Posted in astro-ph.CO · 2026-08-28 · Maggie L. Li, Lin Yan, Anamaria Gkini, Alice Townsend, Yu-Jing Qin, Steve Schulze, Nikhil Sarin, Suhail Dhawan, Joel Johansson, Ariel Goobar, Jacob Osman Hjortlund, Edvard Mörtsell, Jesper Sollerman, Ragnhild Lunnan, Daniel A. Perley, Ehud Nakhar, Avinash Singh, Avishay Gal-Yam, Mansi M. Kasliwal, Conor M. B. Omand, Aleksandra Bochenek, Malte Busmann, Kaustav K. Das, Christoffer Fremling, Alexa C. Gordon, Daniel Gruen, Wynn Jacobson-Galán, K-Ryan Hinds, Chang Liu, Zoë McGrath, Ezequiel J. Marchesini, Christopher Martin, Peter Massey, Martijn S. S. L. Oei, Eliana Palazzi, Francisco Prada, Nikolaus Z. Prusinski, Nabeel Rehemtulla, Andrea Rossi, R. Michael Rich, Sam Rose, Killa Santer, Surya Shivaprasad, Hannah C. Turner, Chiara Ventura, Jacob L. Wise, Michael Coughlin, Argyro Sasli, Niharika Sravan
SN 2025wny is a gravitationally lensed, hydrogen-poor superluminous supernova (SLSN-I) at z = 2.015. To date, it is the most extensively observed high-redshift core-collapse SN and has the most detailed rest-frame UV observations of any SLSN. We present densely sampled rest-frame UV-to-optical photometry and spectroscopy out to +80 d...