Spectro-polarimetry of the two sides of Saturn's moon Iapetus

Physics

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Scientific paper

As a continuation of the previous measurement results [1], here we present linear polarimetric measurements of the two sides of Iapetus, that were carried out at ESO VLT using the FORS2 instrument, from 2009- 2011, at five different phase angles (see Table1), along with measurement of circular polarization of the bright side obtained at one observation epoch. Our measurements show that the absolute value of the degree of negative linear polarization of the bright hemisphere of Iapetus decreases with increasing phase angle, in the range 0.8 - 5.2 , varying from -0.9% to -0.3%. For the dark hemisphere, the polarimetric phase function behaves exactly the opposite, in the range 0.4 - 6.0 , reaching a minimum at around the end of the accessible phase angle range from the ground. The interpretation work for the observed polarization in terms of the physical mechanisms is underway, and is foreseen to yield grain parameters information on the light scattering of water ice and that of organic rich surfaces in the solar system.

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