{
  "abstract": "The formation of neutron stars (NSs) underpins astrophysical phenomena from supernovae (SNe), radio pulsars and X-ray binaries to double NS mergers that power gravitational waves (GWs), short gamma-ray bursts and r-process kilonovae. A recently reported double NS (PSR J0653+0443) with record eccentricity e=0.9924 provides a unique laboratory for studying GW emission and orbital evolution, and challenges existing formation scenarios. Here we show that such extreme eccentricities arise naturally -- without invoking exotic conditions -- from standard binary-SN physics: instantaneous mass loss (Blaauw recoil) and natal kicks readily produce e>0.99 for both compact and wide pre-SN orbits. The observed orbit matches three families of kinematic solutions spanning a range of kick velocities and progenitor configurations. Physically motivated priors based on NS spin and pre-SN mass transfer constrain the viable progenitor family, demonstrating that the system is not exceptionally rare. Future proper-motion measurements will tightly constrain its natal SN kick magnitude.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.37759",
  "author_total": 1,
  "authors": [
    {
      "name": "Thomas M. Tauris"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fcdphwqh8ja3p.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.37759",
  "fulltext_url": null,
  "id": "fcdphwqh8ja3p",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.37759",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.37759",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fcdphwqh8ja3p.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.37759",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.37759"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "Extreme eccentricity in double neutron stars without exotic physics",
  "title_text": "Extreme eccentricity in double neutron stars without exotic physics",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:44Z",
  "url": "https://research.draconitic.com/paper/fcdphwqh8ja3p",
  "venue": "arXiv",
  "versions": []
}