Information content of a planetary spectrum

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Atmospheric Models, Planetary Atmospheres, Spectral Line Width, Absorption Spectra, Atmospheric Attenuation, Atmospheric Scattering, Atmospheric Temperature, Pressure Broadening

Scientific paper

The information content of equivalent widths and line profiles is investigated when all of the pressure-broadened lines belong to a unique spectrum. The parameters which can be derived without a priori knowledge of the planetary atmosphere are emphasized. In general, the analysis of equivalent widths alone does not allow one to distinguish between different atmospheric models. A scattering indicator, which is a dimensionless number derived from the shape of line wings, is found to determine the influence of scattering in the absorption process.

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