{
  "abstract": "Magnetic-field amplification and angular momentum (AM) transport critically shape the secular evolution, lifetime, and electromagnetic signatures of binary neutron-star merger remnants. While the magnetorotational instability can operate in the outer negative-shear regions of the neutron-star remnant and accretion disk, the positive-shear, stably stratified core may instead be susceptible to the Tayler–Spruit dynamo. We present the first global, long-term, general-relativistic, neutrino-radiation, magnetohydrodynamics simulations of a neutron-star merger remnant incorporating the unresolved Tayler–Spruit dynamo through a new mean-field dynamo subgrid prescription. Our axisymmetric simulations starting from a realistic merger remnant show that the Tayler–Spruit dynamo is primarily active in high-latitude regions of the remnant core. The resulting Maxwell stresses redistribute AM on a spin-down timescale of a few hundred milliseconds, substantially flattening the core rotation profile and transferring mass and AM from the outer remnant into the disk. This produces a more massive, extended, and strongly magnetized disk with a low electron fraction, leading to substantially more neutron-rich ejecta. Our results demonstrate that currently unmodeled Tayler–Spruit dynamo action can qualitatively alter the rotational evolution, collapse prospects, disk formation, and multimessenger signatures of long-lived neutron-star merger remnants.",
  "abstract_shown": true,
  "affiliations": [
    "California Institute of Technology"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 2,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Harry Ho-Yin Ng",
      "orcid": "0000-0003-3453-7394"
    },
    {
      "affs": [
        0
      ],
      "name": "Elias R. Most",
      "orcid": "0000-0002-0491-1210"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bg07rck2emwsb.bib",
  "cited_by": 0,
  "doi": "10.3847/2041-8213/aeac1b",
  "fulltext_url": null,
  "id": "bg07rck2emwsb",
  "issns": [
    "2041-8205",
    "2041-8213"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/2041-8213/aeac1b",
  "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|Pulsars and Gravitational Waves Research"
    ]
  ],
  "openalex": "W7171996077",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/2041-8213/aeac1b/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/bg07rck2emwsb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:13Z",
      "native_id": "10.3847/2041-8213/aeac1b",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/2041-8213/aeac1b"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Pulsars and Gravitational Waves Research",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Spinning Down Neutron-star Merger Remnants with the Tayler–Spruit Dynamo: Global Simulations Reveal the Formation of Massive Disks and Neutron-rich Ejecta",
  "title_text": "Spinning Down Neutron-star Merger Remnants with the Tayler–Spruit Dynamo: Global Simulations Reveal the Formation of Massive Disks and Neutron-rich Ejecta",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:13Z",
  "url": "https://research.draconitic.com/paper/bg07rck2emwsb",
  "venue": "The Astrophysical Journal Letters",
  "versions": []
}