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Using cold plasma to investigate the mechanisms involved in cosmic dust formation: Role of the C/O ratio and metals

Published online by Cambridge University Press:  12 October 2020

Rémi Bérard Open the ORCID record for Rémi Bérard [Opens in a new window] ,
Kremena Makasheva ,
Hassan Sabbah Open the ORCID record for Hassan Sabbah [Opens in a new window] ,
Karine Demyk  and
Christine Joblin
Rémi Bérard
Affiliation:
IRAP, Université de Toulouse, CNRS, UPS, CNES, 9 Av. du Colonel Roche, 31028 Toulouse Cedex 4, France LAPLACE, Université de Toulouse, CNRS, UPS, INPT, 118 route de Narbonne, Toulouse cedex 9, France
Kremena Makasheva
Affiliation:
LAPLACE, Université de Toulouse, CNRS, UPS, INPT, 118 route de Narbonne, Toulouse cedex 9, France
Hassan Sabbah
Affiliation:
IRAP, Université de Toulouse, CNRS, UPS, CNES, 9 Av. du Colonel Roche, 31028 Toulouse Cedex 4, France LCAR-IRSAMC, Université de Toulouse, UPS, CNRS, 118 route de Narbonne, Toulouse cedex 9, France
Karine Demyk
Affiliation:
IRAP, Université de Toulouse, CNRS, UPS, CNES, 9 Av. du Colonel Roche, 31028 Toulouse Cedex 4, France
Christine Joblin
Affiliation:
IRAP, Université de Toulouse, CNRS, UPS, CNES, 9 Av. du Colonel Roche, 31028 Toulouse Cedex 4, France
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Abstract

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Using a cold plasma reactor in which we inject an organosilicon molecular precursor, we investigate chemical mechanisms that can be involved in dust formation in evolved stars. By injecting metal atoms into the gas-phase, we investigate the role of metals on dust composition. We show the formation of composite particles made of pure metal (silver) nanoparticles embedded in an organosilicon dust. We study the impact of oxygen and show that it can inhibit dust formation, likely through the destruction of nucleation seeds.

Keywords

astrochemistryduststars: AGB and post-AGBmethods: laboratoryplasmas

References

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Sabbah, H. Bonnamy, A., Papanastasiou, D. Cernicharo, J. Martin-Gago, J.-A. & Joblin, C. 2017, ApJ, 843, 34Google Scholar