J/MNRAS/490/4230ivo://CDS.VizieR/J/MNRAS/490/4230doi:10.26093/cds/vizier.74904230CDSSouthworth J.Dominik M.Jorgensen U.G.Andersen M.I.Bozza V.,Burgdorf M.J.D'ago G.Dib S.Figuera Jaimes R.Fujii Y.I.Gill S.,Haikala L.K.Hinse T.C.Hundertmark M.Khalouei E.Korhonen H.,Longa-pena P.Mancini L.Peixinho N.Rabus M.Rahvar S.Sajadian S.,Skottfelt J.Snodgrass C.Spyratos P.Tregloan-reed J.Unda-sanzana E.,Von Essen C.2024-08-20T20:14:04Z2020-01-20T13:12:24ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsTransits in the planetary system WASP-4 were recently found to occur 80s earlier than expected in observations from the TESS satellite. We present 22 new times of mid-transit that confirm the existence of transit timing variations, and are well fitted by a quadratic ephemeris with period decay dP/dt=-9.2+/-1.1ms/yr. We rule out instrumental issues, stellar activity and the Applegate mechanism as possible causes. The light-time effect is also not favoured due to the non-detection of changes in the systemic velocity. Orbital decay and apsidal precession are plausible but unproven. WASP-4b is only the third hot Jupiter known to show transit timing variations to high confidence. We discuss a variety of observations of this and other planetary systems that would be useful in improving our understanding of WASP-4 in particular and orbital decay in general.2019MNRAS.490.4230Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/490/4230CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009)J/MNRAS/408/1680 : Transiting planetary system WASP-2 (Southworth+, 2010)J/A+A/527/A8 : Transiting planetary system WASP-7 (Southworth+, 2011)J/MNRAS/420/2580 : Four transits of HAT-P-13 (Southworth+, 2012)J/MNRAS/422/3099 : Transits of HAT-P-5 (Southworth+, 2012)J/MNRAS/426/1338 : Transiting planetary system WASP-17 (Southworth+, 2012)J/MNRAS/434/1300 : Planetary systems WASP-15, WASP-16 (Southworth+, 2013)J/MNRAS/444/776 : WASP-24, WASP-25 and WASP-26 (Southworth+, 2014)J/MNRAS/447/711 : Transiting planetary system WASP-103 (Southworth+, 2015)J/MNRAS/454/3094 : Transiting planetary system WASP-57 (Southworth+, 2016)J/MNRAS/457/4205 : WASP-22, WASP-41, WASP-42 and WASP-55 (Southworth+, 2016)J/AJ/153/191 : Transiting planetary system GJ 1132 (Southworth+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/490/4230https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/490/4230http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/490/4230https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/490/4230https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/490/4230http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/490/4230GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/MNRAS/490/4230/wasp4allDifferential photometry of WASP-4recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescope used for the observationinstr.setupcharFiltFilter used for the observation, R_Cousins or r_SDSSinstr.setup;instr.filtercharBJDBarycentric Julian Date for the midpoint of observation (TDB)dtime.epochdoublemagDifferential magnitudemagphot.mag;arith.diffdoublee_magMeasurement error of the differential magnitudemagstat.error;phot.magdouble