A grid of polarization models for Rayleigh scattering planetary atmospheres - Astrophysics > Earth and Planetary AstrophysicsReportar como inadecuado




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Abstract: We investigate the intensity and polarization of reflected light fromplanetary atmospheres. We present a large grid of Monte Carlo simulations forplanets with Rayleigh scattering atmospheres. We discuss the disk-integratedpolarization for phase angles typical of extrasolar planet observations and forthe limb polarization effect observable for solar system objects nearopposition. The main parameters investigated are single scattering albedo,optical depth of the scattering layer, and albedo of an underlying Lambertsurface for a homogeneous Rayleigh scattering atmosphere. We also investigateatmospheres with isotropic scattering and forward scattering aerosol particles,as well as models with two scattering layers.The model grid provides a tool for extracting quantitative results frompolarimetric measurements of planetary atmospheres from solar system planetsand extrasolar planets, in particular on the scattering properties andstratification of particles in the highest atmosphere layers.Spectropolarimetry of solar system planets offers complementary information tospectroscopy and polarization flux colors can be used for a firstcharacterization of exoplanet atmospheres. From limb polarization measurements,one can set constraints on the polarization at large phase angles.



Autor: Esther Buenzli, Hans Martin Schmid

Fuente: https://arxiv.org/







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