J/ApJ/725/2017ivo://CDS.VizieR/J/ApJ/725/2017doi:10.26093/cds/vizier.17252017CDSKipping D.M.Bakos G.A.Hartman J.Torres G.Shporer A.Latham D.W.,Kovacs G.Noyes R.W.Howard A.W.Fischer D.A.Johnson J.A.Marcy G.W.,Beky B.Perumpilly G.Esquerdo G.A.Sasselov D.D.Stefanik R.P.,Lazar J.Papp I.Sari P.2017-06-22T14:29:33Z2012-08-29T10:55:56ZCDS support team

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

cds-question@unistra.frphotometrysolar-system-planetsmultiple-starsf-starsWe report the discovery of HAT-P-24b, a transiting extrasolar planet orbiting the moderately bright V=11.818 F8 dwarf star GSC 0774-01441, with a period P=3.3552464+/-0.0000071 days, transit epoch T_c_=2455216.97669+/-0.00024(BJD), and transit duration 3.653+/-0.025hr. The host star has a mass of 1.191+/-0.042M_{sun}_, radius of 1.317+/-0.068R_{sun}_, effective temperature 6373+/-80K, and a low metallicity of [Fe/H]=-0.16+/-0.08. The planetary companion has a mass of 0.681+/-0.031M_J_ and radius of 1.243+/-0.072R_J_ yielding a mean density of 0.439+/-0.069g/cm^3^. By repeating our global fits with different parameter sets, we have performed a critical investigation of the fitting techniques used for previous Hungarian-made Automated Telescope planetary discoveries. We find that the system properties are robust against the choice of priors.2010ApJ...725.2017Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/725/2017CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/306 : The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)J/MNRAS/422/2024 : X-ray-age relation & exoplanet evaporation (Jackson+, 2012)J/MNRAS/414/108 : Calibrator of exoplanet-host stars (Beust+, 2011)J/MNRAS/411/L46 : Exoplanet magnetic fields (Vidotto+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/725/2017https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/725/2017http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/725/2017https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/725/2017https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/725/2017http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/725/2017GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/725/2017/table3High-precision differential photometry of HAT-P-24recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date (BJD-2400000)dtime.epochdoublemagDifferential magnitude in i-band (1)magphot.mag;arith.diffdoublee_magThe 1{sigma} uncertainty in magmagstat.error;phot.magdoubleF[i] Filter used (FLWO and FTN/KeplerCam Sloan i-band)meta.code;instr.filterchar