Mid-Infrared Spectrum of the Zodiacal Light Observed with AKARI/IRC

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present three spectra of the zodiacal light observed in mid-infrared wavelength region with Infrared Camera (IRC) on board AKARI. The IRC spectra (5.5-12.5 μm) show an excess emission feature in 9-11 μm which can be reasonably accounted for by a combination of amorphous and crystalline silicate. The IRC observation suggests the presence of crystalline silicate features (9.3 and 11.35 μm) in the zodiacal light spectrum, indicating that pyroxene-rich anhydrous chondritic porous interplanetary dust particle-like dust may be one of major sources for the small (<10 μm) interplanetary dust particles.

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