Follow-up of SN 2025wny I: Space-based Observations of the First Multiply-imaged Superluminous Supernova

@misc{goobar2026followup,
  title = {{Follow-up of SN 2025wny I: Space-based Observations of the First Multiply-imaged Superluminous Supernova}},
  author = {Ariel Goobar and Joel Johansson and Edvard Mörtsell and Cameron Lemon and Steve Schulze and Suhail Dhawan and Alice Townsend and Maggie L. Li and Yu-Jing Qin and Lin Yan and Christoffer Fremling and Mansi M. Kasliwal and Peter Nugent and Graham P. Smith and Jesper Sollerman and Igor Andreoni and Nikki Arendse and Thomas E. Collett and Jakob Nordin and Jacob Osman Hjortlund and Daniel A. Perley and Mickael Rigault and Stephen Thorp and Jacob L. Wise},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.28413},
  eprint = {2608.28413},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.28413},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Follow-up of SN 2025wny I: Space-based Observations of the First Multiply-imaged Superluminous Supernova
AU  - Ariel Goobar
AU  - Joel Johansson
AU  - Edvard Mörtsell
AU  - Cameron Lemon
AU  - Steve Schulze
AU  - Suhail Dhawan
AU  - Alice Townsend
AU  - Maggie L. Li
AU  - Yu-Jing Qin
AU  - Lin Yan
AU  - Christoffer Fremling
AU  - Mansi M. Kasliwal
AU  - Peter Nugent
AU  - Graham P. Smith
AU  - Jesper Sollerman
AU  - Igor Andreoni
AU  - Nikki Arendse
AU  - Thomas E. Collett
AU  - Jakob Nordin
AU  - Jacob Osman Hjortlund
AU  - Daniel A. Perley
AU  - Mickael Rigault
AU  - Stephen Thorp
AU  - Jacob L. Wise
PY  - 2026
DA  - 2026/08/28
PB  - arXiv
DO  - 10.48550/arxiv.2608.28413
UR  - https://arxiv.org/abs/2608.28413
AB  - We present space-based follow-up observations of the superluminous Type I supernova (SLSN-I) SN 2025wny at redshift z_SN=2.0151, gravitationally lensed by two galaxies at redshifts z_G1=0.3755 and z_G2=0.3766 into five resolved images. SN 2025wny is the first strongly lensed SLSN discovered and the first galaxy-scale lensed supernova for which both photometric and spectroscopic time-delay measurements are feasible. As such, it opens a new observational window for precision cosmology and the study of stellar explosions near the epoch of peak cosmic star formation. Our follow-up observations comprise two epochs of Hubble Space Telescope (HST) imaging, together with near-infrared imaging and spectroscopy obtained with the James Webb Space Telescope (JWST). From these data, we measure precise astrometry and multi-band photometry for the five resolved supernova images, the host galaxy, and the two deflecting galaxies. HST provides accurate relative image positions and rest-frame ultraviolet photometry, while JWST delivers complementary near-infrared imaging and spectroscopy probing the rest-frame optical at high signal-to-noise ratio. Together they yield a detailed characterization of both the lensing configuration and the supernova spectral energy distribution over a broad wavelength range. The data presented here provide the observational foundation for the accompanying analyses of the supernova properties, lens modeling, and time-delay cosmography, including the astrometric, photometric, and spectroscopic information required to measure H_0.
ER  -