Polarimetry of grains in the coma of P/Halley. II - Interpretation

Details Polarimetry of grains in the coma of P/Halley. II - Interpretation Polarimetry of grains in the coma of P/Halley. II - Interpretation

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...213..469d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 213, no. 1-2, April 1989, p. 469-478.

Astronomy and Astrophysics

Astrophysics

33

Cometary Atmospheres, Halley'S Comet, Particle Size Distribution, Polarimetry, Giotto Mission, Interplanetary Dust, Meteoritic Composition, Poynting-Robertson Effect, Comets, Halley, Comae, Polarimetry, Grains, Physical Properties, Polarization, Aggregates, Parameters, Simulations, Optical Properties, Comparisons, Photomicrographs, Analysis, Chondritic Material, Description

Scientific paper

Physical properties of solid grains in the coma of P/Halley were derived on the basis of optical polarimetry data on the coma continuum obtained by Dollfus and Suchail (1987) and by an analysis of relevant polarization measurements recorded throughout the world. Results of polarimetry in the visible light indicate the presence of large particles, very rough and dark. These rather rough grains are mixed with the cloud of small particles analyzed with the spacecraft impact detectors. The presence of circular and deviated linear polarizations on some areas in the coma indicates elongated grains oriented by gas streams or jets, either in the population of small particles or among the large flakes. It is speculated that the source of the Brownlee particles and of the large grains assumed to produce the zodiacal light are the large cometary fluffy aggregates which are identified by polarimetry, after transportation inward in the solar system by the Poynting-Robertson effect.

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