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Dust and molecules in extra-galactic planetary nebulae

Published online by Cambridge University Press:  11 May 2017

D. A. García-Hernández
D. A. García-Hernández*
Affiliation:
Instituto de Astrofísica de Canarias, C/ Via Láctea s/n, E-38205 La Laguna, Spain email: agarcia@iac.es Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206 La Laguna, Spain
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Abstract

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Extra-galactic planetary nebulae (PNe) permit the study of dust and molecules in metallicity environments other than the Galaxy. Their known distances lower the number of free parameters in the observations vs. models comparison, providing strong constraints on the gas-phase and solid-state astrochemistry models. Observations of PNe in the Galaxy and other Local Group galaxies such as the Magellanic Clouds (MC) provide evidence that metallicity affects the production of dust as well as the formation of complex organic molecules and inorganic solid-state compounds in their circumstellar envelopes. In particular, the lower metallicity MC environments seem to be less favorable to dust production and the frequency of carbonaceous dust features and complex fullerene molecules is generally higher with decreasing metallicity. Here, I present an observational review of the dust and molecular content in extra-galactic PNe as compared to their higher metallicity Galactic counterparts. A special attention is given to the level of dust processing and the formation of complex organic molecules (e.g., polycyclic aromatic hydrocarbons, fullerenes, and graphene precursors) depending on metallicity.

Keywords

Astrochemistrymolecular processesPlanetary nebulaeAGB and post-AGBdust
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B , August 2015 , E5
Copyright
Copyright © International Astronomical Union 2017 

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