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

dc.contributor.authorTRIAUD, Amaury
dc.contributor.authorDE WIT, Julien
dc.contributor.authorKLEIN, Frieder
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
hal.structure.identifierInstitut Pierre-Simon-Laplace [IPSL (FR_636)]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorTURBET, Martin
dc.contributor.authorRACKHAM, Benjamin
dc.contributor.authorNIRAULA, Prajwal
dc.contributor.authorGLIDDEN, Ana
dc.contributor.authorJAGOUTZ, Oliver
dc.contributor.authorPEC, Matej
dc.contributor.authorPETKOWSKI, Janusz
dc.contributor.authorSEAGER, Sara
dc.contributor.authorSELSIS, Franck
dc.date.issued2023
dc.description.abstractEnThe conventional observables to identify a habitable or inhabited environment in exoplanets, such as an ocean glint or abundant atmospheric O$_2$, 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 substantial amount of liquid water, plate tectonic and/or biomass. We show that JWST can already perform such a search in some selected systems like TRAPPIST-1 via the CO$_2$ band at $4.3\,\rm μm$, which falls in a spectral sweet spot where the overall noise budget and the effect of cloud/hazes are optimal. We propose a 3-step strategy for transiting exoplanets: 1) detection of an atmosphere around temperate terrestrial planets in $\sim 10$ transits for the most favorable systems, (2) assessment of atmospheric carbon depletion in $\sim 40$ transits, (3) measurements of O$_3$ abundance to disentangle between a water- vs biomass-supported carbon depletion in $\sim100$ transits. The concept of carbon depletion as a signature for habitability is also applicable for next-generation direct imaging telescopes.
dc.language.isoen
dc.subject.enEarth and Planetary Astrophysics (astro-ph.EP)
dc.subject.enFOS: Physical sciences
dc.title.enAtmospheric carbon depletion as a tracer of water oceans and biomass on temperate terrestrial exoplanets
dc.typeDocument de travail - Pré-publication
dc.identifier.doi10.48550/arXiv.2310.14987
dc.subject.halPlanète et Univers [physics]
dc.identifier.arxiv2310.14987
hal.identifierhal-04263313
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04263313v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2023&rft.au=TRIAUD,%20Amaury&DE%20WIT,%20Julien&KLEIN,%20Frieder&TURBET,%20Martin&RACKHAM,%20Benjamin&rft.genre=preprint


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