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Chemical evolution in planet-forming regions. Impact on volatile abundances and C/O ratios of planet-building material

Published online by Cambridge University Press:  04 September 2018

Christian Eistrup ,
Catherine Walsh Open the ORCID record for Catherine Walsh [Opens in a new window]  and
Ewine F. van Dishoeck
Christian Eistrup
Affiliation:
Leiden Observatory, Niels Bohrweg 2, 2333RA Leiden, Netherlands email: eistrup@strw.leidenuniv.nl
Catherine Walsh
Affiliation:
Leiden Observatory, Niels Bohrweg 2, 2333RA Leiden, Netherlands email: eistrup@strw.leidenuniv.nl School of Physics and Astronomy, E C Stoner Building, University of Leeds, Leeds, UK
Ewine F. van Dishoeck
Affiliation:
Leiden Observatory, Niels Bohrweg 2, 2333RA Leiden, Netherlands email: eistrup@strw.leidenuniv.nl Max-Planck-Institut für extraterrestrische Physik, P.O. Box 1312, D-85741, Garching, Germany
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Abstract

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Connecting the observed composition of exoplanets to their formation sites often involves comparing the atmospheric C/O ratio to a disk midplane model with a fixed chemical composition. In this scenario chemistry during the planet formation era is not considered. However, kinetic chemical evolution during the lifetime of the gaseous disk can change the relative abundances of volatile species, thus altering the C/O ratios of planetary building blocks. In our chemical evolition models we utilize a large network of gas-phase, grain-surface and gas-grain interaction reactions, thus providing a comprehensive treatment of chemistry. The results show that, if sufficient ionisation is present, then chemistry does alter the C/O ratios of gas and ice during the epoch of planet(esimal) formation. This modifies the picture of C/O ratios in disk midplanes defined simply by volatile ice lines in a midplane of fixed chemical composition. Chemical evolution thus needs to be addressed when predicting the makeup of planets and their atmospheres.

Keywords

Protoplanetary disksPlanet formationKinetic chemistryChemical composition
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S332: Astrochemistry VII: Through the Cosmos from Galaxies to Planets , March 2017 , pp. 69 - 72
Copyright
Copyright © International Astronomical Union 2018 

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