Reference : Probing the atmosphere of a sub-Jovian planet orbiting a cool dwarf
 Document type : Scientific journals : Article Discipline(s) : Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics To cite this reference: http://hdl.handle.net/2268/212093
 Title : Probing the atmosphere of a sub-Jovian planet orbiting a cool dwarf Language : English Author, co-author : Sedaghati, Elyar [> >] Boffin, Henri M. J. [> >] Delrez, Laetitia [> >] Gillon, Michaël [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >] Csizmadia, Szilard [> >] Smith, Alexis M. S. [> >] Rauer, Heike [> >] Publication date : 1-Jul-2017 Journal title : Monthly Notices of the Royal Astronomical Society Publisher : Blackwell Publishing Volume : 468 Pages : 3123-3134 Peer reviewed : Yes (verified by ORBi) Audience : International ISSN : 0035-8711 e-ISSN : 1365-2966 City : Oxford Country : United Kingdom Abstract : [en] We derive the 0.01 $\mu$m binned transmission spectrum, between 0.74 and 1.0 $\mu$m, of WASP-80b from low resolution spectra obtained with the FORS2 instrument attached to ESO's Very Large Telescope. The combination of the fact that WASP-80 is an active star, together with instrumental and telluric factors, introduces correlated noise in the observed transit light curves, which we treat quantitatively using Gaussian Processes. Comparison of our results together with those from previous studies, to theoretically calculated models reveals an equilibrium temperature in agreement with the previously measured value of 825K, and a sub-solar metallicity, as well as an atmosphere depleted of molecular species with absorption bands in the IR ($\gg 5\sigma$). Our transmission spectrum alone shows evidence for additional absorption from the potassium core and wing, whereby its presence is detected from analysis of narrow 0.003 $\mu$m bin light curves ($\gg 5\sigma$). Further observations with visible and near-UV filters will be required to expand this spectrum and provide more in-depth knowledge of the atmosphere. These detections are only made possible through an instrument-dependent baseline model and a careful analysis of systematics in the data. Permalink : http://hdl.handle.net/2268/212093 DOI : 10.1093/mnras/stx646 Other URL : http://adsabs.harvard.edu/abs/2017MNRAS.468.3123S

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