J/MNRAS/549/G106ivo://CDS.VizieR/J/MNRAS/549/G1061CDSRodel T.Ulmer-Moll S.Gill S.Watson C.A.Eschen Y.N.E.,Freckelton A.V.Mortier A.Collins K.A.Dragomir D.Essack Z.,Skinner B.Mallaghan N.Wheatley P.Anderson D.R.Apergis I.,Barkaoui K.Battley M.P.Bayliss D.Bouchy F.Bryant E.M.,Burleigh M.R.Cadell B.M.J.Carlier S.J.Carteret Y.Casewell S.L.,Claringbold A.B.Costes J.C.Davies B.D.R.Doyle L.Evans P.,Fernandez Fernandez J.Fontanet E.Gillen E.Goad M.R.Harvey G.,Hawthorn F.Hobbs K.L.Hobson M.Isopi G.Jenkins J.S.Kendall A.,Kipping D.Lendl M.Mallia F.Mann C.McCormac J.de Mooij E.J.W.,Moyano M.Nigioni A.Odeh M.Passeger V.M.Saha S.Schwarz R.P.,Sedgley A.Shporer A.Soubkiou A.Udry S.Veras D.Vignes J.P.,Villanueva S. Jr.Vines J.I.West R.Wilson T.G. Worters H.L.,Young M.E.Zapparata A.2026-06-26T13:55:49Z2026-06-26T14:35:46ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsdwarf-starsradial-velocityphotometryvisible-astronomyWe present the discovery of TIC-65910228 b / NGTS-38 b, a giant exoplanet with a radius of 1.081+/-0.047 RJ and a mass of 4.78^+0.39^_-0.37_MJ on a long period (180.52797+/-0.00036 day), moderately eccentric (e=0.3086+/-0.010) orbit transiting a bright (V=10.230+/-0.020 mag) metal rich ([Fe/H]=0.33+/-0.09dex) F6V-F7V type host star. The planet was initially detected from a single transit in TESS Sector 33. A photometric monitoring campaign of 228 nights with NGTS detected a transit egress of the planet, which together with spectroscopic radial velocity monitoring with CORALIE and HARPS identified an orbital period of ~180.5d. These radial velocity measurements also showed the mass of the companion to be planetary. Additional transit observations coordinated by the TESS follow-up observing program allowed further confirmation and refinement of this period. With its relatively cool equilibrium temperature of 457+/-11K, NGTS-38 b joins a small but growing population of well characterised transiting warm-Jupiters and has one of the longest periods of any discovered to date. The target is situated in the LOPS2 field of the upcoming PLATO mission which will allow for greater refinement of the system parameters and potential for the discovery of additional companions too small and/or too long-period to be seen by TESS or NGTS. NGTS-38 b's bright host star and wide orbital separation make it an attractive target for further study, including potential measurement of its spin-orbit alignment or targeted exomoon/ring searches.2026MNRAS.549g1061Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/549/G1061CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/549/G1061https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/549/G1061http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/549/G1061https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/549/G1061https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/549/G1061http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/549/G1061GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/549/G1061/tablea1NGTS photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRunNo[1/5] Numbered run of datameta.id;obsintCameraIDID of telescope used for observationsmeta.id;instr.setupintActionIDID of individual nightmeta.idintBJDBarycentric Julian Datedtime.epochdoubleindexedAirmassAirmassobs.airMassdoubleFluxTarget flux / master comparison fluxphot.flux.density;em.optdoublee_Flux[] Error in Fluxstat.error;phot.fluxdoubleFluxNormFlux column normalised per runphot.flux;arith.ratiodoublee_FluxNorm[] Error in FluxNormstat.errordoubleSkyBgTotal sky electron count for exposureinstr.backgrounddoubleFWHMFull Width half maximum in pixelspixspect.line.widthfloatJ/MNRAS/549/G1061/tableb1aFirst CORALIE radial velocity timeseries (CORALIE14)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Datedtime.epochdoubleRVRadial velocitym/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorm/sstat.errordoubleFWHMCCF Full Width Half Maximumm/sspect.line.widthdoublee_FWHMCCF Full Width Half Maximum errorm/sstat.error;phys.angSizedoubleBISspanBisector Inverse Slopem/sphys.velocdoublee_BISspanBisector Inverse Slope errorm/sstat.errordoubleContrastCCF contrastphot.flux;arith.ratiodoublee_ContrastCCF contrast errorstat.errordoubleSMWMount Wilson indexphot.flux;arith.ratiodoublee_SMWMount Wilson index errorstat.errordoubleHaHydrogen alpha indexmeta.codedoublee_HaHydrogen alpha index errorstat.errordoubleNaSodium indexspect.indexdoublee_NaSodium index errorstat.errordoubleCaCalcium indexspect.indexdoublee_CaCalcium index errorstat.errordoubleBERVBarycentric radial velocity correctionm/sarith.factor;spect.dopplerVelocdoubleWeight[1] Fitting weightstat.weight;phys.atmol.weightintExptimeExposure time in secondsstime.duration;obs.exposuredoubleSNR62Signal to Noise Ratio of order 62stat.snrfloatAirmassMid exposure airmassobs.airMassdoubleJ/MNRAS/549/G1061/tableb1bSecond CORALIE radial velocity timeseries (CORALIE24)Weight[1] Fitting weightstat.weight;phys.atmol.weightintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Datedtime.epochdoubleRVRadial velocitym/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorm/sstat.errordoubleFWHMCCF Full Width Half Maximumm/sspect.line.widthdoublee_FWHMCCF Full Width Half Maximum errorm/sstat.error;phys.angSizedoubleBISspanBisector Inverse Slopem/sphys.velocdoublee_BISspanBisector Inverse Slope errorm/sstat.errordoubleContrastCCF contrastphot.flux;arith.ratiodoublee_ContrastCCF contrast errorstat.errordoubleSMWMount Wilson indexphot.flux;arith.ratiodoublee_SMWMount Wilson index errorstat.errordoubleHaHydrogen alpha indexmeta.codedoublee_HaHydrogen alpha index errorstat.errordoubleNaSodium indexspect.indexdoublee_NaSodium index errorstat.errordoubleCaCalcium indexspect.indexdoublee_CaCalcium index errorstat.errordoubleBERVBarycentric radial velocity correctionm/sarith.factor;spect.dopplerVelocdoubleExptimeExposure time in secondsstime.duration;obs.exposuredoubleSNR62Signal to Noise Ratio of order 62stat.snrfloatAirmassMid exposure airmassobs.airMassdoubleJ/MNRAS/549/G1061/tableb2HARPS radial velocity timeseriesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Datedtime.epochdoubleRVRadial velocitym/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorm/sstat.errorfloatFWHMCCF Full Width Half Maximumm/sspect.line.widthdoublee_FWHMCCF Full Width Half Maximum errorm/sstat.error;phys.angSizefloatBISspanBisector Inverse Slopem/sphys.velocfloate_BISspanBisector Inverse Slope errorm/sstat.errorfloatContrastCCF contrastphot.flux;arith.ratiodoublee_ContrastCCF contrast errorstat.errordoublelogRHKlog R'_HK_ activity indicatorphot.flux;arith.ratiodoublee_logRHKlogRHK errorstat.errordoubleBERVBarycentric radial velocity correctionarith.factor;spect.dopplerVelocdoubleHaHydrogen alpha indexmeta.codedoublee_HaHydrogen alpha errorstat.errordoubleNaSodium indexspect.indexdoublee_NaSodium index errorstat.errordoubleCaCalcium indexspect.indexdoublee_CaCalcium index errorstat.errordoubleExptimeExposure time in secondsstime.duration;obs.exposuredoubleSNR64Signal to Noise Ratio of order 64stat.snrdoubleSNR10? Signal to Noise Ratio of order 10stat.snrdoublenullableAirmassMid exposure airmassobs.airMassdouble