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3D Global climate model of an exo-Venus: a modern Venus-like atmosphere for the nearby super-Earth LP 890-9 c

dc.contributor.authorQUIRINO, Diogo
dc.contributor.authorGILLI, Gabriella
dc.contributor.authorKALTENEGGER, Lisa
dc.contributor.authorNAVARRO, Thomas
dc.contributor.authorFAUCHEZ, Thomas J.
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorTURBET, Martin
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorLECONTE, Jérémy
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorLEBONNOIS, Sébastien
dc.contributor.authorGONZÁLEZ-GALINDO, Francisco
dc.date.issued2023
dc.identifier.issn1745-3933
dc.description.abstractEnThe recently discovered super-Earth LP 890-9 c is an intriguing target for atmospheric studies as it transits a nearby, low-activity late-type M-dwarf star at the inner edge of the Habitable Zone. Its position at the runaway greenhouse limit makes it a natural laboratory to study the climate evolution of hot rocky planets. We present the first 3D-Global Climate Model exo-Venus model for a modern Venus-like atmosphere (92 bar surface pressure, realistic composition, and H<SUB>2</SUB>SO<SUB>4</SUB> radiatively-active clouds), applied to the tidally-locked LP 890-9 c to inform observations by JWST and future instruments. If LP 890-9 c has developed into a modern exo-Venus, then the modelled temperatures suggest that H<SUB>2</SUB>SO<SUB>4</SUB> clouds are possible even in the substellar region. Like on modern Venus, clouds on LP 890-9 c would create a flat spectrum. The strongest CO<SUB>2</SUB> bands in transmission predicted by our model for LP 890-9 c are about 10 ppm, challenging detection, given JWST estimated noise floor. Estimated phase curve amplitudes are 0.9 and 2.4 ppm for continuum and CO<SUB>2</SUB> bands, respectively. While pointing out the challenge to characterise modern exo-Venus analogues, these results provide new insights for JWST proposals and highlight the influence of clouds in the spectrum of hot rocky exoplanet spectra.
dc.language.isoen
dc.publisherOxford Journals
dc.subject.enplanets and satellites: atmospheres
dc.subject.enplanets and satellites: terrestrial planets
dc.subject.enplanets and satellites: individual: LP 890-9 c
dc.title.en3D Global climate model of an exo-Venus: a modern Venus-like atmosphere for the nearby super-Earth LP 890-9 c
dc.typeArticle de revue
dc.identifier.doi10.1093/mnrasl/slad045
dc.subject.halPlanète et Univers [physics]
bordeaux.journalMonthly Notices of the Royal Astronomical Society: Letters
bordeaux.pageL86-L91
bordeaux.volume523
bordeaux.peerReviewedoui
hal.identifierinsu-04195497
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//insu-04195497v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Monthly%20Notices%20of%20the%20Royal%20Astronomical%20Society:%20Letters&amp;rft.date=2023&amp;rft.volume=523&amp;rft.spage=L86-L91&amp;rft.epage=L86-L91&amp;rft.eissn=1745-3933&amp;rft.issn=1745-3933&amp;rft.au=QUIRINO,%20Diogo&amp;GILLI,%20Gabriella&amp;KALTENEGGER,%20Lisa&amp;NAVARRO,%20Thomas&amp;FAUCHEZ,%20Thomas%20J.&amp;rft.genre=article


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