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Atmospheric reconnaissance of the habitable-zone Earth-sized planets orbiting TRAPPIST-1

hal.structure.identifierDepartment of Earth, Atmospheric and Planetary Sciences [MIT, Cambridge] [EAPS]
dc.contributor.authorDE WIT, Julien
hal.structure.identifierUniversity of Exeter
hal.structure.identifierSpace Telescope Science Institute [STSci]
dc.contributor.authorWAKEFORD, Hannah
hal.structure.identifierSpace Telescope Science Institute [STSci]
dc.contributor.authorLEWIS, Nikole
hal.structure.identifierCavendish Laboratory
dc.contributor.authorDELREZ, Laetitia
hal.structure.identifierSpace Sciences, Technologies and Astrophysics Research Institute [STAR]
dc.contributor.authorGILLON, Michael
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierECLIPSE 2018
dc.contributor.authorSELSIS, Franck
hal.structure.identifierECLIPSE 2018
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorLECONTE, J.
hal.structure.identifierCenter for Space and Habitability [CSH]
dc.contributor.authorDEMORY, Brice-Olivier
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorBOLMONT, Emeline
hal.structure.identifierObservatoire Astronomique de l'Université de Genève [ObsGE]
dc.contributor.authorBOURRIER, Vincent
hal.structure.identifierCenter for Astrophysics and Space Sciences [La Jolla] [CASS]
dc.contributor.authorBURGASSER, Adam
hal.structure.identifierCenter for Space and Habitability [CSH]
dc.contributor.authorGRIMM, Simon
hal.structure.identifierSpace Sciences, Technologies and Astrophysics Research Institute [STAR]
dc.contributor.authorJEHIN, Emmanuel
hal.structure.identifierNASA Johnson Space Center [JSC]
dc.contributor.authorLEDERER, Susan
hal.structure.identifierAstrophysics Group
dc.contributor.authorOWEN, James
hal.structure.identifierDivision of Geological and Planetary Sciences [Pasadena]
dc.contributor.authorSTAMENKOVIĆ, Vlada
hal.structure.identifierSchool of Physics and Astronomy [Birmingham]
dc.contributor.authorTRIAUD, Amaury
dc.date.issued2018-03
dc.description.abstractEnSeven temperate Earth-sized exoplanets readily amenable for atmospheric studies transit the nearby ultracool dwarf star TRAPPIST-1. Their atmospheric regime is unknown and could range from extended primordial hydrogen-dominated to depleted atmospheres. Hydrogen in particular is a powerful greenhouse gas that may prevent the habitability of inner planets while enabling the habitability of outer ones. An atmosphere largely dominated by hydrogen, if cloud-free, should yield prominent spectroscopic signatures in the near-infrared detectable during transits. Observations of the innermost planets have ruled out such signatures. However, the outermost planets are more likely to have sustained such a Neptune-like atmosphere. Here, we report observations for the four planets within or near the system’s habitable zone, the circumstellar region where liquid water could exist on a planetary surface. These planets do not exhibit prominent spectroscopic signatures at near-infrared wavelengths either, which rules out cloud-free hydrogen-dominated atmospheres for TRAPPIST-1 d, e and f, with significance of 8σ, 6σ and 4σ, respectively. Such an atmosphere is instead not excluded for planet g. As high-altitude clouds and hazes are not expected in hydrogen-dominated atmospheres around planets with such insolation, these observations further support their terrestrial and potentially habitable nature.
dc.language.isoen
dc.publisherNature Publishing Group
dc.title.enAtmospheric reconnaissance of the habitable-zone Earth-sized planets orbiting TRAPPIST-1
dc.typeArticle de revue
dc.identifier.doi10.1038/s41550-017-0374-z
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.identifier.arxiv1802.02250
dc.description.sponsorshipEuropeClassifying the Range of Exoplanetary Atmospheres using Transmission and Emission Spectroscopy
dc.description.sponsorshipEuropeSPECULOOS: searching for habitable planets amenable for biosignatures detection around the nearest ultra-cool stars
bordeaux.journalNature Astronomy
bordeaux.page214 - 219
bordeaux.volume2
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-01729026
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01729026v1
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