Reed L., Singh, Avinash, Sollerman, Jesper, Townsend, Alice, Yan, Lin
Format: Preprint
Published: 2025
Subjects:
Cosmology and Nongalactic Astrophysics
Online Access:https://arxiv.org/abs/2510.23533
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Table of Contents:
  • We present the discovery of SN 2025wny (ZTF25abnjznp/GOTO25gtq) and spectroscopic classification of this event as the first gravitationally lensed Type I superluminous supernovae (SLSN-I). Deep ground-based follow-up observations resolves 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 point image shows narrow features matching absorption lines at a redshift of z = 2.011 and broad features matching those seen in superluminous SNe with Far-UV coverage. We infer a magnification factor of 20 to 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 what has been previously assumed, and provide a unique window into studying distant supernovae, internal properties of dwarf galaxies, as well as for time-delay cosmography.

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