J/ApJ/707/167ivo://CDS.VizieR/J/ApJ/707/167doi:10.26093/cds/vizier.17070167CDSSouthworth J.Hinse T.C.Dominik M.Glitrup M.Jorgensen U.G.,Liebig C.Mathiasen M.Calchi Novati S.Dreizler S.Finet F.,Harpsoe K.Hessman R.Hundertmark M.Maier G.Mancini L.Maxted P.F.L.,Rahvar S.Ricci D.Scarpetta G.Skottfelt J.Snodgrass C.Surdej J.,Zimmer F.2026-05-19T14:24:40Z2010-01-10T22:36:44ZCDS support team

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

cds-question@unistra.frsolar-system-planetsphotometryWe present high-precision photometry of five consecutive transits of WASP-18, an extrasolar planetary system with one of the shortest orbital periods known. Through the use of telescope defocussing we achieve a photometric precision of 0.47 to 0.83mmag per observation over complete transit events. The data are analysed using the JKTEBOP code and three different sets of stellar evolutionary models. We point out that seven of the nine known massive transiting planets have eccentric orbits, whereas significant orbital eccentricity has been detected for only four of the 46 less massive planets. This may indicate that there are two different populations of transiting planets, but could also be explained by observational biases. Further radial velocity observations of low-mass planets will make it possible to choose between these two scenarios.2009ApJ...707..167Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/707/167CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)J/AJ/137/3826 : Two transits of the giant planet WASP-4b (Winn+, 2009)J/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)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/707/167https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/707/167http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/707/167https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/707/167https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/707/167http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/707/167GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/707/167/wasp18Defocussed photometry of WASP-18 (table2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD for the midpoint of observationdtime.epochdoubleVmagDifferential V-band magnitude of WASP-18magphot.mag;em.opt.Vdoublee_VmagMeasurement error of the R-band magnitudemagstat.error;phot.mag;em.opt.Vdouble