The Formation of Crystalline Dust in AGB Winds from Binary Induced Spiral Shocks

Abstract

As stars evolve along the Asymptotic Giant Branch, strong winds are driven from the outer envelope. These winds form a shell, which may ultimately become a planetary nebula. Many planetary nebulae are highly asymmetric, hinting at the presence of a binary companion. Some post-Asymptotic Giant Branch objects are surrounded by torii of crystalline dust, but there is no generally accepted mechanism for annealing the amorphous grains in the wind to crystals. In this Letter, we show that the shaping of the wind by a binary companion is likely to lead to the formation of crystalline dust in the orbital plane of the binary.

Submitted to ApJL

References in corpus (10)

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• Keplerian discs around post-AGB stars: a common phenomenon?
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• Chemical Abundances and Dust in Planetary Nebulae in the Galactic Bulge
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• Reduction of the maximum mass-loss rate of OH/IR stars due to unnoticed binary interaction
• A dense disk of dust around the born-again Sakurai's object
• Herschel/PACS observations of the 69 $\mu m$ band of crystalline olivine around evolved stars
• Tracing the asymmetry in the envelope around the carbon star CIT 6
• Towards a Spectral Technique for Determining Material Geometry Around Evolved Stars: Application to HD 179821
• Multi-epoch Optical Images of IRC+10216 Tell About the Central Star And the Adjacent Environment
• The morpho-kinematical structure and chemical abundances of the complex planetary nebula NGC 1514