{
  "abstract": "We present the validation and dynamical characterization of TOI-789 (TIC 300710077), a compact multiplanet system around an M3 dwarf at 43 pc. Using ∼7 yr of TESS photometry (42 sectors), public ground-based follow-up (LCOGT, MEarth), and high-resolution imaging (Gemini/Zorro, SOAR), we statistically validate three terrestrial planets with TRICERATOPS: TOI-789 b ( R p = 1.18 R ⊕ , P = 5.45 days), c (1.15 R ⊕ , 8.04 days), and d (1.40 R ⊕ , 12.97 days), with false-positive and nearby-false-positive probabilities below the validation thresholds once resolved neighbours are excluded using the on-target ground-based photometry. Through an iterative Transit Least Squares search we identify a fourth, previously uncatalogued planet candidate ( P = 19.74 days, R p ≈ 0.88 R ⊕ ), the outermost and most temperate member ( S = 1.71 S ⊕ , T eq ≈ 292 K); its low signal-to-noise ratio precludes formal validation, so we report it as a candidate pending confirmation. A dynamical analysis (SPOCK and N -body integrations) indicates a dynamically cold, near-resonant system that is stable only for low eccentricities ( e ≲ 0.05); it is eccentricity rather than planetary mass that limits the system's stability, and including the fourth candidate tightens this constraint further. The four objects span the Earth–Venus transition across the Venus zone, with two validated planets falling in the temperate regime under the equilibrium-temperature criterion, making the system a potential comparative-planetology laboratory anchored on confirmed planets. The low TSM (∼3–5) and moderate host brightness place atmospheric characterization beyond reach. TOI-789 exemplifies the numerically dominant population of compact terrestrial-planet systems around M dwarfs whose characterization is limited by host brightness for which dynamical characterization offers a complementary route.",
  "abstract_shown": true,
  "affiliations": [
    "Independent Researcher, Málaga, ; jfpages@gmail.com"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 1,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Juan F. Pagés Navarrete",
      "orcid": "0009-0006-7910-4276"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5jqj581j6q1ke.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-3881/aea6c9",
  "fulltext_url": null,
  "id": "5jqj581j6q1ke",
  "issns": [
    "0004-6256",
    "1538-3881"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-3881/aea6c9",
  "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|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7214058589",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-3881/aea6c9/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/5jqj581j6q1ke.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:14Z",
      "native_id": "10.3847/1538-3881/aea6c9",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-3881/aea6c9"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Characterization of the Compact Multiplanet System TOI-789: Validation of Three Terrestrial Planets, Dynamical Characterization, and Detection of a Fourth Temperate Candidate",
  "title_text": "Characterization of the Compact Multiplanet System TOI-789: Validation of Three Terrestrial Planets, Dynamical Characterization, and Detection of a Fourth Temperate Candidate",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:14Z",
  "url": "https://research.draconitic.com/paper/5jqj581j6q1ke",
  "venue": "The Astronomical Journal",
  "versions": [
    {
      "doi": "10.48550/arxiv.2609.22945",
      "pid": "beppwebdg2htw",
      "relation": "preprint",
      "title": "Characterization of the Compact Multi-planet System TOI-789: Validation of Three Terrestrial Planets, Dynamical Characterization, and Detection of a Fourth Temperate Candidate",
      "venue": "arXiv"
    }
  ]
}