{
  "abstract": "Characterizing rocky, habitable zone planets in reflected light is a key science objective for future direct imaging missions, and the ultraviolet (UV) is uniquely suited for supporting the characterization of Earth-like atmospheres. The Hartley-Huggins ozone band at $0.25 ~μ\\mathrm{m}$ remains detectable at low spectral resolution down to $0.1\\%$ PAL $\\mathrm{O}_2$, providing a sensitive proxy for oxygen-bearing chemistry even for Proterozoic-like atmospheres where the visible and near-infrared $\\mathrm{O}_2$ features become inaccessible. This work uses an end-to-end framework for UV starshade spectroscopy of modern Earth analogs that integrates high-fidelity observation simulation, conservative post-processing, and Bayesian spectral retrieval to quantify ozone detection significance. The framework is applied across 108 simulated scenes spanning a range of planet phase angles, system inclinations, and exozodiacal dust densities. The results establish that robust ozone detection with UV-only, $R=7$ reflected light spectroscopy requires a photometric $\\mathrm{SNR} \\sim 30$. UV starshade observations with the Habitable Worlds Observatory achieve this threshold within 3-day integrations for solar-type systems at 10 parsecs with inclinations up to $60^\\circ$ at favorable phases ($\\leq 90^\\circ$). Above this SNR threshold, ozone detections are robust to systematic bias from imperfect exozodi calibration within $\\sim30\\%$, and the median retrieved ozone abundance remains accurate to within one order of magnitude of the true value.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.17377",
  "author_total": 6,
  "authors": [
    {
      "name": "Zahra Ahmed"
    },
    {
      "name": "Stuart Shaklan"
    },
    {
      "name": "Mario Damiano"
    },
    {
      "name": "Armen Tokadjian"
    },
    {
      "name": "Edward W. Schwieterman"
    },
    {
      "name": "Simone D'Amico"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dj7gqg7b3mg2z.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.17377",
  "fulltext_url": null,
  "id": "dj7gqg7b3mg2z",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.17377",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.EP"
    ],
    [
      "arxiv",
      "astro-ph.IM"
    ],
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7221770233",
  "pdf_url": "https://arxiv.org/pdf/2610.17377",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-12",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dj7gqg7b3mg2z.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.17377",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.17377"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    }
  ],
  "title": "Ultraviolet Reflected-Light Spectroscopy of Modern Earth Analogs with Starshade Observations",
  "title_text": "Ultraviolet Reflected-Light Spectroscopy of Modern Earth Analogs with Starshade Observations",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/dj7gqg7b3mg2z",
  "venue": "arXiv",
  "versions": []
}