{
  "abstract": "We present a lensing and cosmographic analysis of the strongly lensed Type I superluminous supernova SN 2025wny at redshift $z=2.015$, multiply imaged by two foreground galaxies at $z=0.376$. Using imaging obtained with the Hubble Space Telescope and the James Webb Space Telescope, we model the lens system with two elliptical power-law mass distributions and an external shear component. In addition to the supernova image positions, the modelling incorporates the surface-brightness distribution of the lensed host galaxy. The inferred Einstein radii are $θ_{\\rm E,1}\\simeq 1.6$\" and $θ_{\\rm E,2}\\simeq 0.7$ - $0.8$\", with broadly consistent results across all filters. After accounting for microlensing by stars in the lens galaxies, the posterior distribution spans total magnifications of approximately $μ_{\\rm tot}\\sim 5$--$50$, with flux ratios of the multiple images consistent with observations. Combining the lens models with spectroscopically and photomerically measured time delays yields a filter-marginalized constraint of \\[ H_0 = 66.7^{+7.6}_{-6.3}\\; {\\rm km\\,s^{-1}\\,Mpc^{-1}}, \\] for a fiducial model with isothermal mass profiles. Allowing the density slopes of the lens galaxies to vary over a broad range results in \\[ H_0 = 70.8^{+8.2}_{-6.1}\\; {\\rm km\\,s^{-1}\\,Mpc^{-1}}. \\] These values are conditional on the adopted parameterization of the lens mass distribution, the assumed priors on the density slopes, and possible additional lensing contributions from the surrounding large-scale environment. We find that incorporating the currently available stellar kinematic measurements has only a modest effect on the inferred value of $H_0$. Future measurements of the lens-galaxy kinematics and a detailed characterization of the lens environment will further strengthen the utility of SN 2025wny as a cosmological probe.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.28430",
  "author_total": 15,
  "authors": [
    {
      "name": "Edvard Mörtsell"
    },
    {
      "name": "Joel Johansson"
    },
    {
      "name": "Ariel Goobar"
    },
    {
      "name": "Alice Townsend"
    },
    {
      "name": "Hannah C. Turner"
    },
    {
      "name": "Suhail Dhawan"
    },
    {
      "name": "Cameron Lemon"
    },
    {
      "name": "Peter Nugent"
    },
    {
      "name": "Thomas E. Collett"
    },
    {
      "name": "Stephen Thorp"
    },
    {
      "name": "Jacob Osman Hjortlund"
    },
    {
      "name": "Jakob Nordin"
    },
    {
      "name": "Lin Yan"
    },
    {
      "name": "Graham P. Smith"
    },
    {
      "name": "Christoffer Fremling"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0jp29cq2v321k.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.28430",
  "fulltext_url": null,
  "id": "0jp29cq2v321k",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.28430",
  "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"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7204795550",
  "pdf_url": "https://arxiv.org/pdf/2608.28430",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0jp29cq2v321k.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "2608.28430",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.28430"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    }
  ],
  "title": "Follow-up of SN 2025wny V: Lens Modelling and Cosmography of a Strongly Lensed Superluminous Supernova at $z = 2.015$ using Space Data",
  "title_text": "Follow-up of SN 2025wny V: Lens Modelling and Cosmography of a Strongly Lensed Superluminous Supernova at z = 2.015 using Space Data",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:22Z",
  "url": "https://research.draconitic.com/paper/0jp29cq2v321k",
  "venue": "arXiv",
  "versions": []
}