Walsh, C orcid.org/0000-0001-6078-786X (2015) Chemical complexity in protoplanetary disks in the era of ALMA and Rosetta. In: Simon, R, Schaaf, R and Stutzki, J, (eds.) EAS Publications Series. Conditions and Impact of Star Formation, 07 Sep 2015 - 11 Nov 2016, Zermatt, Switzerland. EDP Sciences , pp. 315-320. ISBN 978-2-7598-2022-1
Abstract
Comets provide a unique insight into the molecular composition and complexity of the material in the primordial solar nebula. Recent results from the Rosetta mission, currently monitoring comet 67P/Churyumov-Gerasimenko in situ, and ALMA (the Atacama Large Millimeter/submillimeter Array) have demonstrated a tantalising link between the chemical complexity now confirmed in disks (via the detection of gas-phase cf.CH3CN Öberg et al. [13]) and that confirmed on the surface of 67P (Goesmann et al. [3]), raising questions concerning the chemical origin of such species (cloud or inheritance versus disk synthesis). Results from an astrochemical model of a protoplanetary disk are presented in which complex chemistry is included and in which it is assumed that simple ices only are inherited from the parent molecular cloud. The model results show good agreement with the abundances of several COMs observed on the surface of 67P with Philae/COSAC. Cosmic-ray and X-ray-induced photoprocessing of predominantly simple ices inherited by the protoplanetary disk is sufficient to generate a chemical complexity similar to that observed in comets. This indicates that the icy COMs detected on the surface of 67P may have a disk origin. The results also show that gas-phase cf.CH3CN is abundant in the inner warm disk atmosphere where hot gas-phase chemistry dominates and potentially erases the ice chemical signature. Hence, cf.CH3CN may not be an unambiguous tracer of the complex organic ice reservoir. However, a better understanding of the hot gas-phase chemistry of cf.CH3CN is needed to confirm this preliminary conclusion.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: | |
Editors: |
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Copyright, Publisher and Additional Information: | © 2016 EDP Sciences. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Protoplanetary disks; Comets; Astrochemistry |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 08 Nov 2016 14:50 |
Last Modified: | 08 Nov 2016 14:50 |
Published Version: | https://doi.org/10.1051/eas/1575063 |
Status: | Published |
Publisher: | EDP Sciences |
Identification Number: | 10.1051/eas/1575063 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:107106 |