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Paper: Center-to-Limb Continuum Polarization in Solar and Stellar Atmospheres
Volume: 526, Solar Polarization Workshop 8
Page: 139
Authors: Kostogryz, N. M.; Berdyugina, S. V.; Yakobchuk, T. M.; Milić, I.
Abstract: The center-to-limb variation of the intensity (CLVI) and of the linear polarization (CLVP) of stellar radiation arise when the scattering and absorption processes are important in the stellar atmosphere. We model the CLVI and CLVP of continuum radiation, taking into account different contributions of scattering and absorption opacity for a variety of spectral type stars with plane-parallel and spherical PHOENIX atmosphere models. We show how the polarization depends on the effective temperature and surface gravity of a star and how the considered geometry of the stellar atmosphere affects the polarization signal. For the Sun, we compare existing measurements with our theoretical predictions for different solar models (FALA, FALC, FALP, HSRA, and Phoenix). The CLVI and CLVP of stellar atmospheres are also needed to interpret the light curves of transiting exoplanets. Here we present the variation of the polarization in exoplanetary systems caused by transits and grazing transits and discuss how the considered geometry of stellar atmosphere models affect the transit curves of exoplanets.
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