A Search for Minor Constituents on Titan and Jupiter

Astronomy and Astrophysics – Astronomy

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Scientific paper

Spectroscopy at resolving power R 1,000,000 of ethane (C2H6) lines in emission on Titan in the study of global winds, and Jupiter in the study of mid-infrared aurora, reveals spectral features that can not be identified using available ethane line atlases. Unidentified ethane lines or lines corresponding to other species overlapping the 12.2 μm ν9 ethane band may be present. Hydrocarbon species resulting from methane chemistry in these atmospheres such as, allene (C3H4), ethylene (C2H4), and propane (C3H8), all have bands overlapping this spectral region. The high resolving power of infrared heterodyne spectroscopy measurements resolves the overlapping spectral lines and permits identification of the parent molecules. Measurements with the NASA GSFC Heterodyne Instrument for Planetary Wind And Composition (HIPWAC) on the NASA IRTF and on the National Astronomical Observatory of Japan Subaru Telescope are analyzed for retrieval of spectral evidence for the presence of these candidate molecules. Laboratory spectral measurements of the candidate molecules at equal spectral resolution are used to help identify the spectral features in the remote data. Results of this study will be discussed as well as their implications for the retrieval of ethane and hydrocarbon abundances in the stratospheres of Titan, Jupiter and the outer planets.
This work was supported by the NASA Planetary Astronomy Program and is based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan, and data collected on the NASA Infrared Telescope Facility.

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