Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.1707k&link_type=abstract
American Astronomical Society, DPS meeting #38, #17.07; Bulletin of the American Astronomical Society, Vol. 38, p.513
Other
Scientific paper
Our results are based on the observations performed 17 hours after the Deep Impact at ESO La Silla with NTT using EMMI (visible spectral region), and SOFI (near-IR region). To study the dust component we used the ultraviolet (Uc), blue (Bc) and red (Rc) continuum filters. Observations with SOFI in the near-IR were performed with the regular J, H, and Ks broad band filters, which are also free of gas contamination. We made scans through the images in the ejecta-antiejecta direction and calculated the colors to see differences in physical properties of the dust in the regular coma and in the ejecta cloud and their evolution with the distance from the nucleus. To extract the properties of the dust, we applied a technique described in Kolokolova et al. (Icarus, 153, 197, 2001) that enables to reveal the size distribution of the dust and the optical properties of its material if values of five continuum colors are available. For the ejecta we did not have data in Uc and Bc filter, thus, we were limited by three colors and could obtain only the data on the size distribution of the dust particles. For the regular coma the power of the power-law size distribution was equal a = 2.63 and the minimum size of the particles was equal Rmin = 0.19 micron that is rather close to the values we earlier obtained for other comets (see, e.g. Kolokolova et al., Icarus, 126, 351, 1996). The size distribution of the impact ejecta was very different and characterized by a = 1.8-2.1 and Rmin 1 micron. It is consistent with the results obtained from the in-situ data, which indicate that Deep Impact dust was dominated by few-micron sized particles.
ESO DI Dust Team
Kolokolova Ludmilla
Pompei Emanuela
Tozzi Gianpaolo
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