{
  "abstract": "Ultracool dwarfs are promising targets for detecting and characterising temperate terrestrial exoplanets. Their flux peaks in the near-infrared, beyond the wavelength cut-off of the silicon-based CCDs used by ground-based surveys dedicated to observing them, such as SPECULOOS. We present the on-sky performance of SPIRIT (SPeculoos InfraRed Imager for Transits), an InGaAs CMOS detector on the Callisto telescope at the SPECULOOS Southern Observatory, during its first year of operation, from mid-2022 to 2023. We use 328 visits of 73 targets to optimise our CMOS-specific reduction process, including our approach to glow effects and bad-pixel handling. We find the measured precision to be consistent with our theoretical noise model, achieving sub-part-per-thousand precision under good observing conditions across targets spanning $J$-band magnitudes of 10--13. We further illustrate SPIRIT's capabilities with two case studies: a simultaneous SPIRIT $zYJ$ and CCD $I + z$ observation of a TRAPPIST-1\\,h transit, and monitoring observations of the fast-rotating dwarf LP~944-20. Our results confirm that InGaAs infrared CMOS detectors are a cost-effective and competitive technology for ground-based transit photometry of cool stars, and that they show promising prospects to become a core part of the next generation of instruments.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.19902",
  "author_total": 11,
  "authors": [
    {
      "name": "Clàudia Janó-Muñoz"
    },
    {
      "name": "Matthew J. Hooton"
    },
    {
      "name": "Peter P. Pedersen"
    },
    {
      "name": "Didier Queloz"
    },
    {
      "name": "Khalid Barkaoui"
    },
    {
      "name": "Yasmin T. Davis"
    },
    {
      "name": "Michaël Gillon"
    },
    {
      "name": "Benjamin V. Rackham"
    },
    {
      "name": "Mathilde Timmermans"
    },
    {
      "name": "Amaury H. M. J. Triaud"
    },
    {
      "name": "Sebastián Zúñiga-Fernández"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/85p52x154b803.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.19902",
  "fulltext_url": null,
  "id": "85p52x154b803",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.19902",
  "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.IM"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ],
    [
      "openalex",
      "3105|Astronomy and Astrophysical Research"
    ]
  ],
  "openalex": "W7222168517",
  "pdf_url": "https://arxiv.org/pdf/2610.19902",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/85p52x154b803.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:31Z",
      "native_id": "2610.19902",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.19902"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "On-sky performance and prospects of near-infrared CMOS detectors in exoplanet detection: first year of SPIRIT",
  "title_text": "On-sky performance and prospects of near-infrared CMOS detectors in exoplanet detection: first year of SPIRIT",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:31Z",
  "url": "https://research.draconitic.com/paper/85p52x154b803",
  "venue": "arXiv",
  "versions": []
}