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Gas-dust chemistry of volatiles in the star and planetary system formation

Published online by Cambridge University Press:  12 October 2020

Yuri Aikawa Open the ORCID record for Yuri Aikawa [Opens in a new window]  and
Kenji Furuya
Yuri Aikawa
Affiliation:
Department of Astronomy, The University of Tokyo, 113-0033, Tokyo, Japan email: [email protected]
Kenji Furuya
Affiliation:
Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 Japan, email: [email protected]
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Abstract

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The focus of this work is on two topics: (i) formation of complex organic molecules (COMs) and (ii) isotope fractionation. Various COMs, which are C, H-containing molecules consisting of 6 atoms and more, have been detected in the central warm region of protostellar cores. Most of this review is about gas-grain chemical models, which have been constructed to evaluate the mechanisms and efficiency of the COM formation. The relevant physical and chemical processes are investigated in laboratory experiments, as reported in other articles in this volume.

The isotope fractionation of volatile elements is observed in both the interstellar medium (ISM) and Solar system material. While exothermic exchange reactions enrich molecules with heavier isotopes such as Deuterium, the isotope selective photodissociation can be coupled with ice formation to enrich the ice mantle with rare isotopes. The efficiency of this fractionation depends on the photodesorption yields, which has been studied in laboratory experiments.

Keywords

interstellar matterastrochemistrystar-formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S350: Laboratory Astrophysics: From Observations to Interpretation , April 2019 , pp. 161 - 168
Copyright
© International Astronomical Union 2020

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