{
  "abstract": "The study of massive stars in binary and higher-multiplicity systems that participate in particle acceleration is a key topic at the crossroads of massive star physics, shock physics, and galactic cosmic ray astrophysics. From an observational perspective, radio measurements are our pri- mary tool for identifying these systems through their synchrotron radio emission. Out of the 54 such systems known to date, all but two have been discovered via their non-thermal radio emission. However, identifying these systems is not straightforward. The main challenge lies in free-free absorption, which can obscure the synchrotron signature and hinder detection. This paper summarizes recent developments in our understanding of these systems, with a particular focus on the strong observational bias introduced by free-free absorption. This bias significantly limits our ability to determine the true fraction of particle accelerators among colliding-wind binaries.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.12907",
  "author_total": 7,
  "authors": [
    {
      "name": "Michaël De Becker"
    },
    {
      "name": "Agustina Belen Blanco"
    },
    {
      "name": "Mathilde Tasseroul"
    },
    {
      "name": "Anandmayee Tej"
    },
    {
      "name": "Anindya Saha"
    },
    {
      "name": "Paula Benaglia"
    },
    {
      "name": "Santiago del Palacio"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/f3a782svjmd7j.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.12907",
  "fulltext_url": null,
  "id": "f3a782svjmd7j",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.12907",
  "language": null,
  "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.HE"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ],
    [
      "openalex",
      "3106|Astrophysics and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7212902328",
  "pdf_url": "https://arxiv.org/pdf/2609.12907",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-11",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/f3a782svjmd7j.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:07Z",
      "native_id": "2609.12907",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.12907"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "The influence of free-free absorption on the radio spectrum of Particle-Accelerating Colliding-Wind Binaries",
  "title_text": "The influence of free-free absorption on the radio spectrum of Particle-Accelerating Colliding-Wind Binaries",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:07Z",
  "url": "https://research.draconitic.com/paper/f3a782svjmd7j",
  "venue": "arXiv",
  "versions": []
}