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We present the results of AKARI observations of the O-rich supernova remnantG292.0+1.8 using six IRC and four FIS bands covering 2.7-26.5 um and 50-180 um,respectively. The AKARI images show two prominent structures; a brightequatorial ring structure and an outer elliptical shell structure. Theequatorial ring structure is clumpy and incomplete with its western end opened.The outer shell is almost complete and slightly squeezed along the north-southdirection. The central position of the outer shell is ~ 1' northwest from theembedded pulsar and coincides with the center of the equatorial ring structure.The equatorial ring and the elliptical shell structures were partly visible inoptical and/or X-rays, but they are much more clearly revealed in our AKARIimages. There is no evident difference in infrared colors of the two prominentstructures, which is consistent with the previous proposition that bothstructures are of circumstellar origin. However, we have detected faintinfrared emission of a considerably high 15 to 24 um ratio associated with thesupernova ejecta in the southeastern and northwestern areas. Our IRC spectrashow that the high ratio is at least partly due to the emission lines from Neions in the supernova ejecta material. In addition we detect a narrow,elongated feature outside the SNR shell. We derive the physical parameters ofthe infrared-emitting dust grains in the shocked circumstellar medium andcompare the result with model calculations of dust destruction by a SN shock.The AKARI results suggest that the progenitor was at the center of the infraredcircumstellar shell in red supergiant stage and that the observed asymmetry inthe SN ejecta could be a result of either a dense circumstellar medium in theequatorial plane and/or an asymmetric explosion.

AKARI Infrared Observations of the Supernova Remnant G292.0+1.8: Unveiling Circumstellar Medium and Supernova Ejecta