Dust Coma Simulations: Grains Fragmentation or Fading Grains?

Details Dust Coma Simulations: Grains Fragmentation or Fading Grains? Dust Coma Simulations: Grains Fragmentation or Fading Grains?

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.1717l&link_type=abstract

American Astronomical Society, DPS meeting #31, #17.17

Astronomy and Astrophysics

Astronomy

Scientific paper

Comet C/1996 Q1 (Tabur) was observed during Sept. 12-17, 1996 (r_h=1.2, Delta =0.75) shortly after its discovery. The investigation of the dust in the Sun-comet direction leads to evidence of fading grains in this comet. The continuum brightness profiles can be adequately fitted with a linear approach (m=1 in the log B-log rho representation) at projected distances from the nucleus (rho ) greater than 3500 km. However, at small distances, the linear fits for the Sunward profiles require slopes much higher than 1. Further analysis of the dust color firmly indicates the existence of a large change of color that can be interpreted by fading grains in this comet. The continuum brightness profiles in Sun and tail direction have been simulated by means of (i) a Fibson & Probstein model and (ii) a Montecarlo model. The model assumes different grain distribution and/or refractive index as a function of rho to reproduce the progressive fragmentation and/or ice sublimation of the grains.

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