{
  "abstract": "Most stars and planets form in massive star-forming regions, where disks are exposed to external far-ultraviolet (FUV) radiation from nearby O- and B-type stars. The combined effects of stellar irradiation and external FUV fields on terrestrial planet-forming regions (< 10 au) across stellar masses remain unclear. We investigate how internal UV and X-ray irradiation and external FUV fields affect mid-infrared (mid-IR) gas emission and the atmospheric carbon-to-oxygen (C/O) ratios inferred in T Tauri and Herbig Ae/Be disks. We compute disk structures with ProDiMo and synthetic spectra with FLiTs, convolved to a representative JWST/MIRI-MRS resolution (R$\\sim$2680). (1) We present the Internal and external irRadIation of diSks (IRIS) grid: four model sets spanning stellar masses of 0.3-4.0 solar masses, including stellar X-ray flares and an external FUV field of 1e4 G0 (Habing units). (2) We predict increasing flux densities with stellar mass for key atomic and molecular mid-IR tracers. (3) External FUV irradiation enhances CH3+ and H2 emission, whereas FUV-induced disk truncation yields inner disk chemistry resembling that of disks irradiated only by their host stars. (4) Mid-IR H2O, CO2, and C2H2 line ratios imply carbon-rich compositions (C/O$\\sim$1-10) in the warm emitting layers of T Tauri and Herbig Ae/Be disks, primarily reflecting stellar irradiation, with little sensitivity to external FUV irradiation. The IRIS grid provides a flexible framework for interpreting JWST and future Extremely Large Telescope (ELT) infrared disk observations across a broad range of stellar properties and irradiation conditions. Future models should include FUV-driven photoevaporative winds, X-ray radiative transfer, and time-dependent X-ray irradiation.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.08621",
  "author_total": 21,
  "authors": [
    {
      "name": "Jenny Frediani"
    },
    {
      "name": "Konstantin V. Getman"
    },
    {
      "name": "Peter Woitke"
    },
    {
      "name": "Bayron Portilla-Revelo"
    },
    {
      "name": "Eric D. Feigelson"
    },
    {
      "name": "Christian Rab"
    },
    {
      "name": "Arjan Bik"
    },
    {
      "name": "María Claudia Ramírez-Tannus"
    },
    {
      "name": "Rens Waters"
    },
    {
      "name": "Thomas Henning"
    },
    {
      "name": "Inga Kamp"
    },
    {
      "name": "Germán Chaparro"
    },
    {
      "name": "Sebastián Hernández"
    },
    {
      "name": "Simón Rodríguez"
    },
    {
      "name": "Pablo Cuartas-Restrepo"
    },
    {
      "name": "Andrew Winter"
    },
    {
      "name": "Thomas J. Haworth"
    },
    {
      "name": "Thomas Preibisch"
    },
    {
      "name": "Sierk E. van Terwisga"
    },
    {
      "name": "Veronica Roccatagliata"
    },
    {
      "name": "Alexis Brandeker"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/538byaz9a2f63.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.08621",
  "fulltext_url": null,
  "id": "538byaz9a2f63",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.08621",
  "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.EP"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ],
    [
      "openalex",
      "3103|Astrophysics and Star Formation Studies"
    ]
  ],
  "openalex": "W7212058132",
  "pdf_url": "https://arxiv.org/pdf/2609.08621",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/538byaz9a2f63.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:52Z",
      "native_id": "2609.08621",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.08621"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "XUE. ProDiMo models of internally and externally irradiated planet-forming disks around 0.3-4.0 solar mass stars (The IRIS project I)",
  "title_text": "XUE. ProDiMo models of internally and externally irradiated planet-forming disks around 0.3-4.0 solar mass stars (The IRIS project I)",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:52Z",
  "url": "https://research.draconitic.com/paper/538byaz9a2f63",
  "venue": "arXiv",
  "versions": []
}