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The habitability of Proxima Centauri b. I. Irradiation, rotation and volatile inventory from formation to the present

hal.structure.identifierInstitut de Ciencies de l'Espai [Barcelona] [ICE-CSIC]
dc.contributor.authorRIBAS, Ignasi
hal.structure.identifierNamur Center for Complex Systems [Namur] [NaXys]
dc.contributor.authorBOLMONT, Emeline
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorSELSIS, Franck
hal.structure.identifierInstitut für Astrophysik [Göttingen]
dc.contributor.authorREINERS, Ansgar
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorLECONTE, J.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorRAYMOND, Sean N.
hal.structure.identifierDepartment of Astrophysics and Planetary Science [Villanova]
dc.contributor.authorENGLE, Scott G.
dc.contributor.authorGUINAN, Edward F.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorMORIN, Julien
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorTURBET, Martin
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorFORGET, François
hal.structure.identifierSchool of Physics and Astronomy [London]
dc.contributor.authorANGLADA-ESCUDE, Guillem
dc.date.created2016-08-24
dc.date.issued2016-12
dc.identifier.issn0004-6361
dc.description.abstractEnProxima b is a planet with a minimum mass of 1.3 MEarth orbiting within the habitable zone (HZ) of Proxima Centauri, a very low-mass, active star and the Sun's closest neighbor. Here we investigate a number of factors related to the potential habitability of Proxima b and its ability to maintain liquid water on its surface. We set the stage by estimating the current high-energy irradiance of the planet and show that the planet currently receives 30 times more EUV radiation than Earth and 250 times more X-rays. We compute the time evolution of the star's spectrum, which is essential for modeling the flux received over Proxima b's lifetime. We also show that Proxima b's obliquity is likely null and its spin is either synchronous or in a 3:2 spin-orbit resonance, depending on the planet's eccentricity and level of triaxiality. Next we consider the evolution of Proxima b's water inventory. We use our spectral energy distribution to compute the hydrogen loss from the planet with an improved energy-limited escape formalism. Despite the high level of stellar activity we find that Proxima b is likely to have lost less than an Earth ocean's worth of hydrogen before it reached the HZ 100-200 Myr after its formation. The largest uncertainty in our work is the initial water budget, which is not constrained by planet formation models. We conclude that Proxima b is a viable candidate habitable planet.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrophysics - Earth and Planetary Astrophysics
dc.subject.enplanets and satellites: individual: Proxima b
dc.subject.enAstrophysics - Solar and Stellar Astrophysics
dc.subject.enstars: individual: Proxima Cen
dc.subject.enplanet-star interactions
dc.subject.enX-rays: stars
dc.subject.enplanets and satellites: atmospheres
dc.title.enThe habitability of Proxima Centauri b. I. Irradiation, rotation and volatile inventory from formation to the present
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201629576
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.identifier.arxiv1608.06813
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA111
bordeaux.volume596
bordeaux.peerReviewedoui
hal.identifierhal-01359526
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01359526v1
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