{
  "abstract": "We continued our analysis of the O-C diagram of the EW-type eclipsing binary V405 Dra using recently available data. We refined the orbital parameters of the third body responsible for the short-period oscillations in the O-C curve, obtaining $P_3=513.12(20)$ d, $a_{12}\\sin i_3=0.3862(15)$ AU, and $e_3=0.1690(48)$. Assuming a total mass of $1.56$ $M_\\odot$ for the eclipsing binary, the minimum mass of the third body is estimated to be about $0.5$ $M_\\odot$. We also investigated the complex long-term O-C trend and found that it may be partially explained by the light-time effect caused by a possible fourth body, with a characteristic period of about 23.5 yr and a minimum mass of about $0.9$ $M_\\odot$. However, the fourth-body model cannot fully reproduce the observed long-term variation, particularly the earliest data, and the nature of part of the long-term trend remains unexplained.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.35422",
  "author_total": 2,
  "authors": [
    {
      "name": "Maksym Yu. Pyatnytskyy"
    },
    {
      "name": "Ivan L. Andronov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4det9z6b0b4vp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.35422",
  "fulltext_url": null,
  "id": "4det9z6b0b4vp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.35422",
  "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.SR"
    ],
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7214768760",
  "pdf_url": "https://arxiv.org/pdf/2609.35422",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4det9z6b0b4vp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.35422",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.35422"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "V405 Draconis: A Deep Contact Binary with a Tertiary Companion and a Quadruple System Candidate",
  "title_text": "V405 Draconis: A Deep Contact Binary with a Tertiary Companion and a Quadruple System Candidate",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/4det9z6b0b4vp",
  "venue": "arXiv",
  "versions": []
}