GRAIN PROPERTIES OF COMET C/1995 O1 (HALE-BOPP)
作者： David E. Harker , Diane H. Wooden , Charles E. Woodward , Carey M. Lisse
DOI: 10.1086/343091
关键词: Astrophysics 、 Physics 、 Amorphous solid 、 Particle-size distribution 、 Wavelength 、 Comet 、 Silicate 、 Infrared 、 Spectral energy distribution 、 Amorphous carbon
摘要: We present the analysis of 7.6-13.2 μm infrared (IR) spectrophotometry (R 250) comet C/1995 O1 (Hale-Bopp), in conjunction with concurrent observations that extend wavelength coverage spectral energy distribution from near- to far-infrared wavelengths. The include temporal epochs preperihelion (1996 October and 1997 February UT), near perihelion (1997 April postperihelion June UT). Through modeling thermal emission small, amorphous carbon grains crystalline silicate Hale-Bopp's coma, we find as approached perihelion, grain size (the Hanner modified power law) steepened (from N = 3.4 3.7 postperihelion), along an increase fractal porosity larger (greater than 1 μm) grains. peak remained constant (ap 0.2 at each epoch. attribute emergence 9.3 orthopyroxene released during high jet activity. Crystalline silicates (olivine orthopyroxene) make up about 30% (by mass) submicron-sized (≤1 dust coma
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