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Title: The Gaseous Phase as a Probe of the Astrophysical Solid Phase Chemistry

Abstract

In support of space missions and spectroscopic observations, laboratory experiments on ice analogs enable a better understanding of organic matter formation and evolution in astrophysical environments. Herein, we report the monitoring of the gaseous phase of processed astrophysical ice analogs to determine if the gaseous phase can elucidate the chemical mechanisms and dominant reaction pathways occurring in the solid ice subjected to vacuum ultra-violet (VUV) irradiation at low temperature and subsequently warmed. Simple (CH{sub 3}OH), binary (H{sub 2}O:CH{sub 3}OH, CH{sub 3}OH:NH{sub 3}), and ternary ice analogs (H{sub 2}O:CH{sub 3}OH:NH{sub 3}) were VUV-processed and warmed. The evolution of volatile organic compounds in the gaseous phase shows a direct link between their relative abundances in the gaseous phase, and the radical and thermal chemistries modifying the initial ice composition. The correlation between the gaseous and solid phases may play a crucial role in deciphering the organic composition of astrophysical objects. As an example, possible solid compositions of the comet Lovejoy are suggested using the abundances of organics in its comae.

Authors:
; ; ; ;  [1]
  1. Aix-Marseille Université, PIIM UMR-CNRS 7345, F-13397 Marseille (France)
Publication Date:
OSTI Identifier:
22679868
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 846; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMMONIA; ASTROPHYSICS; COMETS; CORRELATIONS; ELEMENT ABUNDANCE; FAR ULTRAVIOLET RADIATION; ICE; IRRADIATION; METHANOL; ORGANIC MATTER; RADICALS; REFRACTORIES; SPACE; STAR EVOLUTION; VOLATILITY; WATER

Citation Formats

Abou Mrad, Ninette, Duvernay, Fabrice, Isnard, Robin, Chiavassa, Thierry, and Danger, Grégoire, E-mail: gregoire.danger@univ-amu.fr. The Gaseous Phase as a Probe of the Astrophysical Solid Phase Chemistry. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA7CF0.
Abou Mrad, Ninette, Duvernay, Fabrice, Isnard, Robin, Chiavassa, Thierry, & Danger, Grégoire, E-mail: gregoire.danger@univ-amu.fr. The Gaseous Phase as a Probe of the Astrophysical Solid Phase Chemistry. United States. doi:10.3847/1538-4357/AA7CF0.
Abou Mrad, Ninette, Duvernay, Fabrice, Isnard, Robin, Chiavassa, Thierry, and Danger, Grégoire, E-mail: gregoire.danger@univ-amu.fr. Sun . "The Gaseous Phase as a Probe of the Astrophysical Solid Phase Chemistry". United States. doi:10.3847/1538-4357/AA7CF0.
@article{osti_22679868,
title = {The Gaseous Phase as a Probe of the Astrophysical Solid Phase Chemistry},
author = {Abou Mrad, Ninette and Duvernay, Fabrice and Isnard, Robin and Chiavassa, Thierry and Danger, Grégoire, E-mail: gregoire.danger@univ-amu.fr},
abstractNote = {In support of space missions and spectroscopic observations, laboratory experiments on ice analogs enable a better understanding of organic matter formation and evolution in astrophysical environments. Herein, we report the monitoring of the gaseous phase of processed astrophysical ice analogs to determine if the gaseous phase can elucidate the chemical mechanisms and dominant reaction pathways occurring in the solid ice subjected to vacuum ultra-violet (VUV) irradiation at low temperature and subsequently warmed. Simple (CH{sub 3}OH), binary (H{sub 2}O:CH{sub 3}OH, CH{sub 3}OH:NH{sub 3}), and ternary ice analogs (H{sub 2}O:CH{sub 3}OH:NH{sub 3}) were VUV-processed and warmed. The evolution of volatile organic compounds in the gaseous phase shows a direct link between their relative abundances in the gaseous phase, and the radical and thermal chemistries modifying the initial ice composition. The correlation between the gaseous and solid phases may play a crucial role in deciphering the organic composition of astrophysical objects. As an example, possible solid compositions of the comet Lovejoy are suggested using the abundances of organics in its comae.},
doi = {10.3847/1538-4357/AA7CF0},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 846,
place = {United States},
year = {2017},
month = {9}
}