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Chemistry on hot astrochemical dust surfaces: Sulfur in AGB outflows

Published online by Cambridge University Press:  30 November 2022

Amy Wolstenholme-Hogg ,
Alexander D. James Open the ORCID record for Alexander D. James [Opens in a new window] ,
John M. C. Plane  and
Marie Van de Sande Open the ORCID record for Marie Van de Sande [Opens in a new window]
Amy Wolstenholme-Hogg
Affiliation:
School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom email: A.James1@leeds.ac.uk
Alexander D. James
Affiliation:
School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom email: A.James1@leeds.ac.uk
John M. C. Plane
Affiliation:
School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom email: A.James1@leeds.ac.uk
Marie Van de Sande
Affiliation:
School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, United Kingdom
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Abstract

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Astrochemical models treat dust surfaces as ice covered. We investigate the effects of implementing increased bare dust binding energies of CO and S-bearing species on the chemistry in the outflows of asymptotic giant branch (AGB) stars. We demonstrate the potential for improving agreement with observations in the outflow of IK Tau.

Increasing the binding energies to measured and computationally derived values in high mass-loss AGB outflows increased the production of daughter species. Switching from a high binding energy on bare dust to weaker binding to ice, the gas phase abundance increased at a radius in agreement with observations of IK Tau, suggesting that displacement of bound species could contribute to this observational puzzle. Using a strong binding to bare dust, a gas phase increase was not observed, however parent species concentrations had to be increased by around a factor of four to explain observed concentrations.

Keywords

Surface BindingKineticsAGB OutflowsSulfur
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S366: The Origin of Outflows in Evolved Stars , November 2020 , pp. 271 - 276
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of International Astronomical Union

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