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ARES I: WASP-76 b, A Tale of Two HST Spectra

hal.structure.identifierDepartment of Physics and Astronomy [UCL London]
dc.contributor.authorEDWARDS, Billy
hal.structure.identifierDepartment of Physics and Astronomy [UCL London]
dc.contributor.authorCHANGEAT, Quentin
hal.structure.identifierInstituut voor Sterrenkunde [Leuven]
dc.contributor.authorBAEYENS, Robin
hal.structure.identifierDepartment of Physics and Astronomy [UCL London]
dc.contributor.authorTSIARAS, Angelos
hal.structure.identifierDepartment of Physics and Astronomy [UCL London]
dc.contributor.authorAL-REFAIE, Ahmed
hal.structure.identifierDepartment of Atmospheric, Oceanic and Planetary Physics [Oxford] [AOPP]
dc.contributor.authorTAYLOR, Jake
hal.structure.identifierDepartment of Physics and Astronomy [UCL London]
dc.contributor.authorYIP, Kai Hou
hal.structure.identifierCollege of Engineering, Mathematics and Physical Sciences [Exeter] [EMPS]
dc.contributor.authorBIEGER, Michelle Fabienne
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorBLAIN, Doriann
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
hal.structure.identifierInstitut d'Astrophysique de Paris [IAP]
hal.structure.identifierPLANETO - LATMOS
dc.contributor.authorGRESSIER, Amélie
hal.structure.identifierDipartimento di Fisica [Torino]
hal.structure.identifierINAF - Osservatorio Astrofisico di Torino [OATo]
dc.contributor.authorGUILLUY, Gloria
hal.structure.identifierECLIPSE 2020
dc.contributor.authorJAZIRI, Adam Yassin
hal.structure.identifierInstitut d'Astrophysique de Paris [IAP]
dc.contributor.authorKIEFER, Flavien
hal.structure.identifierINAF - Osservatorio Astronomico di Palermo [OAPa]
hal.structure.identifierDipartimento di Fisica e Chimica [Palermo] [DiFC]
dc.contributor.authorMODIRROUSTA-GALIAN, Darius
hal.structure.identifierDepartment of Physics and Astronomy [UCL London]
dc.contributor.authorMORVAN, Mario
hal.structure.identifierDipartimento di Fisica [Roma La Sapienza]
dc.contributor.authorMUGNAI, Lorenzo
hal.structure.identifierECLIPSE 2020
dc.contributor.authorPLURIEL, William
hal.structure.identifierLaboratoire Interuniversitaire des Systèmes Atmosphériques [LISA (UMR_7583)]
hal.structure.identifierMaison de la Simulation [MDLS]
dc.contributor.authorPOVEDA, Mathilde
hal.structure.identifierDepartment of Physics and Astronomy [UCL London]
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorSKAF, Nour
hal.structure.identifierInstitute for Astronomy [Edinburgh] [IfA]
hal.structure.identifierCentre for Exoplanet Science
dc.contributor.authorWHITEFORD, Niall
hal.structure.identifierDepartment of Physics and Astronomy [UCL London]
dc.contributor.authorWRIGHT, Sam
hal.structure.identifierECLIPSE 2020
dc.contributor.authorZINGALES, Tiziano
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorCHARNAY, Benjamin
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorDROSSART, Pierre
hal.structure.identifierECLIPSE 2020
dc.contributor.authorLECONTE, Jérémy
hal.structure.identifierLaboratoire Interuniversitaire des Systèmes Atmosphériques [LISA (UMR_7583)]
dc.contributor.authorVENOT, Olivia
hal.structure.identifierDepartment of Physics and Astronomy [UCL London]
dc.contributor.authorWALDMANN, Ingo
hal.structure.identifierInstitut d'Astrophysique de Paris [IAP]
hal.structure.identifierSchool of Physical Sciences [Hobart]
dc.contributor.authorBEAULIEU, Jean-Philippe
dc.date.issued2020-07-01
dc.identifier.issn0004-6256
dc.description.abstractEnWe analyze the transmission and emission spectra of the ultra-hot Jupiter WASP-76 b, observed with the G141 grism of the Hubble Space Telescope's (HST) Wide Field Camera 3 (WFC3). We reduce and fit the raw data for each observation using the open-source software Iraclis before performing a fully Bayesian retrieval using the publicly available analysis suite TauREx 3. Previous studies of the WFC3 transmission spectra of WASP-76 b found hints of titanium oxide (TiO) and vanadium oxide (VO) or non-gray clouds. Accounting for a fainter stellar companion to WASP-76, we reanalyze this data and show that removing the effects of this background star changes the slope of the spectrum, resulting in these visible absorbers no longer being detected, eliminating the need for a non-gray cloud model to adequately fit the data but maintaining the strong water feature previously seen. However, our analysis of the emission spectrum suggests the presence of TiO and an atmospheric thermal inversion, along with a significant amount of water. Given the brightness of the host star and the size of the atmospheric features, WASP-76 b is an excellent target for further characterization with HST, or with future facilities, to better understand the nature of its atmosphere, to confirm the presence of TiO and to search for other optical absorbers.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.title.enARES I: WASP-76 b, A Tale of Two HST Spectra
dc.typeArticle de revue
dc.identifier.doi10.3847/1538-3881/ab9225
dc.subject.halPlanète et Univers [physics]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv2005.02374
bordeaux.journalThe Astronomical Journal
bordeaux.page8
bordeaux.volume160
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierinsu-02867199
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//insu-02867199v1
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