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Atmospheric carbon depletion as a tracer of water oceans and biomass on temperate terrestrial exoplanets

hal.structure.identifierSchool of Physics and Astronomy [Birmingham]
dc.contributor.authorTRIAUD, Amaury
hal.structure.identifierDepartment of Earth, Atmospheric and Planetary Sciences [MIT, Cambridge] [EAPS]
dc.contributor.authorDE WIT, Julien
hal.structure.identifierWoods Hole Oceanographic Institution [WHOI]
dc.contributor.authorKLEIN, Frieder
hal.structure.identifierDepartment of Earth, Atmospheric and Planetary Sciences [MIT, Cambridge] [EAPS]
dc.contributor.authorRACKHAM, Benjamin
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorTURBET, Martin
hal.structure.identifierDepartment of Atmospheric and Planetary Sciences [Hampton] [APS]
dc.contributor.authorNIRAULA, Prajwal
hal.structure.identifierDepartment of Earth, Atmospheric and Planetary Sciences [MIT, Cambridge] [EAPS]
dc.contributor.authorGLIDDEN, Ana
hal.structure.identifierDepartment of Earth, Atmospheric and Planetary Sciences [MIT, Cambridge] [EAPS]
dc.contributor.authorJAGOUTZ, Oliver
hal.structure.identifierDepartment of Earth, Atmospheric and Planetary Sciences [MIT, Cambridge] [EAPS]
dc.contributor.authorPEČ, Matej
hal.structure.identifierDepartment of Earth, Atmospheric and Planetary Sciences [MIT, Cambridge] [EAPS]
dc.contributor.authorPETKOWSKI, Janusz
hal.structure.identifierDepartment of Earth, Atmospheric and Planetary Sciences [MIT, Cambridge] [EAPS]
dc.contributor.authorSEAGER, Sara
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorSELSIS, Franck
dc.date.issued2024
dc.description.abstractEnThe conventional observables to identify a habitable or inhabited environment in exoplanets, such as an ocean glint or abundant atmospheric O2, will be challenging to detect with present or upcoming observatories. Here we suggest a new signature. A low carbon abundance in the atmosphere of a temperate rocky planet, relative to other planets of the same system, traces the presence of a substantial amount of liquid water, plate tectonics and/or biomass. Here we show that JWST can already perform such a search in some selected systems such as TRAPPIST-1 via the CO2 band at 4.3 μm, which falls in a spectral sweet spot where the overall noise budget and the effect of cloud and/or hazes are optimal. We propose a three-step strategy for transiting exoplanets: detection of an atmosphere around temperate terrestrial planets in about 10 transits for the most favourable systems; assessment of atmospheric carbon depletion in about 40 transits; and measurements of O3 abundance to disentangle between a water- versus biomass-supported carbon depletion in about 100 transits. The concept of carbon depletion as a signature for habitability is also applicable for next-generation direct-imaging telescopes
dc.language.isoen
dc.publisherNature Publishing Group
dc.title.enAtmospheric carbon depletion as a tracer of water oceans and biomass on temperate terrestrial exoplanets
dc.typeArticle de revue
dc.identifier.doi10.1038/s41550-023-02157-9
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPlanète et Univers [physics]/Océan, Atmosphère
dc.identifier.arxiv2310.14987
bordeaux.journalNature Astronomy
bordeaux.page17-29
bordeaux.volume8
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-04790253
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04790253v1
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