Spectropolarimetry of the methane and ammonia bands of Jupiter between 6800 and 8200 A

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Atmospheric Composition, Jupiter Atmosphere, Polarimetry, Polarization, Spectroscopic Analysis, Aerosols, Ammonia, Atmospheric Temperature, Circular Polarization, Graphs (Charts), Jupiter (Planet), Methane, Methane, Ammonia, Jupiter, Wavelengths, Polarization, Scattering, Absorption Spectra, Aerosols, Observations, Spectropolarimeters, Spectrum, Atmosphere

Scientific paper

Spectropolarimetry of Jupiter at resolutions between 22 and 35 A reveals a strong increase of linear polarization in the 7250 A CH4 band. This is very probably due to the decreasing contribution toward the band center of the higher orders of scattering, which have a smaller net polarization than the first few orders. The linear polarization is also enhanced in the band at 7900 A comprising the 7920 A NH3 and 7600 to 8200 A CH4 bands. The normalized circular polarization shows a feature at 7250 A with a dispersion shape. This is most probably produced in a double-scattering process involving either a solid or liquid aerosol with an absorption at 7250 A. Methane aerosols, the obvious candidates from a spectroscopic point of view, are, however, forbidden if current estimates of the Jovian atmospheric temperature are correct.

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