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dc.contributor.authorTriaud, Amaury H. M. J.
dc.contributor.authorGillon, Michael
dc.contributor.authorEhrenreich, David
dc.contributor.authorHerrero, Enrique
dc.contributor.authorLendl, Monika
dc.contributor.authorAnderson, David R.
dc.contributor.authorCameron, Andrew Collier
dc.contributor.authorDelrez, Laetitia
dc.contributor.authorDemory, Brice-Olivier
dc.contributor.authorHellier, Coel
dc.contributor.authorHeng, Keving
dc.contributor.authorJehin, Emmanuel
dc.contributor.authorMaxted, Pierre F. L.
dc.contributor.authorPollacco, Don
dc.contributor.authorQueloz, Didier
dc.contributor.authorRibas, Ignasi
dc.contributor.authorSmalley, Barry
dc.contributor.authorSmith, Alexis Michael Sheridan
dc.contributor.authorUdry, Stephane
dc.identifier.citationTriaud , A H M J , Gillon , M , Ehrenreich , D , Herrero , E , Lendl , M , Anderson , D R , Cameron , A C , Delrez , L , Demory , B-O , Hellier , C , Heng , K , Jehin , E , Maxted , P F L , Pollacco , D , Queloz , D , Ribas , I , Smalley , B , Smith , A M S & Udry , S 2015 , ' WASP-80b has a dayside within the T-dwarf range ' , Monthly Notices of the Royal Astronomical Society , vol. 450 , no. 3 , pp. 2279-2290 .
dc.identifier.otherPURE: 216836164
dc.identifier.otherPURE UUID: 9409e68e-ff6e-4d97-88fd-5b869cd3c47d
dc.identifier.otherScopus: 84930831768
dc.identifier.otherORCID: /0000-0002-8863-7828/work/58531401
dc.identifier.otherWOS: 000356339300004
dc.descriptionAHMJT is a Swiss National Science Foundation (SNSF) fellow under grant number P300P2-147773. MG and EJ are Research Associates at the F.R.S-FNRS; LD received the support the support of the F.R.I.A. fund of the FNRS. DE, KH, and SU acknowledge the financial support of the SNSF in the frame of the National Centre for Competence in Research ‘PlanetS’. EH and IR acknowledge support from the Spanish Ministry of Economy and Competitiveness (MINECO) and the ‘Fondo Europeo de Desarrollo Regional’ (FEDER) through grants AYA2012-39612-C03-01 and ESP2013-48391-C4-1-R.en
dc.description.abstractWASP-80b is a missing link in the study of exo-atmospheres. It falls between the warm Neptunes and the hot Jupiters and is amenable for characterisation, thanks to its host star's properties. We observed the planet through transit and during occultation with Warm Spitzer. Combining our mid-infrared transits with optical time series, we find that the planet presents a transmission spectrum indistinguishable from a horizontal line. In emission, WASP-80b is the intrinsically faintest planet whose dayside flux has been detected in both the 3.6 and 4.5 $\mu$m Spitzer channels. The depths of the occultations reveal that WASP-80b is as bright and as red as a T4 dwarf, but that its temperature is cooler. If planets go through the equivalent of an L-T transition, our results would imply this happens at cooler temperatures than for brown dwarfs. Placing WASP-80b's dayside into a colour-magnitude diagram, it falls exactly at the junction between a blackbody model and the T-dwarf sequence; we cannot discern which of those two interpretations is the more likely. Flux measurements on other planets with similar equilibrium temperatures are required to establish whether irradiated gas giants, like brown dwarfs, transition between two spectral classes. An eventual detection of methane absorption in transmission would also help lift that degeneracy. We obtained a second series of high-resolution spectra during transit, using HARPS. We reanalyse the Rossiter-McLaughlin effect. The data now favour an aligned orbital solution and a stellar rotation nearly three times slower than stellar line broadening implies. A contribution to stellar line broadening, maybe macroturbulence, is likely to have been underestimated for cool stars, whose rotations have therefore been systematically overestimated. [abridged]
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rightsThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society All rights reserved.en
dc.subjectPlanets and satellites: atmospheresen
dc.subjectPlanets and satellites: individual: WASP-80ben
dc.subjectBinaries: eclipsingen
dc.subjectBrown dwarfsen
dc.subjectHertzsprung–Russell and colour–magnitude diagramsen
dc.subjectStars: late-typeen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleWASP-80b has a dayside within the T-dwarf rangeen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.description.statusPeer revieweden

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