Follow-up of SN 2025wny II: Superluminous Supernova Physics at Cosmic Noon

@misc{li2026followup,
  title = {{Follow-up of SN 2025wny II: Superluminous Supernova Physics at Cosmic Noon}},
  author = {Maggie L. Li and Lin Yan and Anamaria Gkini and Alice Townsend and Yu-Jing Qin and Steve Schulze and Nikhil Sarin and Suhail Dhawan and Joel Johansson and Ariel Goobar and Jacob Osman Hjortlund and Edvard Mörtsell and Jesper Sollerman and Ragnhild Lunnan and Daniel A. Perley and Ehud Nakhar and Avinash Singh and Avishay Gal-Yam and Mansi M. Kasliwal and Conor M. B. Omand and Aleksandra Bochenek and Malte Busmann and Kaustav K. Das and Christoffer Fremling and Alexa C. Gordon and Daniel Gruen and Wynn Jacobson-Galán and K-Ryan Hinds and Chang Liu and Zoë McGrath and Ezequiel J. Marchesini and Christopher Martin and Peter Massey and Martijn S. S. L. Oei and Eliana Palazzi and Francisco Prada and Nikolaus Z. Prusinski and Nabeel Rehemtulla and Andrea Rossi and R. Michael Rich and Sam Rose and Killa Santer and Surya Shivaprasad and Hannah C. Turner and Chiara Ventura and Jacob L. Wise and Michael Coughlin and Argyro Sasli and Niharika Sravan},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.28415},
  eprint = {2608.28415},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.28415},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Follow-up of SN 2025wny II: Superluminous Supernova Physics at Cosmic Noon
AU  - Maggie L. Li
AU  - Lin Yan
AU  - Anamaria Gkini
AU  - Alice Townsend
AU  - Yu-Jing Qin
AU  - Steve Schulze
AU  - Nikhil Sarin
AU  - Suhail Dhawan
AU  - Joel Johansson
AU  - Ariel Goobar
AU  - Jacob Osman Hjortlund
AU  - Edvard Mörtsell
AU  - Jesper Sollerman
AU  - Ragnhild Lunnan
AU  - Daniel A. Perley
AU  - Ehud Nakhar
AU  - Avinash Singh
AU  - Avishay Gal-Yam
AU  - Mansi M. Kasliwal
AU  - Conor M. B. Omand
AU  - Aleksandra Bochenek
AU  - Malte Busmann
AU  - Kaustav K. Das
AU  - Christoffer Fremling
AU  - Alexa C. Gordon
AU  - Daniel Gruen
AU  - Wynn Jacobson-Galán
AU  - K-Ryan Hinds
AU  - Chang Liu
AU  - Zoë McGrath
AU  - Ezequiel J. Marchesini
AU  - Christopher Martin
AU  - Peter Massey
AU  - Martijn S. S. L. Oei
AU  - Eliana Palazzi
AU  - Francisco Prada
AU  - Nikolaus Z. Prusinski
AU  - Nabeel Rehemtulla
AU  - Andrea Rossi
AU  - R. Michael Rich
AU  - Sam Rose
AU  - Killa Santer
AU  - Surya Shivaprasad
AU  - Hannah C. Turner
AU  - Chiara Ventura
AU  - Jacob L. Wise
AU  - Michael Coughlin
AU  - Argyro Sasli
AU  - Niharika Sravan
PY  - 2026
DA  - 2026/08/28
PB  - arXiv
DO  - 10.48550/arxiv.2608.28415
UR  - https://arxiv.org/abs/2608.28415
AB  - 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 post-peak (rest frame) from several facilities, including JWST, Keck, VLT, Gemini, the Palomar 200-inch, the Fraunhofer Telescope at Wendelstein, and the Liverpool Telescope. Correcting for lensing magnification, SN 2025wny reaches a peak pseudo-bolometric luminosity of L_peak≳4×10^44 erg s^−1 over rest-frame 1500-4230 Å, placing it within the luminosity range of typical SLSNe-I. SN 2025wny exhibits several unusual features, including a continuum excess and sharp spectral features in the FUV from +20-60 d that coincide with an FUV light-curve plateau and higher inferred blackbody temperatures. SN 2025wny's spectra also show little to no UV line blanketing, no obvious O II absorption despite high temperatures, and evidence for C II, Hα, and possible He I. Light-curve modeling suggests that SN 2025wny may require a hybrid or non-standard power source. This work provides some of the first detailed constraints on high-redshift SLSNe and establishes SN 2025wny as an essential spectral and photometric reference for identifying and interpreting high-redshift SLSNe discovered by Rubin and Roman.
ER  -