{
  "abstract": "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 $L_{\\rm peak}\\gtrsim4\\times10^{44}$ 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, H$α$, 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.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.28415",
  "author_total": 49,
  "authors": [
    {
      "name": "Maggie L. Li"
    },
    {
      "name": "Lin Yan"
    },
    {
      "name": "Anamaria Gkini"
    },
    {
      "name": "Alice Townsend"
    },
    {
      "name": "Yu-Jing Qin"
    },
    {
      "name": "Steve Schulze"
    },
    {
      "name": "Nikhil Sarin"
    },
    {
      "name": "Suhail Dhawan"
    },
    {
      "name": "Joel Johansson"
    },
    {
      "name": "Ariel Goobar"
    },
    {
      "name": "Jacob Osman Hjortlund"
    },
    {
      "name": "Edvard Mörtsell"
    },
    {
      "name": "Jesper Sollerman"
    },
    {
      "name": "Ragnhild Lunnan"
    },
    {
      "name": "Daniel A. Perley"
    },
    {
      "name": "Ehud Nakhar"
    },
    {
      "name": "Avinash Singh"
    },
    {
      "name": "Avishay Gal-Yam"
    },
    {
      "name": "Mansi M. Kasliwal"
    },
    {
      "name": "Conor M. B. Omand"
    },
    {
      "name": "Aleksandra Bochenek"
    },
    {
      "name": "Malte Busmann"
    },
    {
      "name": "Kaustav K. Das"
    },
    {
      "name": "Christoffer Fremling"
    },
    {
      "name": "Alexa C. Gordon"
    },
    {
      "name": "Daniel Gruen"
    },
    {
      "name": "Wynn Jacobson-Galán"
    },
    {
      "name": "K-Ryan Hinds"
    },
    {
      "name": "Chang Liu"
    },
    {
      "name": "Zoë McGrath"
    },
    {
      "name": "Ezequiel J. Marchesini"
    },
    {
      "name": "Christopher Martin"
    },
    {
      "name": "Peter Massey"
    },
    {
      "name": "Martijn S. S. L. Oei"
    },
    {
      "name": "Eliana Palazzi"
    },
    {
      "name": "Francisco Prada"
    },
    {
      "name": "Nikolaus Z. Prusinski"
    },
    {
      "name": "Nabeel Rehemtulla"
    },
    {
      "name": "Andrea Rossi"
    },
    {
      "name": "R. Michael Rich"
    },
    {
      "name": "Sam Rose"
    },
    {
      "name": "Killa Santer"
    },
    {
      "name": "Surya Shivaprasad"
    },
    {
      "name": "Hannah C. Turner"
    },
    {
      "name": "Chiara Ventura"
    },
    {
      "name": "Jacob L. Wise"
    },
    {
      "name": "Michael Coughlin"
    },
    {
      "name": "Argyro Sasli"
    },
    {
      "name": "Niharika Sravan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0t5hjycdmkdrj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.28415",
  "fulltext_url": null,
  "id": "0t5hjycdmkdrj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.28415",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "openalex",
      "3103|Gamma-ray bursts and supernovae"
    ]
  ],
  "openalex": "W7204800341",
  "pdf_url": "https://arxiv.org/pdf/2608.28415",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0t5hjycdmkdrj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "2608.28415",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.28415"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Follow-up of SN 2025wny II: Superluminous Supernova Physics at Cosmic Noon",
  "title_text": "Follow-up of SN 2025wny II: Superluminous Supernova Physics at Cosmic Noon",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:22Z",
  "url": "https://research.draconitic.com/paper/0t5hjycdmkdrj",
  "venue": "arXiv",
  "versions": []
}