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Synthesis of solid-state complex organic molecules through accretion of simple species at low temperatures

Published online by Cambridge University Press:  12 October 2020

D. Qasim
Affiliation:
Laboratory for Astrophysics, Leiden Observatory, Leiden University, PO Box 9513, NL–2300 RA Leiden, the Netherlands email: dqasim@strw.leidenuniv.nl
G. Fedoseev
Affiliation:
INAF–Osservatorio Astrofisico di Catania, via Santa Sofia 78, 95123 Catania, Italy
K.-J. Chuang
Affiliation:
Laboratory for Astrophysics, Leiden Observatory, Leiden University, PO Box 9513, NL–2300 RA Leiden, the Netherlands email: dqasim@strw.leidenuniv.nl Leiden Observatory, Leiden University, PO Box 9513, NL–2300 RA Leiden, the Netherlands
V. Taquet
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Florence, Italy
T. Lamberts
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Florence, Italy
J. He
Affiliation:
Laboratory for Astrophysics, Leiden Observatory, Leiden University, PO Box 9513, NL–2300 RA Leiden, the Netherlands email: dqasim@strw.leidenuniv.nl
S. Ioppolo
Affiliation:
School of Electronic Engineering and Computer Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK
E. F. van Dishoeck
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513, NL–2300 RA Leiden, the Netherlands
H. Linnartz
Affiliation:
Laboratory for Astrophysics, Leiden Observatory, Leiden University, PO Box 9513, NL–2300 RA Leiden, the Netherlands email: dqasim@strw.leidenuniv.nl
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Abstract

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Complex organic molecules (COMs) have been detected in the gas-phase in cold and lightless molecular cores. Recent solid-state laboratory experiments have provided strong evidence that COMs can be formed on icy grains through ‘non-energetic’ processes. In this contribution, we show that propanal and 1-propanol can be formed in this way at the low temperature of 10 K. Propanal has already been detected in space. 1-propanol is an astrobiologically relevant molecule, as it is a primary alcohol, and has not been astronomically detected. Propanal is the major product formed in the C2H2 + CO + H experiment, and 1-propanol is detected in the subsequent propanal + H experiment. ALMA observations towards IRAS 16293-2422B are discussed and provide a 1-propanol:propanal upper limit of < 0.35–0.55, which are complemented by computationally-derived activation barriers in addition to the performed laboratory experiments.

Type
Contributed Papers
Copyright
© International Astronomical Union 2020

Footnotes

Present address: Laboratory Astrophysics Group of the Max Planck Institute for Astronomy at the Friedrich Schiller University Jena, Institute of Solid State Physics, Helmholtzweg 3, D-07743 Jena, Germany

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