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What is Polarized Light from Exoplanet HD 189733b about?

composition and size. Polarimetry, however, provides independent assessment. Here we report the 7.2σ discovery of linearly polarized, scattered light from the hot Jupiter HD 189733b in B band (390 to 475 nm) peaking near quarter phase with Δp=40.9±7.1 ppm. Polarization measurements, obtained with the POLISH2 polarimeter at both Gemini North and the Lick Observatory 3-m, are best explained by silicate (SiO2 or MgSiO3) particles with effective radius reff=0.038+0.047−0.023 μm (90% confidence).

Author

mfsterzik

Language

EN