Near-infrared views of dust in planetary nebulae: AKARI/IRC NIR spectral atlas of galactic PNe

R. Ohsawa, Takashi Onaka, I. Sakon, I. Yamamura, T. I. Mori, M. Matsuura & H. Kaneda

University of Tokyo, Japan

Dust is formed in the mass-loss wind of Asymptotic Giant Branch (AGB) stars and post-AGB stars. These evolved stars are thought to be major dust sources in galaxies. Investigation of dust in planetary nebulae (PNe), their successors, reveals the properties of dust grains injected into the interstellar medium. The near-infrared (2.5--5.0 micron) emission of PNe consists of hot dust continuum and emission bands of carbonaceous dust grains. This wave range, however, have not been well investigated due to the lack of instruments with a high sensitivity. We obtained 2.5--5.0 micron spectra of 72 Galactic PNe with the Infrared Camera onboard the AKARI satellite, which provides near-infrared spectroscopy with a sensitivity of a few mJy. The spectra and the intensities of emission features are compiled as a catalog. In this presentation, we introduce the catalog and discuss the properties of carbonaceous dust grains in Galactic PNe.

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