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Insufficient evidence for DMS and DMDS in the atmosphere of K2-18 b: From a joint analysis of JWST NIRISS, NIRSpec, and MIRI observations — Astronomy & Astrophysics

Revision a7da202b-c6b8-4a45-8c3c-441a7ab1041b · 11/5/2026, 11:06:53 PM UTC
Key
luque2025k218b
Authors
Luque, R.; Piaulet-Ghorayeb, C.; Radica, M.; et al.
Issued
2025-8-27
Type
article-journal
Container
Astronomy & Astrophysics
Volume
700
Pages
A284
Raw CSL JSON
{
  "DOI": "10.1051/0004-6361/202555580",
  "URL": "https://www.aanda.org/articles/aa/full_html/2025/08/aa55580-25/aa55580-25.html",
  "page": "A284",
  "type": "article-journal",
  "title": "Insufficient evidence for DMS and DMDS in the atmosphere of K2-18 b: From a joint analysis of JWST NIRISS, NIRSpec, and MIRI observations",
  "author": [
    {
      "given": "R.",
      "family": "Luque"
    },
    {
      "given": "C.",
      "family": "Piaulet-Ghorayeb"
    },
    {
      "given": "M.",
      "family": "Radica"
    },
    {
      "literal": "et al."
    }
  ],
  "issued": {
    "date-parts": [
      [
        2025,
        8,
        27
      ]
    ]
  },
  "volume": "700",
  "accessed": {
    "date-parts": [
      [
        2026,
        11,
        6
      ]
    ]
  },
  "container-title": "Astronomy & Astrophysics"
}

Claims

  1. The first joint analysis of K2-18 b's full JWST spectrum (0.6–12 micrometres) finds insufficient evidence for DMS or DMDS. Marginal preferences come from limiting the molecules considered, and a range of photochemically plausible hydrocarbons can explain the data. About 25 more MIRI transits would be needed for a 3-sigma rejection of a flat spectrum.
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