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Water loss from terrestrial planets orbiting ultracool dwarfs: Implications for the planets of TRAPPIST-1

hal.structure.identifierNamur Center for Complex Systems [Namur] [NaXys]
dc.contributor.authorBOLMONT, Emeline
hal.structure.identifierECLIPSE 2016
dc.contributor.authorSELSIS, Franck
dc.contributor.authorOWEN, James E.
hal.structure.identifierDpto. de Organización de Empresas, Escuela Técnica Superior de Ingeniería Industrial de Barcelona
dc.contributor.authorRIBAS, Ignasi
hal.structure.identifierECLIPSE 2016
dc.contributor.authorRAYMOND, Sean N.
hal.structure.identifierECLIPSE 2016
dc.contributor.authorLECONTE, J.
hal.structure.identifierInstitut d'Astrophysique et de Géophysique [Liège]
dc.contributor.authorGILLON, Michael
dc.date.issued2016-10
dc.date.conference2016-10-16
dc.description.abstractEnUltracool dwarfs (UCDs) encompass the population of extremely low mass stars (later than M6-type) and brown dwarfs.Because UCDs cool monotonically, their habitable zone (HZ) sweeps inward in time.Assuming they possess water, planets found in the HZ of UCDs have experienced a runaway greenhouse phase too hot for liquid water prior to entering the HZ.It has been proposed that such planets are desiccated by this hot early phase and enter the HZ as dry, inhospitable worlds.Here we model the water loss during this pre-HZ hot phase taking into account recent upper limits on the XUV emission of UCDs and using 1D radiation-hydrodynamic simulations.We address the whole range of UCDs but also focus on the planets b, c and d recently found around the 0.08 M⊙ dwarf TRAPPIST-1.Despite assumptions maximizing the FUV-photolysis of water and the XUV-driven escape of hydrogen, we find that planets can retain significant amounts of water in the HZ of UCDs, with a sweet spot in the 0.04-0.06 M⊙ range.We also studied the TRAPPIST-1 system using observed constraints on the XUV-flux.We found that TRAPPIST-1b and c can lose as much as 15 Earth Ocean and planet d -- which may be inside the HZ depending on its actual period -- may have lost less than 1 Earth Ocean.Depending on its initial content, they could have enough water to remain habitable.TRAPPIST-1 planets are key targets for atmospheric characterization and could provide strong constraints on the water erosion around UCDs.
dc.language.isoen
dc.title.enWater loss from terrestrial planets orbiting ultracool dwarfs: Implications for the planets of TRAPPIST-1
dc.typeCommunication dans un congrès
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.conference.title2016DPS....4830208B - American Astronomical Society, DPS meeting #48, id.#302.08 held in Pasadena, California 16–21 October 2016
bordeaux.countryUS
bordeaux.conference.cityPasadena
bordeaux.peerReviewedoui
hal.identifierhal-01378919
hal.version1
hal.invitednon
hal.proceedingsnon
hal.conference.end2016-10-21
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01378919v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2016-10&rft.au=BOLMONT,%20Emeline&SELSIS,%20Franck&OWEN,%20James%20E.&RIBAS,%20Ignasi&RAYMOND,%20Sean%20N.&rft.genre=unknown


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