J/A+A/633/A30ivo://CDS.VizieR/J/A+A/633/A30doi:10.26093/cds/vizier.36330030CDSMancini L.Sarkis P.Henning T.Bakos G.A.Bayliss D.Bento J.,Bhatti W.Brahm R.Csubry Z.Espinoza N.Hartman J.Jordan A.,Penev K.Rabus M.Suc V.de Val-Borro M.Zhou G.Chen G.,Damasso M.Southworth J.Tan T.G.2020-01-03T07:29:15Z2020-01-03T08:25:40ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsphotometryradial-velocityThe transiting exoplanetary system WASP-174 was reported to be composed by a main-sequence F star and a giant planet, WASP-174b. However only an upper limit was placed on the planet mass, and a highly uncertain planetary radius was determined. We aim to better characterise both the star and the planet and precisely measure their orbital and physical parameters. In order to constrain the mass of the planet, we obtained new measurements of the radial velocity of the star and joined them with those from the discovery paper. Photometric data Q1 from the HATSouth survey and new multi-band, high-quality (precision reached up to 0.37mmag) photometric follow-up observations of transit events were acquired and analysed for getting accurate photometric parameters. We fit the model to all the observations, including data from the TESS space telescope, in two different modes: incorporating the stellar isochrones into the fit, and using an empirical method to get the stellar parameters. The two modes resulted to be consistent with each other. We confirm the grazing nature of the WASP-174b transits, which is also corroborated by simultaneously observing the transit through four optical bands and noting how the transit depth changes due to the limb-darkening effect. We estimate that 76% of the disk of the planet actually eclipses the parent star at mid-transit of its transit events. We find that WASP-174b is a highly-inflated hot giant planet with a mass of 0.330M_Jup_ and a radius of 1.435R_Jup_, and is therefore a good target for transmission-spectroscopy observations. With a density of 0.135g/cm^3^, it is amongst the lowest-density planets ever discovered with precisely measured mass and radius.2020A&A...633A..30Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/633/A30CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/633/A30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/633/A30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/633/A30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/633/A30https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/633/A30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/633/A30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/633/A30/hsPhotom. of WASP-174 from the HATSouth surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/tessPhotom. of WASP-174 from TESSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/grond-gPhotom. of WASP-174 on 2019/04/09 (GROND g)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/grond-rPhotom. of WASP-174 on 2019/04/09 (GROND r)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/grond-zPhotom. of WASP-174 on 2019/04/09 (GROND z)magDifferential magnitude of the targetmagphot.mag;arith.diffdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/grond-jPhotom. of WASP-174 on 2019/04/09 (GROND J)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/grond-hPhotom. of WASP-174 on 2019/04/09 (GROND H)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/grond-kPhotom. of WASP-174 on 2019/04/09 (GROND K)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/lco-gPhotom. of WASP-174 on 2015/03/24 (LCO 1m g)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/lco-iPhotom. of WASP-174 on 2016/04/16 (LCO 1m i)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/pest-rPhotom. of WASP-174 on 2015/03/07 (PEST 30cm R)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/aat-ksPhotom. of WASP-174 on 2015/03/07 (AAT Ks)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/grond-iPhotom. of WASP-174 on 2019/04/09 (GROND i)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD (TDB) for the midpoint of observation (BJD-2400000)dtime.epochdoublemagDifferential magnitude of the targetmagphot.mag;arith.diffdoublee_magMeasurement error of the magnitudemagstat.error;phot.magdoubleJ/A+A/633/A30/rvRV measurements of WASP-174 (FEROS)PhasePhasetime.phasedoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD for the midpoint of observation ((TDB)dtime.epochdoubleRVRadial Velocity (RV) of the targetm/sphys.veloc;pos.heliocentricfloate_RVMeasurement error of RVm/sstat.errorfloatBS? Bisector span (BS)m/sphys.velocfloatnullablee_BS? Measurement error of BSm/sstat.errorfloatnullableInstInstrument (FEROS)meta.id;instrchar