{
  "abstract": "Pulse-profile modeling of rotation-powered millisecond pulsars targeted by NICER has enabled mass–radius constraints of several neutron star sources, with implications for the dense-matter equation of state. For the bright isolated pulsar PSR J0030+0451, the inferred mass and radius were previously found to depend strongly on the assumed hot-spot model. These hot-spot models yielded different mass–radius constraints, with the statistically preferred model exhibiting some mild tension with results inferred for PSR J0437−4715, PSR J0614−3329, and GW170817. We present an updated pulse-profile analysis of PSR J0030+0451 using new NICER observations obtained between 2017 July to 2023 January, increasing the number of X-ray counts by about 50% compared to previous analyses. We jointly analyze the NICER data with archival XMM-Newton observations to better constrain the source spectrum and background. The new analysis, using more conservative nested-sampling settings together with the new NICER observations, significantly reduces the discrepancy between the hot-spot models. The inferred mass and radius are M = 1.4 3 − 0.17 + 0.20 M ⊙ and R eq = 12.6 8 − 1.04 + 1.31 km (68% credible intervals), reducing the tension with the results from other sources. In addition, the inferred hot-spot configurations suggest the presence of intraspot temperature gradients.",
  "abstract_shown": true,
  "affiliations": [
    "University of Amsterdam",
    "IRAP",
    "Université de Toulouse",
    "University of Helsinki",
    "Space Science Division",
    "Deutsches Elektronen Synchrotron DESY",
    "Deutsches Zentrum für Astrophysik (DZA)",
    "Universität Potsdam",
    "Independent Researcher"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 16,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Yves Kini",
      "orcid": "0000-0002-0428-8430"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Lucien Mauviard",
      "orcid": "0000-0002-3408-2759"
    },
    {
      "affs": [
        3
      ],
      "name": "Tuomo Salmi",
      "orcid": "0000-0001-6356-125X"
    },
    {
      "affs": [
        0
      ],
      "name": "Anna L. Watts",
      "orcid": "0000-0002-1009-2354"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Sébastien Guillot",
      "orcid": "0000-0002-6449-106X"
    },
    {
      "affs": [
        0
      ],
      "name": "Bas Dorsman",
      "orcid": "0000-0002-9407-0733"
    },
    {
      "affs": [
        0
      ],
      "name": "Devarshi Choudhury",
      "orcid": "0000-0002-2651-5286"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Denis González–Caniulef",
      "orcid": "0000-0001-5848-0180"
    },
    {
      "affs": [
        0
      ],
      "name": "Mariska Hoogkamer",
      "orcid": "0009-0005-8019-0426"
    },
    {
      "affs": [
        0
      ],
      "name": "Daniela Huppenkothen",
      "orcid": "0000-0002-1169-7486"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Christine Kazantsev",
      "orcid": "0009-0008-3894-4783"
    },
    {
      "affs": [
        4
      ],
      "name": "Matthew T. Kerr",
      "orcid": "0000-0002-0893-4073"
    },
    {
      "affs": [
        5,
        6,
        0,
        7
      ],
      "name": "S. Nissanke",
      "orcid": "0000-0001-6573-7773"
    },
    {
      "affs": [
        4
      ],
      "name": "Paul S. Ray",
      "orcid": "0000-0002-5297-5278"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Pierre Stammler",
      "orcid": "0009-0005-7766-5638"
    },
    {
      "affs": [
        8
      ],
      "name": "S. Vinciguerra",
      "orcid": "0000-0003-3068-6974"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2xsrtxkgecth2.bib",
  "cited_by": 34,
  "doi": "10.3847/1538-4357/ae733e",
  "fulltext_url": null,
  "id": "2xsrtxkgecth2",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://doi.org/10.3847/1538-4357/ae733e",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Pulsars and Gravitational Waves Research"
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  "openalex": "W7167505299",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-07-06",
  "publisher": "IOP Publishing",
  "ris": "https://research.draconitic.com/paper/2xsrtxkgecth2.ris",
  "sources": [
    {
      "first_seen": "2026-11-08T13:20:37Z",
      "native_id": "W7167505299",
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      "url": "https://doi.org/10.3847/1538-4357/ae733e"
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  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Pulsars and Gravitational Waves Research",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "A NICER View of PSR J0030+0451: Updated Constraints from 6 yr of NICER Observations",
  "title_text": "A NICER View of PSR J0030+0451: Updated Constraints from 6 yr of NICER Observations",
  "type": "peer-reviewed",
  "updated_at": "2026-11-09T13:21:01Z",
  "url": "https://research.draconitic.com/paper/2xsrtxkgecth2",
  "venue": "The Astrophysical Journal",
  "versions": []
}