J/MNRAS/491/2834ivo://CDS.VizieR/J/MNRAS/491/2834doi:10.26093/cds/vizier.74912834CDSCostes J.C.Watson C.A.Belardi C.Braker I.P.Burleigh M.R.,Casewell S.L.Eigmuller P.Gunther M.N.Jackman J.A.G.Nielsen L.D.,Soto M.G.Turner O.Anderson D.R.Bayliss D.Bouchy F.Briegal J.T.,Bryant E.M.Cabrera J.Chaushev A.Csizmadia S.Erikson A.Gill S.,Gillen E.Goad M.R.Hodgkin S.Hooton M.J.Jenkins J.S.McCormac J.,Moyano M.Queloz D.Rauer H.Raynard L.Smith A.M.S.Thompson A.P.G.,Tilbrook R.H.Udry S.Vines J.I.West R.G.Wheatley P.J.2024-08-20T20:14:36Z2023-04-13T15:20:31ZCDS support team

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

cds-question@unistra.frexoplanetsphotometryvisible-astronomyspectroscopystellar-massesstellar-radiieffective-temperaturetrigonometric-parallaxproper-motionsradial-velocitystellar-agesWe report the discovery, by the next generation transit survey (NGTS), of two hot Jupiters NGTS-8b and NGTS-9b. These orbit a V=13.68 K0V star (T_eff_=5241+/-50K) with a period of 2.49970d, and a V=12.80 F8V star (T_eff_=6330+/-130K) in 4.43527d, respectively. The transits were independently verified by follow-up photometric observations with the South African Astronomical Observatory 1.0-m and Euler telescopes, and we report on the planetary parameters using HARPS, FEROS, and CORALIE radial velocities. NGTS-8b has a mass, 0.93^+0.04^_-0.03_M_J_ and a radius, 1.09+/-0.03R_J_ similar to Jupiter, resulting in a density of 0.89^+0.08^_-0.07_gcm^-3^. This is in contrast to NGTS-9b, which has a mass of 2.90+/-0.17M_J_ and a radius of 1.07+/-0.06R_J_, resulting in a much greater density of 2.93^+0.53^_-0.49_gcm^-3^. Statistically, the planetary parameters put both objects in the regime where they would be expected to exhibit larger than predicted radii. However, we find that their radii are in agreement with predictions by theoretical non-inflated models.2020MNRAS.491.2834Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/491/2834CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/615/A76 : Spectroscopic parameters of stars (SPECIES). I. (Soto+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/491/2834https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/491/2834http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/491/2834https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/491/2834https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/491/2834http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/491/2834GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/491/2834/table6 (Stellar Properties for NGTS-8)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/2834/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/2834/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/2834/table6?GETtext/xml+votable180.050000true328.975833-14.0682920.005555555555555556Cone search capability for table J/MNRAS/491/2834/table7 (Stellar Properties for NGTS-9)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/2834/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/2834/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/2834/table7?GETtext/xml+votable180.050000true141.920833-19.3473140.005555555555555556Cone search capability for table J/MNRAS/491/2834/table8 (Planetary properties for NGTS-8b using allesfitter)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/2834/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/2834/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/2834/table8?GETtext/xml+votable180.050000true328.9758258-14.06839610.005555555555555556Cone search capability for table J/MNRAS/491/2834/table9 (Planetary properties for NGTS-9b using allesfitter)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/2834/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/2834/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/2834/table9?GETtext/xml+votable180.050000true141.9206711-19.3476550.0055555555555555566/40347 486041.3088508223161842e-20 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/491/2834?format=asciiOpticaldefaultJ/MNRAS/491/2834/table6Stellar Properties for NGTS-8e_HmagError on Hmag (1)magstat.error;phot.magfloatKmag2MASS K-band magnitude (1)magphot.mag;em.IR.Kfloate_KmagError on Kmag (1)magstat.error;phot.magfloatW1magWISE W1 (3.4um) band magnitude (4)magphot.mag;em.IR.3-4umfloate_W1magError on W1mag (4)magstat.error;phot.magfloatW2magWISE W2 (4.6um) band magnitude (4)magphot.mag;em.IR.4-8umfloate_W2magError on W2mag (4)magstat.error;phot.magfloatW3magWISE W3 (12um) band magnitude (4)magphot.flux.density;em.IR.8-15umfloate_W3magError on W3mag (4)magstat.error;phot.magfloatSpTypeSpectral type (2)src.spTypecharTeffEffective temperature (5)Kphys.temperature.effectiveinte_TeffError on Teff (5)Kstat.error;phys.temperature.effectiveint[Fe/H]Fe/H abundance ratio (5)phys.abund.Fe;arith.ratiofloate_[Fe/H]Error on [Fe/H] (5)stat.error;phys.abund.FefloatvsiniProjected rotational velocity (5)km/sphys.veloc.rotatfloate_vsiniError on vsini (5)km/sstat.error;phys.veloc.rotatfloatvmacMacroturbulent velocity (5)km/sphys.velocfloate_vmacError on vmac (5)km/sstat.errorfloatloggSurface gravity (5)log(cm.s**-2)phys.gravityfloate_loggError on logg (5)log(cm.s**-2)stat.errorfloatMassStar mass (5)solMassphys.massfloatE_MassUpper error on Mass (5)solMassstat.error;stat.maxfloate_MassLower error on Mass (5)solMassstat.error;phys.massfloatRadStar radius (5)solRadphys.size.radiusfloate_RadError on Rad (5)solRadstat.errorfloatDistDistance (2)pcpos.distancefloate_DistError on Dist (2)pcstat.errorfloatNameStar name (NGTS-8 or NGTS-9)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimbadSimbad column added by the CDSmeta.ref.urlcharAgeStar age (5)Gyrtime.agefloatE_AgeUpper error on Age (5)Gyrstat.error;stat.maxfloate_AgeLower error on Age (5)Gyrstat.error;time.agefloatRAJ2000Right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (1)pos.eq.dec;meta.main2MASS2MASS identifier (HHMMSSss+DDMMSSs) (1)meta.idcharGaiaDR2Gaia DR2 source identifier (2)meta.idpmRAProper motion in right ascension (2)mas/yrpos.pm;pos.eq.rafloate_pmRAError on pmRA (2)mas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in declination (2)mas/yrpos.pm;pos.eq.decfloate_pmDEError on pmDE (2)mas/yrstat.error;pos.pm;pos.eq.decfloatplxParallax (2)maspos.parallax.trigfloate_plxError on plx (2)masstat.error;pos.parallaxfloatVmagAPASS V-band magnitude (3)magphot.mag;em.opt.Vfloate_VmagError on Vmag (3)magstat.error;phot.magfloatBmagAPASS B-band magnitude (3)magphot.mag;em.opt.Bfloate_BmagError on Bmag (3)magstat.error;phot.magfloatgmagAPASS g-band magnitude (3)magphot.mag;em.opt.Bfloate_gmagError on gmag (3)magstat.error;phot.magfloatrmagAPASS r-band magnitude (3)magphot.mag;em.opt.Rfloate_rmagError on rmag (3)magstat.error;phot.magfloatimagAPASS i-band magnitude (3)magphot.mag;em.opt.Ifloate_imagError on imag (3)magstat.error;phot.magfloatGmagGaia DR2 G magnitude (2)magphot.mag;em.optfloate_GmagError on Gmag (2)magstat.error;phot.magfloatRPmagGaia DR2 RP magnitude (2)magphot.mag;em.opt.Rfloate_RPmagError on RPmag (2)magstat.error;phot.magfloatBPmagGaia DR2 BP magnitude (2)magphot.mag;em.opt.Bfloate_BPmagError on BPmag (2)magstat.error;phot.magfloatJmag2MASS J-band magnitude (1)magphot.mag;em.IR.Jfloate_JmagError on Jmag (1)magstat.error;phot.magfloatHmag2MASS H-band magnitude (1)magphot.mag;em.IR.HfloatJ/MNRAS/491/2834/table7Stellar Properties for NGTS-9recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (NGTS-8 or NGTS-9)meta.id;meta.maincharRAJ2000Right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (1)pos.eq.dec;meta.main2MASS2MASS identifier (HHMMSSss+DDMMSSs) (1)meta.idcharGaiaDR2Gaia DR2 source identifier (2)meta.idpmRAProper motion in right ascension (2)mas/yrpos.pm;pos.eq.rafloate_pmRAError on pmRA (2)mas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in declination (2)mas/yrpos.pm;pos.eq.decfloate_pmDEError on pmDE (2)mas/yrstat.error;pos.pm;pos.eq.decfloatplxParallax (2)maspos.parallax.trigfloate_plxError on plx (2)masstat.error;pos.parallaxfloatVmagAPASS V-band magnitude (3)magphot.mag;em.opt.Vfloate_VmagError on Vmag (3)magstat.error;phot.magfloatBmagAPASS B-band magnitude (3)magphot.mag;em.opt.Bfloate_BmagError on Bmag (3)magstat.error;phot.magfloatgmagAPASS g-band magnitude (3)magphot.mag;em.opt.Bfloate_gmagError on gmag (3)magstat.error;phot.magfloatrmagAPASS r-band magnitude (3)magphot.mag;em.opt.Rfloate_rmagError on rmag (3)magstat.error;phot.magfloatimagAPASS i-band magnitude (3)magphot.mag;em.opt.Ifloate_imagError on imag (3)magstat.error;phot.magfloatGmagGaia DR2 G magnitude (2)magphot.mag;em.optfloate_GmagError on Gmag (2)magstat.error;phot.magfloatRPmagGaia DR2 RP magnitude (2)magphot.mag;em.opt.Rfloate_RPmagError on RPmag (2)magstat.error;phot.magfloatBPmagGaia DR2 BP magnitude (2)magphot.mag;em.opt.Bfloate_BPmagError on BPmag (2)magstat.error;phot.magfloatJmag2MASS J-band magnitude (1)magphot.mag;em.IR.Jfloate_JmagError on Jmag (1)magstat.error;phot.magfloatHmag2MASS H-band magnitude (1)magphot.mag;em.IR.Hfloate_HmagError on Hmag (1)magstat.error;phot.magfloatKmag2MASS K-band magnitude (1)magphot.mag;em.IR.Kfloate_KmagError on Kmag (1)magstat.error;phot.magfloatW1magWISE W1 (3.4um) band magnitude (4)magphot.mag;em.IR.3-4umfloate_W1magError on W1mag (4)magstat.error;phot.magfloatW2magWISE W2 (4.6um) band magnitude (4)magphot.mag;em.IR.4-8umfloate_W2magError on W2mag (4)magstat.error;phot.magfloatW3magWISE W3 (12um) band magnitude (4)magphot.flux.density;em.IR.8-15umfloate_W3magError on W3mag (4)magstat.error;phot.magfloatSpTypeSpectral type (2)src.spTypecharTeffEffective temperature (5)Kphys.temperature.effectiveinte_TeffError on Teff (5)Kstat.error;phys.temperature.effectiveint[Fe/H]Fe/H abundance ratio (5)phys.abund.Fe;arith.ratiofloate_[Fe/H]Error on [Fe/H] (5)stat.error;phys.abund.FefloatvsiniProjected rotational velocity (5)km/sphys.veloc.rotatfloate_vmacError on vmac (5)km/sstat.errorfloatloggSurface gravity (5)log(cm.s**-2)phys.gravityfloate_loggError on logg (5)log(cm.s**-2)stat.errorfloatMassStar mass (5)solMassphys.massfloatE_MassUpper error on Mass (5)solMassstat.error;stat.maxfloate_MassLower error on Mass (5)solMassstat.error;phys.massfloatRadStar radius (5)solRadphys.size.radiusfloate_RadError on Rad (5)solRadstat.errorfloatAgeStar age (5)Gyrtime.agefloatE_AgeUpper error on Age (5)Gyrstat.error;stat.maxfloate_AgeLower error on Age (5)Gyrstat.error;time.agefloatDistDistance (2)pcpos.distancefloate_DistError on Dist (2)pcstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlchare_vsiniError on vsini (5)km/sstat.error;phys.veloc.rotatfloatvmacMacroturbulent velocity (5)km/sphys.velocfloatJ/MNRAS/491/2834/table1Photometric data of NGTS-8 from NGTS, SAAO, and EulercamrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleindexedRFluxRelative fluxphot.flux;arith.ratiodoublee_RFluxError on RFluxstat.errordoubleInstInstrument used for the observations (1)instr.setupcharJ/MNRAS/491/2834/table2Photometric data of NGTS-9 from NGTS, SAAO, and EulercamrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleindexedRFluxRelative flux7phot.flux;arith.ratiodoublee_RFluxError on RFluxstat.errordoubleInstInstrument used for the observations (1)instr.setupcharJ/MNRAS/491/2834/table4HARPS and FEROS radial velocities for NGTS-8recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDBJulian Date (-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVError on RVkm/sstat.errorfloatFWHMFull width at half maximumkm/sspect.line.widthfloatBISBisector inverse slopekm/sphys.velocfloatExpTimeExposure timestime.duration;obs.exposureintInstInstrument usedinstr.setupcharJ/MNRAS/491/2834/table5CORALIE radial velocities for NGTS-9recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDBJulian Date (-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVError on RVkm/sstat.errorfloatFWHMFull width at half maximumkm/sspect.line.widthfloatBISBisector inverse slopekm/sphys.velocfloatExpTimeExposure timestime.duration;obs.exposureintInstInstrument usedinstr.setupcharJ/MNRAS/491/2834/table8Planetary properties for NGTS-8b using allesfitterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNamePlanet name (NGTS-8b or NGTS-9b)meta.id;meta.maincharPeriodOrbital perioddtime.perioddoublee_PeriodError on Perioddstat.error;time.perioddoubleTCTransit center time in BJDdtime.epochdoublee_TCError on TCdstat.errordoubleT14Duration of transit (1st to 4th contact) T14htime.durationfloate_T14Error on T14hstat.errorfloata/RsSemi-major axis to star radii ratiophys.size;arith.ratiofloate_a/RsError on a/Rsstat.errorfloatR/RsPlanet to star radii ratiophys.size;arith.ratiofloate_R/RsError on R/Rsstat.errorfloateEccentricitysrc.orbital.eccentricityfloatE_eUpper error on estat.error;stat.maxfloate_eLower error on estat.errorfloatincInclination of the orbitdegsrc.orbital.inclinationfloate_incError on incdegstat.errorfloatMpPlanet mass(1.898187x10+27kg)phys.massfloatE_MpUpper error on Mp(1.898187x10+27kg)stat.error;stat.maxfloate_MpLower error on Mp(1.898187x10+27kg)stat.errorfloatRpPlanet radius(7.1492x10+7m)phys.size.radiusfloate_RpError on Rp(7.1492x10+7m)stat.errorfloatrhopPlanet densityg.cm**-3phys.densityfloatE_rhopUpper error on rhopg.cm**-3stat.error;stat.maxfloate_rhopLower error on rhopg.cm**-3stat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlcharKRadial velocity semi-amplitudem/sphys.veloc;src.orbitalfloate_KError on Km/sstat.errorfloataSemi-major axisAUphys.size.smajAxisfloatE_aUpper error on aAUstat.error;stat.maxfloate_aLower error on aAUstat.errorfloatTeqPlanet equilibrium temperatureKphys.temperatureinte_TeqError on TeqKstat.errorint_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/491/2834/table9Planetary properties for NGTS-9b using allesfittere_PeriodError on Perioddstat.error;time.perioddoubleTCTransit center time in BJDdtime.epochdoublee_TCError on TCdstat.errordoubleT14Duration of transit (1st to 4th contact) T14htime.durationfloate_T14Error on T14hstat.errorfloata/RsSemi-major axis to star radii ratiophys.size;arith.ratiofloate_a/RsError on a/Rsstat.errorfloatR/RsPlanet to star radii ratiophys.size;arith.ratiofloate_R/RsError on R/Rsstat.errorfloatKRadial velocity semi-amplitudem/sphys.veloc;src.orbitalfloate_KError on Km/sstat.errorfloateEccentricitysrc.orbital.eccentricityfloatE_eUpper error on estat.error;stat.maxfloate_eLower error on estat.errorfloatincInclination of the orbitdegsrc.orbital.inclinationfloate_incError on incdegstat.errorfloatMpPlanet mass(1.898187x10+27kg)phys.massfloatE_MpUpper error on Mp(1.898187x10+27kg)stat.error;stat.maxfloate_MpLower error on Mp(1.898187x10+27kg)stat.errorfloatRpPlanet radius(7.1492x10+7m)phys.size.radiusfloate_RpError on Rp(7.1492x10+7m)stat.errorfloatrhopPlanet densityg.cm**-3phys.densityfloatE_rhopUpper error on rhopg.cm**-3stat.error;stat.maxfloate_rhopLower error on rhopg.cm**-3stat.errorfloataSemi-major axisAUphys.size.smajAxisfloatE_aUpper error on aAUstat.error;stat.maxfloate_aLower error on aAUstat.errorfloatTeqPlanet equilibrium temperatureKphys.temperatureinte_TeqError on TeqKstat.errorint_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNamePlanet name (NGTS-8b or NGTS-9b)meta.id;meta.maincharPeriodOrbital perioddtime.perioddoubleJ/MNRAS/491/2834/table10A summary of the mass-radius model for NGTS-8b with radius 1.09+/-0.03R_J_MpMinimum mass of the planet(1.898187x10+27kg)phys.masscharAgeminAge range of the system (minimum value or value if no maximum indicated)Gyrtime.agefloatfMassmin? Minimum mass fraction of heavy materialphys.mass;stat.minfloatnullableAgemax? Age range of the system (maximum value)Gyrtime.agefloatnullablefMassmax? Maximum mass fraction of heavy materialphys.mass;stat.maxfloatnullableMcoremin? Minimum core mass%phys.mass;arith.ratiointnullableMcoremax? Maximum core mass%phys.mass;arith.ratiointnullableRpminMinimum planet radius(7.1492x10+7m)phys.size.radiusfloatRpmaxMaximum planet radius(7.1492x10+7m)phys.size.radiusfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintModelMass-radius model usedinstr.setup;meta.modelledcharSepOrbital separationAUpos.angDistancefloatJ/MNRAS/491/2834/table11A summary of the mass-radius model for NGTS-9b with radius 1.07+/-0.06R_J_recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintModelMass-radius model usedinstr.setup;meta.modelledcharMpMinimum mass of the planet(1.898187x10+27kg)phys.masscharSepOrbital separationAUpos.angDistancefloatAgeminAge range of the system (minimum value or value if no maximum indicated)Gyrtime.agefloatAgemax? Age range of the system (maximum value)Gyrtime.agefloatnullablefMassmin? Minimum mass fraction of heavy materialphys.mass;stat.minfloatnullablefMassmax? Maximum mass fraction of heavy materialphys.mass;stat.maxfloatnullableMcoremin? Minimum core mass%phys.mass;arith.ratiointnullableMcoremax? Maximum core mass%phys.mass;arith.ratiointnullableRpminMinimum planet radius(7.1492x10+7m)phys.size.radiusfloatRpmaxMaximum planet radius(7.1492x10+7m)phys.size.radiusfloat