Physical properties and transmission spectrum of the WASP-80 planetary system from multi-colour photometry

Astrophysics - Earth and Planetary Astrophysics; planetary systems; stars: fundamental parameters; stars: individual:; WASP-80; techniques: photometric

Abstract :

[en] WASP-80 is one of only two systems known to contain a hot Jupiter which transits its M-dwarf host star. We present eight light curves of one transit event, obtained simultaneously using two defocussed telescopes. These data were taken through the Bessell I, Sloan g'r'i'z' and near-infrared JHK passbands. We use our data to search for opacity-induced changes in the planetary radius, but find that all values agree with each other. Our data are therefore consistent with a flat transmission spectrum to within the observational uncertainties. We also measure an activity index of the host star of log R '[SUB]HK[/SUB] = -4.495, meaning that WASP-80 A shows strong chromospheric activity. The non-detection of starspots implies that, if they exist, they must be small and symmetrically distributed on the stellar surface. We model all available optical transit light curves and obtain improved physical properties and orbital ephemerides for the system. Full Table 2 is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/562/A126">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/562/A126</A>

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Mancini, L.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany

Southworth, J.; Astrophysics Group, Keele University, Keele, ST5 5BG, UK

Ciceri, S.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany

Dominik, M.; SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews, KY16 9SS, UK

Henning, Th; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany

Jørgensen, U. G.; Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, 2100, Copenhagen Ø, Denmark ; Centre for Star and Planet Formation, Geological Museum, Øster Voldgade 5-7, 1350, Copenhagen, Denmark

Lanza, A. F.; INAF-Osservatorio Astrofisico di Catania, via S.Sofia 78, 95123, Catania, Italy

Rabus, M.; Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile ; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany

Snodgrass, C.; Max-Planck-Institute for Solar System Research, Max-Planck Str. 2, 37191, Katlenburg-Lindau, Germany

Vilela, C.; Astrophysics Group, Keele University, Keele, ST5 5BG, UK

More authors (22 more)

Language :

English

Title :

Physical properties and transmission spectrum of the WASP-80 planetary system from multi-colour photometry

Publication date :

01 February 2014

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

562

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://esoads.eso.org/abs/2014A%26A...562A.126M

Available on ORBi :

since 24 January 2014

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