J/A+A/530/A5ivo://CDS.VizieR/J/A+A/530/A5doi:10.26093/cds/vizier.35300005CDSCaceres C.Ivanov V.D.Minniti D.Burrows A.Selman F.Melo C.,Naef D.Mason E.Pietrzynski G.2017-06-28T06:58:14Z2011-04-28T12:48:51ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsoccultationapparent-magnitudeSecondary eclipses are a powerful tool to measure directly the thermal emission from extrasolar planets, and to constrain their type and physical parameters. We started a project to obtain reliable broad-band measurements of the thermal emission of transiting exoplanets. Ground-based high-cadence near-infrared relative photometry was used to obtain a sub-millimagnitude precision light curve of a secondary eclipse of WASP-4b -- a 1.12M_J_ hot Jupiter on a 1.34-day orbit around G7V star. The data show a clear ~10{sigma} detection of the planet's thermal emission at 2.2{mu}. The calculated thermal emission corresponds to a fractional eclipse depth of 0.185^+0.014^_-0.013_%, with a related brightness temperature in Ks of T_B_=1995+/-40K, centered at Tc=2455102.61162^+0.00071^_-0.00077_HJD. We could set a limit on the eccentricity of e*cos{omega}=0.0027+/-0.0018, compatible with a near-circular orbit. The calculated brightness temperature, and the specific models suggest a highly inefficient redistribution of heat from the day-side to the night-side of the planet, and a consequent emission mainly from the day-side. The high-cadence ground-based technique is capable of detecting the faint signal of the secondary eclipse of extrasolar planets, which makes it a valuable complement to space-based mid-IR observations.2011A&A...530A...5Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/530/A5CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/408/1680 : WASP-2 transiting planetary system (Southworth+, 2010)J/MNRAS/399/287 : WASP-4 transiting planetary system (Southworth+, 2009)J/AJ/137/3826 : WASP-4b, two transits of the giant planet (Winn+, 2009)J/MNRAS/396/1023 : WASP-5 transiting planetary system (Southworth+, 2009)J/A+A/501/785 : WASP-6b, discovery and characterization of (Gillon+, 2009)J/A+A/527/A8 : WASP-7 transiting planetary system (Southworth+, 2011)J/A+A/517/L1 : WASP-8b radial velocities (Queloz+, 2010)J/ApJ/692/L100 : WASP-10 relative photometry (Johnson+, 2009)J/A+A/528/A65 : WASP-12b transits (Maciejewski+, 2011)J/A+A/502/391 : WASP-13b photometry and radial velocities (Skillen+, 2009)J/ApJ/707/167 : WASP-18 transiting planetary system (Southworth+, 2009)J/A+A/513/L3 : WASP-19b H-band thermal emission (Anderson+, 2010)J/A+A/519/A98 : WASP-21b transit (Bouchy+, 2010)J/A+A/520/A56 : WASP-26b RV and photometric data (Smalley+, 2010)J/A+A/526/L10 : WASP-33 photometric follow-up (Herrero+, 2011)J/A+A/526/A130 : WASP-34b photometry and radial velocities (Smalley+, 2011)J/A+A/525/A54 : WASP-38b transits (Barros+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/530/A5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/530/A5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/530/A5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/530/A5https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/530/A5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/530/A5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/530/A5/table1Secondary eclipse light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodoublee_FluxFlux error estimationstat.error;phot.fluxdouble