J/A+A/551/A108ivo://CDS.VizieR/J/A+A/551/A108doi:10.26093/cds/vizier.35510108CDSMaciejewski G.Dimitrov D.Seeliger M.Raetz St.Bukowiecki L.,Kitze M.Errmann R.Nowak G.Niedzielski A.Popov V.Marka C.,Gozdziewski K.Neuhaeuser R.Ohlert J.Hinse T.C.Lee J.W.,Lee C.-U.Yoon J.-N.Berndt A.Gilbert H.Ginski C.Hohle M.M.,Mugrauer M.Roll T.Schmidt T.O.B.Tetzlaff N.Mancini L.,Southworth J.Dall'Ora M.Ciceri S.Zambelli R.Corfini G.,Takahashi H.Tachihara K.Benko J.M.Sarneczky K.Szabo Gy.M.,Varga T.N.Vanko MJoshi Y.C.Chen W.P.2017-06-26T11:50:41Z2013-03-04T07:56:43ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsccd-photometryThe transiting planet WASP-12 b was identified as a potential target for transit-timing studies because a departure from a linear ephemeris has been reported in the literature. Such deviations could be caused by an additional planet in the system. We attempt to confirm the claimed variations in transit timing and interpret their origin. We organised a multi-site campaign to observe transits by WASP-12 b in three observing seasons, using 0.5-2.6-metre telescopes. We obtained 61 transit light curves, many of them with sub-millimagnitude precision. The simultaneous analysis of the best-quality datasets allowed us to obtain refined system parameters, which agree with values reported in previous studies. The residuals versus a linear ephemeris reveal a possible periodic signal that may be approximated by a sinusoid with an amplitude of 0.00068+/-0.00013d and period of 500+/-20 orbital periods of WASP-12 b. The joint analysis of timing data and published radial velocity measurements results in a two-planet model that explains observations better than do single-planet scenarios. We hypothesise that WASP-12 b might not be the only planet in the system, and there might be the additional 0.1M_Jup_ body on a 3.6-d eccentric orbit. A dynamical analysis indicates that the proposed two-planet system is stable on long timescales.2013A&A...551A.108Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/551/A108CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/408/1680 : Transiting planetary system WASP-2 (Southworth+, 2010)J/ApJ/715/421 : Relative photometry of WASP-3 (Tripathi+, 2010)J/AJ/137/3826 : Two transits of the giant planet WASP-4b (Winn+, 2009)J/A+A/539/A159 : WASP-4b transit griz light curves (Nikolov+, 2012)J/ApJ/733/127 : Four transits of WASP-4b (Sanchis-Ojeda+, 2011)J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)J/A+A/530/A5 : WASP-4b thermal emission Ks-band detection (Caceres+, 2011)J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)J/A+A/501/785 : Discovery and characterization of WASP-6b (Gillon+, 2009)J/A+A/527/A8 : Transiting planetary system WASP-7 (Southworth+, 2011)J/A+A/517/L1 : Radial velocities of WASP-8b planet (Queloz+, 2010)J/ApJ/692/L100 : Relative photometry of WASP-10 (Johnson+, 2009)J/A+A/535/A7 : Transit light curves of WASP-10 b (Maciejewski+, 2011)J/A+A/502/391 : WASP-13b photometry and radial velocities (Skillen+, 2009)J/ApJ/709/159 : Relative Ic photometry of WASP-17 (Anderson+, 2010)J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009)J/A+A/513/L3 : WASP-19b H-band thermal emission (Anderson+, 2010)J/A+A/519/A98 : Transit of exoplanet WASP-21b (Bouchy+, 2010)J/A+A/534/A16 : WASP-22 & WASP-26 photometry & velocities (Anderson+, 2011J/A+A/531/A24 : WASP-23 photometric & radial velocity data (Triaud+, 2011)J/A+A/520/A56 : WASP-26b RV and photometric data (Smalley+, 2010)J/ApJ/726/L19 : Gunn r photometry of WASP-30 (Anderson+, 2011)J/A+A/549/A18 : WASP-30 & J1219-39 light + velocity curves (Triaud+, 2013)J/A+A/531/A60 : WASP-31b photometry and radial velocities (Anderson+, 2011)J/A+A/526/L10 : Transits of WASP-33 (Herrero+, 2011)J/A+A/526/A130 : WASP-34b photometry and radial velocities (Smalley+, 2011)J/A+A/525/A54 : Transits of WASP-38b (Barros+, 2011)J/A+A/531/A40 : Transits of WASP-39b (Faedi+, 2011)J/A+A/533/A88 : WASP-50b photometry and radial velocities (Gillon+, 2011)J/A+A/544/A72 : WASP-42 & WASP-49 photometry and velocities (Lendl+, 2012)J/A+A/542/A4 : WASP-43b thirty eclipses (Gillon+, 2012)J/A+A/547/A61 : WASP78 and WASP79 RV and photometric data (Smalley+, 2012)J/ApJ/720/872 : A spectropolarimetric analysis of WASP-12 (Fossati+, 2010)J/AJ/141/179 : Transits of TrES-4b, HAT-P-3b and WASP-12b (Chan+, 2011)J/ApJ/727/125 : On the orbit of exoplanet WASP-12b (Campo+, 2011)J/A+A/528/A65 : WASP-12b transits (Maciejewski+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/551/A108https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/551/A108http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/551/A108https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/551/A108https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/551/A108http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/551/A108GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/551/A108/w12dataLight curves of transits of WASP-12 brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescope codemeta.code;instr.telcharBJDBarycentric JD in Barycentric Dynamical Timedtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodouble