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- W2034307476 abstract "From a single, 3.8-hour observation of asteroid (4) Vesta at $13.7^circ$ phase angle with the POLISH2 polarimeter at the Lick Observatory Shane 3-m telescope, we confirm rotational modulation of linear polarization in $B$ and $V$ bands. We measure the peak-to-peak modulation in degree of linear polarization to be $Delta P = (294 pm 35) times 10^{-6}$ (ppm) and time-averaged $Delta P / P = 0.0577 pm 0.0069$. After rotating the plane of linear polarization to the scattering plane, asteroidal rotational modulation is detected with $12 sigma$ confidence and observed solely in Stokes $Q/I$. POLISH2 simultaneously measures Stokes $I$, $Q$, $U$ (linear polarization), and $V$ (circular polarization), but we detect no significant circular polarization with a $1 sigma$ upper limit of 140 ppm in $B$ band. Circular polarization is expected to arise from multiple scattering of sunlight by rough surfaces, and it has previously been detected in nearly all other classes of Solar System bodies save asteroids. Subsequent observations may be compared with surface albedo maps from the Dawn Mission, which may allow identification of compositional variation across the asteroidal surface. These results demonstrate the high accuracy achieved by POLISH2 at the Lick 3-m telescope, which is designed to directly detect scattered light from spatially unresolvable exoplanets." @default.
- W2034307476 created "2016-06-24" @default.
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- W2034307476 date "2015-02-02" @default.
- W2034307476 modified "2023-10-16" @default.
- W2034307476 title "SIMULTANEOUS LINEAR AND CIRCULAR OPTICAL POLARIMETRY OF ASTEROID (4) VESTA" @default.
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- W2034307476 doi "https://doi.org/10.1088/2041-8205/800/1/l1" @default.
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