{
  "abstract": "We report the discovery of a nearby FU Ori–type outburst (FUor), PR Ori B, in the L1641 cluster of the Orion star-forming region. The high-amplitude variability was first identified in the NEOWISE (3–5 μ m) photometry of the unresolved PR Ori binary system. Long-term, resolved optical photometric monitoring demonstrates that PR Ori B is the driver of a Δ G = 5 mag outburst, while PR Ori A has remained constant over the past 20 yr. The near-IR spectrum of PR Ori B changes from a late K-type spectral type during quiescence to a viscously heated disk during outburst, including deep absorption in ¹² CO and H ₂ O bands. The optical spectrum also exhibits features that are commonly associated with FUors, including P Cygni profiles in Na i D lines and absorption in the Ca ii infrared triplet. The luminosity of the outburst ( L acc ∼ 30–40 L ⊙ ) is similar to that commonly observed in FUors. The comparison of Spitzer/Infrared Spectrograph and Very Large Telescope/VISIR spectroscopy shows some evidence of silicate crystallization during the outburst. PR Ori B is one of the closest and brightest FUors discovered over the past few years, only one magnitude fainter than the archetype of the class FU Ori. The proximity and brightness will allow for future high angular resolution observations to probe the physics of the inner disk and to evaluate changes in the disk due to the increased luminosity.",
  "abstract_shown": true,
  "affiliations": [
    "Seoul National University",
    "HUN-REN Research Centre for Astronomy and Earth Sciences",
    "Peking University",
    "University of Vienna",
    "NRC Herzberg Astronomy and Astrophysics",
    "University of Victoria",
    "University of Hawaii at Manoa",
    "Planetary Science Institute",
    "Korea Astronomy and Space Science Institute",
    "Indian Institute of Science Education and Research Tirupati",
    "Department of Astrophysical and Planetary Sciences University of Colorado",
    "Université de Toulouse",
    "Chinese Academy of Sciences",
    "University of Science and Technology of China",
    "Universitá di Bologna",
    "INAF Osservatorio Astronomico di Trieste",
    "California Institute of Technology",
    "INAF-Osservatorio Astronomico di Roma",
    "University of the National Education Commission",
    "Kyung Hee University",
    "MTA-ELTE Lendület “Momentum” Milky Way Research Group",
    "ELTE Eötvös Loránd University",
    "European Southern Observatory"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 45,
  "authors": [
    {
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        0
      ],
      "name": "Carlos Contreras Peña",
      "orcid": "0000-0003-1894-1880"
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      "name": "Zsófia Nagy",
      "orcid": "0000-0002-3632-1194"
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      "name": "Gregory 雷歌 Herczeg 沈",
      "orcid": "0000-0002-7154-6065"
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        0
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      "name": "Jeong-Eun 정은 Lee 이",
      "orcid": "0000-0003-3119-2087"
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        1
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      "name": "Ágnes Kóspál",
      "orcid": "0000-0001-7157-6275"
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        3
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      "name": "Péter Ábrahám",
      "orcid": "0000-0001-6015-646X"
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    {
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        4,
        5
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      "name": "Doug Johnstone",
      "orcid": "0000-0002-6773-459X"
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        7
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      "name": "Bo Reipurth",
      "orcid": "0000-0001-8174-1932"
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        0
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      "name": "Chul-Hwan 철환 Kim 김",
      "orcid": "0000-0002-2523-3762"
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    {
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      "name": "Hyun-Il 현일 Sung 성",
      "orcid": "0000-0001-9515-3584"
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      "name": "Yihan Li",
      "orcid": "0009-0006-7226-711X"
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    {
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      "name": "Jiaze Wang"
    },
    {
      "affs": [
        2
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      "name": "Rui Wu"
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    {
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        1
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      "name": "Foteini Lykou",
      "orcid": "0000-0002-6394-8013"
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        9
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      "name": "Mizna Ashraf",
      "orcid": "0009-0000-4741-7055"
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        10
      ],
      "name": "John Bally",
      "orcid": "0000-0001-8135-6612"
    },
    {
      "affs": [
        1,
        11
      ],
      "name": "Fernando Cruz-Saénz de Miera",
      "orcid": "0000-0002-4283-2185"
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    {
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        12,
        13
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      "name": "Min Fang",
      "orcid": "0000-0001-8060-1321"
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    {
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        15
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      "name": "Eleonora Fiorellino",
      "orcid": "0000-0002-5261-6216"
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      "name": "Christoffer Fremling",
      "orcid": "0000-0002-4223-103X"
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        17
      ],
      "name": "Teresa Giannini",
      "orcid": "0000-0002-7035-8513"
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    {
      "affs": [
        9
      ],
      "name": "Jessy Jose",
      "orcid": "0000-0003-4908-4404"
    },
    {
      "affs": [
        16
      ],
      "name": "Mansi Kasliwal",
      "orcid": "0000-0002-5619-4938"
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    {
      "affs": [
        1
      ],
      "name": "Mária Kun",
      "orcid": "0000-0002-7538-5166"
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    {
      "affs": [
        8
      ],
      "name": "Ho-Gyu 호규 Lee 이",
      "orcid": "0000-0002-3808-7143"
    },
    {
      "affs": [
        1,
        18
      ],
      "name": "Michal Siwak",
      "orcid": "0000-0001-5018-3560"
    },
    {
      "affs": [
        1
      ],
      "name": "Máté Szilágyi",
      "orcid": "0000-0002-3648-433X"
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    {
      "affs": [
        8,
        19
      ],
      "name": "Sung-Yong 성용 Yoon 윤",
      "orcid": "0000-0001-6216-0462"
    },
    {
      "affs": [
        1
      ],
      "name": "Zsófia Bora"
    },
    {
      "affs": [
        1,
        20
      ],
      "name": "Borbála Cseh",
      "orcid": "0000-0002-6497-8863"
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    {
      "affs": [
        1,
        21
      ],
      "name": "Ágoston Horti-Dávid"
    },
    {
      "affs": [
        1,
        21
      ],
      "name": "Zsóka Horváth",
      "orcid": "0009-0002-0157-4228"
    },
    {
      "affs": [
        1
      ],
      "name": "András Peter Joó",
      "orcid": "0000-0001-5203-434X"
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    {
      "affs": [
        1,
        21
      ],
      "name": "Csilla Kalup",
      "orcid": "0000-0002-1663-0707"
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    {
      "affs": [
        1,
        21
      ],
      "name": "Klára Lelkes",
      "orcid": "0009-0007-3760-515X"
    },
    {
      "affs": [
        1
      ],
      "name": "András Pál"
    },
    {
      "affs": [
        1
      ],
      "name": "Zsolt Regály",
      "orcid": "0000-0001-5573-8190"
    },
    {
      "affs": [
        1
      ],
      "name": "Krisztián Sárneczky",
      "orcid": "0000-0003-0926-3950"
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    {
      "affs": [
        1
      ],
      "name": "Bálint Seli",
      "orcid": "0000-0002-3658-2175"
    },
    {
      "affs": [
        1
      ],
      "name": "Ádám Sódor",
      "orcid": "0000-0001-7806-2883"
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    {
      "affs": [
        1,
        21
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      "name": "Norton O. Szabó",
      "orcid": "0009-0007-1015-0327"
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    {
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        1
      ],
      "name": "Zsófia Szabó"
    },
    {
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        1
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      "name": "Róbert Szakáts",
      "orcid": "0000-0002-1698-605X"
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    {
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        1
      ],
      "name": "Nóra Takács"
    },
    {
      "affs": [
        22
      ],
      "name": "Miguel Vioque",
      "orcid": "0000-0002-4147-3846"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4nxmat8b13147.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea56e",
  "fulltext_url": null,
  "id": "4nxmat8b13147",
  "issns": [
    "0004-637X",
    "1538-4357"
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  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea56e",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Astrophysics and Star Formation Studies"
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  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea56e/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/4nxmat8b13147.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea56e",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea56e"
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  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Astrophysics and Star Formation Studies",
      "subfield": "stellar"
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  ],
  "title": "The FU Ori Outburst of PR Ori B",
  "title_text": "The FU Ori Outburst of PR Ori B",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/4nxmat8b13147",
  "venue": "The Astrophysical Journal",
  "versions": []
}