Diagnostic capacities of circular polarization in investigating the surfaces of atmosphereless celestial bodies

Details Diagnostic capacities of circular polarization in investigating the surfaces of atmosphereless celestial bodies Diagnostic capacities of circular polarization in investigating the surfaces of atmosphereless celestial bodies

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sval...18..113d&link_type=abstract

Soviet Astronomy Letters, Vol. 18, p. 113; Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 18, no. 3, March 1992, p. 27

Astronomy and Astrophysics

Astronomy

1

Astronomical Polarimetry, Celestial Bodies, Circular Polarization, Cosmic Dust, Dielectrics, Light Scattering, Powder (Particles)

Scientific paper

Phase dependences for the circular polarization of light scattered by surfaces formed by a layer of tiny particles were obtained with the high-precision Stokes polarimeter. Transparent dielectric particles, the same particles but coated with metal (nickel), and metallic particles were investigated. The particles had similar dimensions (about 50 microns) but different shapes. The measurements showed that, irrespective of particle form, the circular polarization of light scattered by surfaces formed by particles with a small absorption index (dielectric), is zero, while for strongly absorbing particles (metallic or metallized), it has values which are significantly different from zero and which are especially high (up to 3 percent) at large phase angles. Therefore, measurements of the circular polarization of light scattered by the surfaces of atmosphereless celestial bodies can be used to detect metals in their surface layer, which, in particular, can be used to clarify the nature of M-asteroids.

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