{
  "abstract": "We present optical photometric and optical/near-infrared spectroscopic observations of SN 2025wiu, a Type Ib supernova (SN) at z = 0.046927. The r-band light curve exhibits an initial maximum of approximately -18.2 mag, followed by a weaker optical rebrightening reaching approximately -17.8 mag at +38 days in the rest frame relative to the first maximum. However, the reconstructed bolometric light curve does not show a distinct second peak, but instead exhibits a reduced decline rate during the corresponding phase. The spectra consistently show Type Ib features without narrow emission components associated with circumstellar material. The late-time bolometric decline rate of 0.054 +/- 0.008 mag/day is faster than expected for complete trapping of 56Co decay. A radioactive-decay model for the first peak requires nickel mass = 0.47 solar masses, above the range typical of SNe Ib. A combined radioactive-decay and circumstellar-interaction model reproduces the full bolometric light curve with nickel mass ~ 0.38 solar masses, ejecta mass ~ 4.7 solar masses, and an effective circumstellar mass of ~ 0.10 solar masses, with the interaction contributing from the first peak onward. The lack of interaction signatures in the spectra favours an aspherical, disk-like circumstellar structure engulfed by the ejecta, in which the interaction energy is thermalized below the ejecta photosphere; the fitted circumstellar parameters are therefore effective values rather than direct measurements of the circumstellar geometry. SN 2025wiu demonstrates that optical rebrightening does not necessarily imply a genuine bolometric secondary maximum and highlights the importance of multi-band observations for identifying the powering mechanisms of double-peaked stripped-envelope supernovae.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.23414",
  "author_total": 18,
  "authors": [
    {
      "name": "Cheng-Han Lai"
    },
    {
      "name": "Ting-Wan Chen"
    },
    {
      "name": "Yu-Hao Zhang"
    },
    {
      "name": "Liang-Duan Liu"
    },
    {
      "name": "Jesper Sollerman"
    },
    {
      "name": "Amar Aryan"
    },
    {
      "name": "Anirban Dutta"
    },
    {
      "name": "Sheng Yang"
    },
    {
      "name": "Christoffer Fremling"
    },
    {
      "name": "Matthew J. Graham"
    },
    {
      "name": "David Hale"
    },
    {
      "name": "K. -Ryan Hinds"
    },
    {
      "name": "Mansi M. Kasliwal"
    },
    {
      "name": "Frank J. Masci"
    },
    {
      "name": "Reed L. Riddle"
    },
    {
      "name": "Sam Rose"
    },
    {
      "name": "Ben Rusholme"
    },
    {
      "name": "Niharika Sravan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9r7r9hv6q3sc3.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.23414",
  "fulltext_url": null,
  "id": "9r7r9hv6q3sc3",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.23414",
  "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.HE"
    ],
    [
      "openalex",
      "3103|Gamma-ray bursts and supernovae"
    ]
  ],
  "openalex": "W7222948472",
  "pdf_url": "https://arxiv.org/pdf/2610.23414",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9r7r9hv6q3sc3.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:32Z",
      "native_id": "2610.23414",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.23414"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "SN 2025wiu: A Type Ib Supernova with Post-Peak Optical Rebrightening",
  "title_text": "SN 2025wiu: A Type Ib Supernova with Post-Peak Optical Rebrightening",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:28Z",
  "url": "https://research.draconitic.com/paper/9r7r9hv6q3sc3",
  "venue": "arXiv",
  "versions": []
}