J/ApJ/898/L11ivo://CDS.VizieR/J/ApJ/898/L11doi:10.26093/cds/vizier.18989011CDSGill S.Wheatley P.J.Cooke B.F.Jordan A.Nielsen L.D.Bayliss D.,Anderson D.R.Vines J.I.Lendl M.Acton J.S.Armstrong D.J.Bouchy F.,Brahm R.Bryant E.M.Burleigh M.R.Casewell S.L.Eigmuller P.,Espinoza N.Gillen E.Goad M. RGrieves N.Gunther M.N.Henning T.,Hobson M.J.Hogan A.Jenkins J.S.McCormac J.Moyano M.Osborn H.P.,Pollacco D.Queloz D.Rauer H.Raynard L.Rojas F.Sarkis P.,Smith A.M.S.Tala Pinto M.Tilbrook R.H.Udry S.Watson C.A.West R.G.2022-09-30T21:11:22Z2021-12-30T08:38:19ZCDS support team

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

cds-question@unistra.frexoplanetsk-starsphotometryradial-velocityvisible-astronomyWe report the discovery of NGTS-11 b (=TOI-1847b), a transiting Saturn in a 35.46 day orbit around a mid K-type star (T_eff_=5050+/-80K). We initially identified the system from a single-transit event in a TESS full-frame image light curve. Following 79 nights of photometric monitoring with an NGTS telescope, we observed a second full transit of NGTS-11 b approximately one year after the TESS single-transit event. The NGTS transit confirmed the parameters of the transit signal and restricted the orbital period to a set of 13 discrete periods. We combined our transit detections with precise radial-velocity measurements to determine the true orbital period and measure the mass of the planet. We find NGTS-11 b has a radius of 0.817_-0.032_^+0.028^R_Jup_, a mass of 0.344_-0.073_^+0.092^M_Jup_, and an equilibrium temperature of just 435_-32_^+34^K, making it one of the coolest known transiting gas giants. NGTS-11 b is the first exoplanet to be discovered after being initially identified as a TESS single-transit event, and its discovery highlights the power of intense photometric monitoring in recovering longer-period transiting exoplanets from single-transit events.2020ApJ...898L..11Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/898/L11CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/616/A39 : Power-2 limb-darkening law from STAGGER-grid (Maxted, 2018)J/AJ/157/55 : RVs and light curves for HATS-60-HATS-69 (Hartman+, 2019)J/AJ/159/241 : TESS-Keck Survey. I. HD332231 RVs (Dalba+, 2020)J/MNRAS/495/2713 : TIC-231005575 photometric and RV curves (Gill+, 2020)J/AJ/159/173 : Phot. & RVs of 4 dwarfs hosting giant planets (Hartman+, 2020)J/ApJS/254/39 : Exoplanet candidates from TESS first 2yr obs (Guerrero+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/898/L11https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/898/L11http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/898/L11https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/898/L11https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/898/L11http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/898/L11GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/898/L11/tessTESS light curve (data behind Figure 1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[1382/1409.4] Barycentric Julian Date; BJD-2457000dtime.epochdoubleFlux[0.29/1.01] Normalized Fluxphot.flux;arith.ratiodoubleJ/ApJ/898/L11/ngtsNGTS light curve (data behind Figure 1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2.4587e+06/2.45879e+06] Barycentric Julian Datedtime.epochdoubleindexedmag[-0.378/0.326] Relative magnitudemagphot.magfloate_mag[0.0075/0.008] Uncertainty in magmagstat.error;phot.magfloatJ/ApJ/898/L11/coralieCORALIE radial velocity time series (data behind Figure 1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[58785.6/58839.6] Barycentric Julian Date in TDB; BJD-2400000.5dtime.epochdoubleHRV[21364/21439] Barycentric radial velocitym/sspect.dopplerVelocdoublee_HRV[48/56] Uncertainty in HRVm/sstat.errordoubleFWHMFWHM of the cross-correlation functionm/sspect.line.widthdoublee_FWHMUncertainty in FWHMm/sstat.error;phys.angSizedoubleBSBisector spanm/sphys.velocdoublee_BSUncertainty in BSm/sstat.errordoubleContrastContrast%stat.fit.paramdoublee_ContrastUncertainty in Contrast%stat.errordoubleHalphaH-alpha indexspect.indexdoublee_HalphaUncertainty in Halphastat.error;spect.linedoubleNaIDNaID indexspect.indexdoublee_NaIDUncertainty in NaIDstat.errordoubleCaHKCaHK indexspect.indexdoublee_CaHKUncertainty CaHKstat.errordoublebeRVBarycentric Earth radial velocitykm/sphys.veloc;pos.barycenterdoubleJ/ApJ/898/L11/ferosFEROS radial velocity time series (data behind Figure 1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[58802.6/58813.7] Barycentric Julian Date in TDB; BJD-2400000.5dtime.epochdoubleHRV[21.35/21.43] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[0.006/0.01] Uncertainty in HRVkm/sstat.errorfloatJ/ApJ/898/L11/harpsHARPS radial velocity time series (data behind Figure 1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[58837.6/58900.6] Barycentric Julian Date in TDB; BJD-2400000.5dtime.epochdoubleHRV[21.38/21.43] Barycentric radial velocitykm/sspect.dopplerVelocdoublee_HRV[0.0028/0.012] Uncertainty in HRVkm/sstat.errordoubleFWHMFWHM of the cross-correlation functionkm/sspect.line.widthdoubleContrastContrast%stat.fit.paramfloatBSBisector spankm/sphys.velocdoubleNoisePhoton Noisekm/sstat.snr;instr.det.noisedoubleSindexMount Wilson S indexspect.indexdoublee_SindexUncertainty in Sindexstat.errordoublelogRHKStellar Activity index, Ca II HKphot.flux;arith.ratiofloate_logRHKUncertainty in logRHKstat.errorfloatsnCaIISignal-to-noise, CaII linestat.snrfloatsn10sn10stat.snrfloatsn50sn50stat.snrfloatsn60sn60stat.snrfloat