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We report first multicolor polarimetric measurements (UBV bands) for the hotJupiters HD189733b and confirm our previously reported detection ofpolarization in the B band (Berdyugina et al. 2008). The wavelength dependenceof polarization indicates the dominance of Rayleigh scattering with a peak inthe blue B and U bands of ~10^-4+/-10^-5 and at least a factor of two lowersignal in the V band. The Rayleigh-like wavelength dependence, detected also inthe transmitted light during transits, implies a rapid decrease of thepolarization signal toward longer wavelengths. Therefore, the nondetection byWiktorowicz (2009), based on a measurement integrated within a broad passbandcovering the V band and partly B and R bands, is inconclusive and consistentwith our detection in B. We discuss possible sources of the polarization anddemonstrate that effects of incomplete cancellation of stellar limbpolarization due to starspots or tidal perturbations are negligible as comparedto scattering polarization in the planetary atmosphere. We compare theobservations with a Rayleigh-Lambert model and determine effective radii andgeometrical albedos for different wavelengths. We find a close similarity ofthe wavelength dependent geometrical albedo with that of the Neptuneatmosphere, which is known to be strongly influenced by Rayleigh and Ramanscattering. Our result establishes polarimetry as a reliable means for directlystudying exoplanetary atmospheres.

Polarized reflected light from the exoplanet HD189733b: First multicolor observations and confirmation of detection