{
  "abstract": "Binary populations encode information about the physical conditions of star formation and the subsequent evolution of stellar populations. Adopting a statistical method based on multi-epoch line-of-sight velocity variations, we constrain the binary fraction, $f_b$, of field main-sequence turn-off stars in the Milky Way using data from the second data release of the DESI Milky Way Survey. $f_b$ is found to primarily increase with lower [Fe/H]. At $[\\mathrm{Fe}/\\mathrm{H}]\\gtrsim -1.3$, $f_b$ shows a modest increase with increasing [Mg/Fe], whereas no clear trend is detected at lower [Fe/H]. The apparent variations of $f_b$ with angular momentum and Galactic height are largely explained by their underlying [Fe/H] distributions, while the remaining variations broadly follow differences in [Mg/Fe]. Within overlapping regions of the [Fe/H]--[Mg/Fe] plane, the thin disk, thick disk, stellar halo and GSE populations exhibit no significant differences in their binary fractions. Thus, our measurements indicate that the variation in $f_b$ is dominated by chemical abundance, which could be explained by the metallicity-dependent gas cooling efficiency and fragmentation. The weaker [Mg/Fe] dependence at fixed [Fe/H] might be associated with the formation conditions of stars, with higher [Mg/Fe] stars generally forming earlier under a more gas-rich and turbulent environment.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.11102",
  "author_total": 42,
  "authors": [
    {
      "name": "Tian Qiu"
    },
    {
      "name": "Wenting Wang"
    },
    {
      "name": "Sergey E Koposov"
    },
    {
      "name": "Songting Li"
    },
    {
      "name": "Nathan Sandford"
    },
    {
      "name": "Ting S Li"
    },
    {
      "name": "Joan Najita"
    },
    {
      "name": "Jessica Nicole Aguilar"
    },
    {
      "name": "Steven Ahlen"
    },
    {
      "name": "Davide Bianchi"
    },
    {
      "name": "David Brooks"
    },
    {
      "name": "Aurelio Carnero Rosell"
    },
    {
      "name": "Todd Claybaugh"
    },
    {
      "name": "Andrei Cuceu"
    },
    {
      "name": "Axel de la Macorra"
    },
    {
      "name": "Arjun Dey"
    },
    {
      "name": "Peter Doel"
    },
    {
      "name": "Jaime E Forero-Romero"
    },
    {
      "name": "Enrique Gaztañaga"
    },
    {
      "name": "Satya Gontcho A. Gontcho"
    },
    {
      "name": "Gaston Gutierrez"
    },
    {
      "name": "Stephanie Juneau"
    },
    {
      "name": "Robert Kehoe"
    },
    {
      "name": "Martin Landriau"
    },
    {
      "name": "Laurent Le Guillou"
    },
    {
      "name": "Aaron Meisner"
    },
    {
      "name": "Ramon Miquel"
    },
    {
      "name": "Enrique Paillas"
    },
    {
      "name": "Will Percival"
    },
    {
      "name": "Francisco Prada"
    },
    {
      "name": "Ignasi Pérez-Ràfols"
    },
    {
      "name": "Corentin Ravoux"
    },
    {
      "name": "Graziano Rossi"
    },
    {
      "name": "Eusebio Sanchez"
    },
    {
      "name": "Christoph Saulder"
    },
    {
      "name": "Edward Schlafly"
    },
    {
      "name": "David Schlegel"
    },
    {
      "name": "Michael Schubnell"
    },
    {
      "name": "Joseph Harry Silber"
    },
    {
      "name": "Małgorzata Siudek"
    },
    {
      "name": "Gregory Tarlé"
    },
    {
      "name": "Benjamin Alan Weaver"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5n22wa9j0d3j5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.11102",
  "fulltext_url": null,
  "id": "5n22wa9j0d3j5",
  "issns": [],
  "landing_url": "https://hal.science/hal-05841985v1",
  "language": "en",
  "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.GA"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.astr"
    ],
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7221079719",
  "pdf_url": "https://arxiv.org/pdf/2610.11102",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5n22wa9j0d3j5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:02Z",
      "native_id": "hal-05841985",
      "source": "hal",
      "url": "https://hal.science/hal-05841985v1"
    },
    {
      "first_seen": "2026-10-30T12:27:54Z",
      "native_id": "2610.11102",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.11102"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    },
    {
      "field": "physics",
      "origin": "hal:0.phys",
      "subfield": "general"
    }
  ],
  "title": "The Binary Fraction of Milky Way Field Stars in DESI: Dependence on Chemical Abundance",
  "title_text": "The Binary Fraction of Milky Way Field Stars in DESI: Dependence on Chemical Abundance",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:54Z",
  "url": "https://research.draconitic.com/paper/5n22wa9j0d3j5",
  "venue": "HAL",
  "versions": []
}