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September 5, 2026RAS Techniques and InstrumentsOpen Access

Detection of hydrocarbons in Titan using high-resolution cross-correlation spectroscopy

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Authors

MCMaria CoelhoRRRafael Rianço-SilvaDGDiogo Gonçalves

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Overview

Spectroscopic analysis uncovers ethane in Titan's atmosphere using cross-section templates, indicating a viable method for identifying uncataloged molecules in planetary atmospheres.

Key Points

  • To develop and validate a cross-section-based template methodology for high-resolution cross-correlation spectroscopy to identify atmospheric molecules lacking comprehensive high-resolution line lists.
  • Analyzed K-band CRIRES+ spectroscopic observations of Titan spanning 1.99 to 2.48 μm.
  • Computed cross-correlation functions using both conventional line-by-line and newly constructed cross-section-based molecular templates.
  • Recovered strong spectral signatures of known atmospheric hydrocarbons, specifically methane (CH4) and acetylene (C2H2).
  • Achieved the first high-resolution cross-correlation spectroscopy detection of ethane (C2H6) at a peak signal-to-noise ratio of SNRpeak = 5.17 ± 0.07, enabled exclusively by cross-section-based templates.

Cite This Study

Coelho et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd49d6b95aff0620ec63chttps://doi.org/10.1093/rasti/rzag068
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