Longitudinally asymmetric stratospheric oscillation on a tidally locked exoplanet
dc.contributor.author | Cohen, M | |
dc.contributor.author | Bollasina, MA | |
dc.contributor.author | Palmer, PI | |
dc.contributor.author | Sergeev, DE | |
dc.contributor.author | Boutle, IA | |
dc.contributor.author | Mayne, NJ | |
dc.contributor.author | Manners, J | |
dc.date.accessioned | 2022-03-29T09:54:49Z | |
dc.date.issued | 2022-05-13 | |
dc.date.updated | 2022-03-28T17:11:46Z | |
dc.description.abstract | Using a three-dimensional general circulation model, we show that the atmospheric dynamics on a tidally locked Earth-like exoplanet, simulated with the planetary and orbital parameters of Proxima Centauri b, support a longitudinally asymmetric stratospheric wind oscillation (LASO), analogous to Earth’s quasi-biennial oscillation (QBO). In our simulations, the LASO has a vertical extent of 3555 km, a period of 5–6.5 months, and a peak-to-peak wind speed amplitude of-70 to +130 ms−1 with a maximum at an altitude of 41 km. Unlike the QBO, the LASO displays longitudinal asymmetries related to the asymmetric thermal forcing of the planet and to interactions with the resulting stationary Rossby waves. The equatorial gravity wave sources driving the LASO are localised in the deep convection region at the substellar point and in a jet exit region near the western terminator, unlike the QBO, for which these sources are distributed uniformly around the planet. Longitudinally, the western terminator experiences the highest wind speeds and undergoes reversals earlier than other longitudes. The antistellar point only experiences a weak oscillation with a very brief, low-speed westward phase. The QBO on Earth is associated with fluctuations in the abundances of water vapour and trace gases such as ozone which are also likely to occur on exoplanets if these gases are present. Strong fluctuations in temperature and the abundances of atmospheric species at the terminators will need to be considered when interpreting atmospheric observations of tidally locked exoplanets. | en_GB |
dc.description.sponsorship | Natural Environment Research Council (NERC) | en_GB |
dc.description.sponsorship | Leverhulme Trust | en_GB |
dc.description.sponsorship | Science and Technology Facilities Council (STFC) | en_GB |
dc.description.sponsorship | UKRI | en_GB |
dc.description.sponsorship | Met Office | en_GB |
dc.identifier.citation | Vol. 930 (2), article 152 | en_GB |
dc.identifier.doi | 10.3847/1538-4357/ac625d | |
dc.identifier.grantnumber | NE/S007407/1 | en_GB |
dc.identifier.grantnumber | RPG-2020-82 | en_GB |
dc.identifier.grantnumber | ST/R000395/1 | en_GB |
dc.identifier.grantnumber | MR/T040866/1 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/129192 | |
dc.identifier | ORCID: 0000-0001-6707-4563 (Mayne, Nathan) | |
dc.language.iso | en | en_GB |
dc.publisher | American Astronomical Society / IOP Publishing | en_GB |
dc.rights | © 2022. The Author(s). Published by the American Astronomical Society. Open access. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. | |
dc.subject | exoplanets | en_GB |
dc.subject | exoplanet atmospheres | en_GB |
dc.title | Longitudinally asymmetric stratospheric oscillation on a tidally locked exoplanet | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2022-03-29T09:54:49Z | |
dc.identifier.issn | 0004-637X | |
dc.description | This is the final version. Available on open access from IOP Publishing via the DOI in this record | en_GB |
dc.identifier.journal | Astrophysical Journal | en_GB |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_GB |
dcterms.dateAccepted | 2022-03-28 | |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2022-03-28 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2022-03-29T09:25:16Z | |
refterms.versionFCD | AM | |
refterms.dateFOA | 2022-06-14T12:53:16Z | |
refterms.panel | B | en_GB |
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Except where otherwise noted, this item's licence is described as © 2022. The Author(s). Published by the American Astronomical Society. Open access. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.