The impact of UV photons from a stellar companion on the chemistry of AGB outflows

M. Van de Sande; T. J. Millar

doi:10.1017/S1743921322000138

The impact of UV photons from a stellar companion on the chemistry of AGB outflows

M. Van de Sande, T. J. Millar

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Abstract

Binary interaction with a stellar or planetary companion has been proposed to be the driving mechanism behind large-scale asymmetries, such as spirals and disks, observed within AGB outflows. We developed the first chemical kinetics model that takes the effect of a stellar companions's UV radiation into account. The presence of a stellar companion can initiate a rich photochemistry in the inner wind. Its impact is determined by the intensity of the UV radiation and the extinction the radiation experiences. The outcome of the inner wind photochemistry depends on the balance between two-body reactions and photoreactions. If photoreactions dominate, the outflow can appear molecule-poor. If two-body reactions dominate, chemical complexity within the outflow can increase, yielding daughter species with a large inner wind abundance. A comprehensive view on the molecular content of the outflow, especially combined with abundance profiles, can point towards the presence of a stellar companion.

Original language	English
Pages (from-to)	265-270
Number of pages	6
Journal	Proceedings of the International Astronomical Union
Volume	16
Issue number	Symposium S366 - November 2020
DOIs	https://doi.org/10.1017/S1743921322000138
Publication status	Published - 06 Nov 2022

Bibliographical note

Funding Information:
MVdS acknowledges support from the Research Foundation Flanders (FWO) through grant 12X6419N and the European Union's Horizon 2020 research and innovation pro-gramme under the Marie Skłodowska-Curie grant agreement No 882991. TJM gratefully acknowledges the receipt of a Leverhulme Emeritus Fellowship and the STFC for support under grant reference ST/P000312/1 and ST/T000198/1.

Publisher Copyright:
© The Author(s), 2022. Published by Cambridge University Press on behalf of International Astronomical Union.

Keywords

astrochemistry
circumstellar matter
molecular processes
Stars: AGB and post-AGB

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1017/S1743921322000138Licence: CC BY

The impact of UV photons from a stellar companion on the chemistry of AGB outflows
Copyright 2022 the authors. This is an open access article published under a Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Final published version, 673 KBLicence: CC BY

Cite this

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title = "The impact of UV photons from a stellar companion on the chemistry of AGB outflows",

abstract = "Binary interaction with a stellar or planetary companion has been proposed to be the driving mechanism behind large-scale asymmetries, such as spirals and disks, observed within AGB outflows. We developed the first chemical kinetics model that takes the effect of a stellar companions's UV radiation into account. The presence of a stellar companion can initiate a rich photochemistry in the inner wind. Its impact is determined by the intensity of the UV radiation and the extinction the radiation experiences. The outcome of the inner wind photochemistry depends on the balance between two-body reactions and photoreactions. If photoreactions dominate, the outflow can appear molecule-poor. If two-body reactions dominate, chemical complexity within the outflow can increase, yielding daughter species with a large inner wind abundance. A comprehensive view on the molecular content of the outflow, especially combined with abundance profiles, can point towards the presence of a stellar companion.",

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AB - Binary interaction with a stellar or planetary companion has been proposed to be the driving mechanism behind large-scale asymmetries, such as spirals and disks, observed within AGB outflows. We developed the first chemical kinetics model that takes the effect of a stellar companions's UV radiation into account. The presence of a stellar companion can initiate a rich photochemistry in the inner wind. Its impact is determined by the intensity of the UV radiation and the extinction the radiation experiences. The outcome of the inner wind photochemistry depends on the balance between two-body reactions and photoreactions. If photoreactions dominate, the outflow can appear molecule-poor. If two-body reactions dominate, chemical complexity within the outflow can increase, yielding daughter species with a large inner wind abundance. A comprehensive view on the molecular content of the outflow, especially combined with abundance profiles, can point towards the presence of a stellar companion.

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JO - Proceedings of the International Astronomical Union

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ER -

The impact of UV photons from a stellar companion on the chemistry of AGB outflows

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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