{
  "abstract": "The intrinsic properties of aerosols in Titan's atmosphere are one of the main sources of uncertainty when interpreting and understanding observations of its surface and atmosphere. The optical properties of the solid material have been recovered for both of Titan's aerosols using remote-sensing observations and laboratory analogs. Significant differences are observed in the refractive indices reported in the literature. For laboratory-generated solid analogs, these discrepancies in the refractive indices can originate from the different experimental factors influencing the morphological and chemical properties of solid samples, for example the energy distribution, gas flow rate, and/or gas temperature. In this study, we report new refractive indices, n and k, in the mid-infrared spectral range (2-20 µm) determined on Titan aerosol analogs with different morphological and chemical properties. We compare in detail the differences in optical properties of thin films, commonly used for refractive index measurements, and compressed pellets of quasispherical powders. Using transmission spectroscopy and reflection Mueller ellipsometry, we find that compressed powders are more absorbent than their film equivalent, with increased signature strengths of (hetero-)aromatic and amine features in agreement with a higher nitrogen-to-carbon ratio compared to the film analogs. Finally, we observe that the reflective power of these pellet analogs is not only affected by the refractive index (n) but also significantly by the inter-grain porosity.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 11,
  "authors": [
    {
      "name": "Zoé Perrin"
    },
    {
      "name": "Thomas Drant"
    },
    {
      "name": "Enrique Garcia Caurel"
    },
    {
      "name": "Jean‐blaise Brubach"
    },
    {
      "name": "Nathalie Ruscassier"
    },
    {
      "name": "Thomas Gautier"
    },
    {
      "name": "Ella Sciamma-O’brien"
    },
    {
      "name": "Ludovic Vettier"
    },
    {
      "name": "Audrey Chatain"
    },
    {
      "name": "Olivier Guaitella"
    },
    {
      "name": "Nathalie Carrasco"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/30wkf6r753ybr.bib",
  "cited_by": 0,
  "doi": "10.1051/0004-6361/202554328",
  "fulltext_url": null,
  "id": "30wkf6r753ybr",
  "issns": [
    "0004-6361",
    "1432-0746"
  ],
  "landing_url": "https://hal.science/hal-05769527v1",
  "language": "en",
  "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": [
    [
      "hal",
      "0.sdu"
    ],
    [
      "openalex",
      "3103|Astro and Planetary Science"
    ]
  ],
  "openalex": "W7171946659",
  "pdf_url": "https://hal.science/hal-05769527/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": "EDP Sciences",
  "ris": "https://research.draconitic.com/paper/30wkf6r753ybr.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:43Z",
      "native_id": "hal-05769527",
      "source": "hal",
      "url": "https://hal.science/hal-05769527v1"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Astro and Planetary Science",
      "subfield": "planetary"
    }
  ],
  "title": "Influence of chemical and morphological properties on the mid-infrared refractive indices of Titan aerosol analogs",
  "title_text": "Influence of chemical and morphological properties on the mid-infrared refractive indices of Titan aerosol analogs",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:43Z",
  "url": "https://research.draconitic.com/paper/30wkf6r753ybr",
  "venue": "Astronomy & Astrophysics - A&A",
  "versions": []
}