Wavelength dependence of polarization of comet C/2000 WM1 (LINEAR) in the negative and positive polarization branches

Details Wavelength dependence of polarization of comet C/2000 WM1 (LINEAR) in the negative and positive polarization branches Wavelength dependence of polarization of comet C/2000 WM1 (LINEAR) in the negative and positive polarization branches

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..567j&link_type=abstract

In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed

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Comet C/2000 Wm1 (Linear), Polarimetry, Light Scattering, Dust

Scientific paper

Cometary dust particles are likely to be aggregates. Models of aggregate particles predict that, if the aggregates consist of monomers of a single size, the negative branch of polarization critically depends on the size parameter of the monomers. For a given aggregate, if the wavelength increaes (i.e. the size parameter decreases) the negative branch of polarization will gradually vanish. Similarly, if the imaginary part of the refractive index increases but all other quantities remain unchanged the phase curve of polarization becomes more positive. Again the negative branch of polarization is reduced and the inversion phase angle decreases. Polarization measurements of cometary dust indicate that, with exception of very few comets, the degree of polarization in the positive branch of polarization rises with wavelength but the negative branch of polarization remains almost unaffected. Polarimetric observations of dusty Comet C/2000 WM1 (LINEAR) were obtained from Nov. 10 to Dec. 9, 2001 with the 2m RCC Zeiss Telescope of Pik Terskol Observatory, when the phase angle of the comet varied between 13° and 62°, and the heliocentric distance between 1.6 and 1.1 AU. The observations confirm the above-mentioned wavelength dependence of color. They qualitatively agree with the theory if the absorption decreases with wavelength (as occurs in organic material). In this case the two effects, mentioned above, will partly compensate each other and therefore provide some stability for the inversion angle and, consequently, reduced dependence of the negative branch of polarization on wavelength.

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