J/A+A/519/A98ivo://CDS.VizieR/J/A+A/519/A98doi:10.26093/cds/vizier.35190098CDSBouchy F.HebbL.SkillenI.Collier CameronA.SmalleyB.,Udry S.Anderson D.R.Boisse I.Enoch B.Haswell C.A.Hebrard G.,Hellier C.Joshi Y.Kane S.R.Maxted P.F.L.Mayor M.Moutou C.,Pepe F.Pollacco D.Queloz D.Segransan D.Simpson E.K.Smith A.M.S.,Stempels H.C.Street R.Triaud A.H.M.J.West R.G.Wheatley P.J.2017-06-20T13:16:38Z2010-09-20T13:34:17ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsolar-system-planetsphotometryWe report the discovery of WASP-21b, a new transiting exoplanet discovered by the Wide Angle Search for Planets (WASP) Consortium and established and characterized with the FIES, SOPHIE, CORALIE and HARPS fiber-fed echelle spectrographs. A 4.3-d period, 1.1% transit depth and 3.4-h duration are derived for WASP-21b using SuperWASP-North and high precision photometric observations at the Liverpool Telescope. Simultaneous fitting to the photometric and radial velocity data with a Markov Chain Monte Carlo procedure leads to a planet in the mass regime of Saturn. With a radius of 1.07R_Jup_ and mass of 0.30M_Jup_, WASP-21b has a density close to 0.24{rho}_Jup_ corresponding to the distribution peak at low density of transiting gaseous giant planets. With a host star metallicity [Fe/H] of -0.46, WASP-21b strengthens the correlation between planetary density and host star metallicity for the five known Saturn-like transiting planets. Furthermore there are clear indications that WASP-21b is the first transiting planet belonging to the thick disc.2010A&A...519A..98Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/519/A98CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/501/785 : Discovery and characterization of WASP-6b (Gillon+, 2009)J/A+A/502/391 : WASP-13b photometry and radial velocities (Skillen+, 2009)J/AJ/137/3826 : Two transits of the giant planet WASP-4b (Winn+, 2009)J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009)J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)J/A+A/513/L3 : H-band thermal emission of WASP-19b (Anderson+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/519/A98https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/519/A98http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/519/A98https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/519/A98https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/519/A98http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/519/A98GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/519/A98/table1SWASP photometric measurements of WASP-21recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoublemagCorrected magnitudemagphot.magdoublee_mag? Error of magnitudemagstat.error;phot.magdoublenullableJ/A+A/519/A98/table2FTN (2m Faulkes Telescope North) measurementsHJDHeliocentric Julian Datedtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintmagCorrected magnitudemagphot.magdoublee_mag? Error of magnitudemagstat.error;phot.magdoublenullableJ/A+A/519/A98/table3RISE measurements (on 2m Liverpool telescope, La Palma)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoublemagCorrected magnitudemagphot.magdoublee_mag? Error of magnitudemagstat.error;phot.magdoublenullable