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dc.contributor.authorBlumenthal, Sarah D.
dc.contributor.authorMandell, Avi M.
dc.contributor.authorHébrard, Eric
dc.contributor.authorBatalha, Natasha E.
dc.contributor.authorCubillos, Patricio E.
dc.contributor.authorRugheimer, Sarah
dc.contributor.authorWakeford, Hannah R.
dc.identifier.citationBlumenthal , S D , Mandell , A M , Hébrard , E , Batalha , N E , Cubillos , P E , Rugheimer , S & Wakeford , H R 2018 , ' A comparison of simulated JWST observations derived from equilibrium and non-equilibrium chemistry models of giant exoplanets ' , Astrophysical Journal , vol. 853 , no. 2 , 138 .
dc.identifier.otherPURE: 251868800
dc.identifier.otherPURE UUID: f2468e84-fb19-4542-9ba7-14f5e1955dde
dc.identifier.otherScopus: 85041814543
dc.identifier.otherORCID: /0000-0003-1620-7658/work/41547359
dc.identifier.otherWOS: 000423849000013
dc.descriptionSDB thanks NASA GSFC and UMBC for support of this work, and the University of Exeter for support through a Ph.D. studentship.en
dc.description.abstractWe aim to see if the difference between equilibrium and disequilibrium chemistry is observable in the atmospheres of transiting planets by the James Webb Space Telescope (JWST). We perform a case study comparing the dayside emission spectra of three planets like HD 189733b, WASP-80b, and GJ436b, in and out of chemical equilibrium at two metallicities each. These three planets were chosen because they span a large range of planetary masses and equilibrium temperatures, from hot and Jupiter-sized to warm and Neptune-sized. We link the one-dimensional disequilibrium chemistry model from Venot et al. (2012) in which thermochemical kinetics, vertical transport, and photochemistry are taken into account, to the one-dimensional, pseudo line-by-line radiative transfer model, Pyrat Bay, developed especially for hot Jupiters, and then simulate JWST spectra using PandExo for comparing the effects of temperature, metallicity, and radius. We find the most significant differences from 4 to 5 μm due to disequilibrium from CO and CO2 abundances, and also H2O for select cases. Our case study shows a certain "sweet spot" of planetary mass, temperature, and metallicity where the difference between equilibrium and disequilibrium is observable. For a planet similar to WASP-80b, JWST's NIRSpec G395M can detect differences due to disequilibrium chemistry with one eclipse event. For a planet similar to GJ 436b, the observability of differences due to disequilibrium chemistry is possible at low metallicity given five eclipse events, but not possible at the higher metallicity.
dc.relation.ispartofAstrophysical Journalen
dc.rights© 2018 The American Astronomical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. he final published version of this work is available at
dc.subjectPlanets and satellites: atmospheresen
dc.subjectPlanets and satellites: compositionen
dc.subjectPlanets and satellites: gaseous planetsen
dc.subjectQB Astronomyen
dc.titleA comparison of simulated JWST observations derived from equilibrium and non-equilibrium chemistry models of giant exoplanetsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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