A new analysis of the ESO Very Large Telescope (VLT) observations of Titan's at 2 µm.

Computer Science

Scientific paper

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Scientific paper

In this presentation, we report a new analysis of ESO Very Large Telescope (VLT) observations of Titan at about 2 m m, in the methane band and window. The VLT data consist in two north-south cuts of Titan's disk sampled with about twenty points each point being a spectrum. In this work, we essentially focus on the distribution of the airborn scatterers (e.g, haze aerosols, clouds, mist). In a first step, we compute the outgoing intensity using the prediction of the GCM database for the haze, and we compare the results with the VLT observations. These comparisons allow us to check the validity of the haze layers provided by the GCM database. In a second step, we modify the haze properties and we include a layer of bright scatterers in the troposphere (liquid droplets as observed by DISR) to improve the fit. This work yields a latitude-altitude map of Titan's haze and mist from the VLT data, and we estimate the impact of the haze and the mist layers on the surface albedo retrieval.

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