J/AJ/168/41ivo://CDS.VizieR/J/AJ/168/41doi:10.26093/cds/vizier.51680041CDSThao Pa C.Mann A.W.Barber M.G.Kraus A.L.Tofflemire B.M.,Bush J.L.Wood M.L.Collins K.A.Vanderburg A.Quinn S.N.Zhou G.,Newton E.R.Ziegler C.Law N.Barkaoui K.Pozuelos F.J.,Timmermans M.Gillon M.Jehin E.Schwarz R.P.Gan T.Shporer A.,Horne K.Sefako R.Suarez O.Mekarnia D.Guillot T.Abe L.,Triaud A.H.M.J.Radford D.J.Lopez Murillo A.I.Ricker G.R.Winn J.N.,Jenkins J.M.Bouma L.G.Fausnaugh M.Guerrero N.M.Kunimoto M.2025-11-12T20:03:55Z2024-10-11T12:23:15ZCDS support team

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

cds-question@unistra.frstellar-associationsradial-velocityline-intensitiesvisible-astronomyspectroscopyphotometryYoung (<500Myr) planets are critical to studying how planets form and evolve. Among these young planetary systems, multiplanet configurations are particularly useful, as they provide a means to control for variables within a system. Here, we report the discovery and characterization of a young planetary system, TOI-1224. We show that the planet host resides within a young population we denote as MELANGE-5. By employing a range of age-dating methods-isochrone fitting, lithium abundance analysis, gyrochronology, and Gaia excess variability-we estimate the age of MELANGE-5 to be 210+/-27Myr. MELANGE-5 is situated in close proximity to previously identified younger (80-110Myr) associations, Crius 221 and Theia 424/Volans-Carina, motivating further work to map out the group boundaries. In addition to a planet candidate detected by the TESS pipeline and alerted as a TESS object of interest, TOI-1224 b, we identify a second planet, TOI-1224 c, using custom search tools optimized for young stars (Notch and LOCoR). We find that the planets are 2.10+/-0.09R_{Earth}_ and 2.88+/-0.10R_{Earth}_ and orbit their host star every 4.18 and 17.95 days, respectively. With their bright (K=9.1mag), small (R*=0.44R_{sun}_), and cool (Teff=3326K) host star, these planets represent excellent candidates for atmospheric characterization with JWST.2024AJ....168...41Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/168/41CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/A+A/460/695 : Search for Assoc. Containing Young stars (Torres+, 2006)J/ApJS/197/8 : Kepler's cand. multiple transiting planets (Lissauer+, 2011)J/A+A/553/A49 : WASP-19b secondary eclipses (Abe+, 2013)J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+, 2013)J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)J/MNRAS/443/2561 : CONCH-SHELL catalog of nearby M dwarfs (Gaidos+, 2014)J/ApJ/788/81 : BANYAN III. RVel & rotation of low-mass stars (Malo+, 2014)J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)J/AJ/152/114 : Pleiades members with K2 light curves. II. (Rebull+, 2016)J/ApJ/834/17 : Mass & rad. of planets, moons, low mass stars (Chen+, 2017)J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)J/AJ/154/224 : Planets in young clusters from K2 (Rizzuto+, 2017)J/AJ/153/101 : Pleiades members stellar properties (Somers+, 2017)J/ApJ/855/115 : Lithium abundances of KOIs from CKS spectra (Berger+, 2018)J/AJ/155/173 : K2 light curve for K2-231 (Curtis+, 2018)J/ApJ/862/138 : BANYAN. XIII. Nearby young assoc. with Gaia (Gagne+, 2018)J/AJ/155/180 : A catalog of cool dwarf targets for TESS (Muirhead+, 2018)J/AJ/156/102 : TESS Input Catalog & Candidate Target List (Stassun+, 2018)J/AJ/155/235 : Speckle interferometry at SOAR in 2016-17 (Tokovinin+, 2018)J/AJ/155/48 : California-Kepler Survey (CKS). V. (Weiss+, 2018)J/ApJ/879/49 : Rot. periods for Gaia members of NGC 6811 (Curtis+, 2019)J/AJ/158/77 : Members of the Pisces-Eridanus stream (Curtis+, 2019)J/ApJ/879/100 : Rot. periods for Hyades & Praesepe members (Douglas+, 2019)J/A+A/622/A110 : Spectroscopic membership for NGC 3532 (Fritzewski+, 2019)J/ApJ/881/9 : EvryFlare. I. Cool stars's flares (Howard+, 2019)J/ApJ/871/63 : How to constrain your M dwarf. II. Binaries (Mann+, 2019)J/ApJ/904/140 : Ruprecht 147 members & rot. for 5 other cl. (Curtis+, 2020)J/MNRAS/492/1008 : NGTS clusters survey - I. Rot. in Blanco 1 (Gillen+, 2020)J/AJ/159/60 : Flares from stars in TESS sectors 1 & 2 (Gunther+, 2020)J/AJ/160/279 : Untangling the Galaxy. II. Within 3kpc (Kounkel+, 2020)J/AJ/159/57 : HST sp. LCs of Kepler 51b & 51d (Libby-Roberts+, 2020)J/AJ/159/19 : SOAR TESS survey. I. (Ziegler+, 2020)J/A+A/652/A60 : Rotation periods for NGC 3532 (Fritzewski+, 2021)J/ApJS/254/39 : Exoplanet cand. from TESS first 2yr obs (Guerrero+, 2021)J/AJ/161/277 : Sample of 45 H{alpha}EW outliers (Kiman+, 2021)J/AJ/161/65 : THYME. IV. 3 Exoplanets around TOI-451 B (Newton+, 2021)J/AJ/162/176 : The solar neighborhood. XLVIII. (Paredes+, 2021)J/ApJ/921/167 : Rotators in Praesepe with LCs & Gaia EDR3 (Rampalli+, 2021)J/A+A/649/A3 : Gaia EDR3 photometric passbands (Riello+, 2021)J/AJ/161/171 : THYME. V. A new stellar association (Tofflemire+, 2021)J/AJ/164/88 : THYME. VIII. MELANGE-3 candidate members (Barber+, 2022)J/AJ/164/215 : Candidate members of Cep-Her, RSG-5 and CH-2 (Bouma+, 2022)J/AJ/163/121 : Radial velocity & light curve of Kepler 1627A (Bouma+, 2022)J/A+A/664/A70 : Li depletion in stellar assoc. (Galindo-Guil+, 2022)J/AJ/163/247 : HIRES, PEPSI & TRES RVels of V1298 Tau (Johnson+, 2022)J/AJ/163/156 : THYME. VI. TOI-1227 radial velocity (Mann+, 2022)J/A+A/657/L3 : Rot. periods of Group X candidate members (Messina+, 2022)J/AJ/164/115 : Hunt for Young & Maturing Exoplanets. VII. (Newton+, 2022)J/A+A/664/A156 : Young sub-Neptunes around TOI-2076 LCs (Osborn+, 2022)J/A+A/666/A121 : Cluster target Giraffe HR15N RV precision (Randich+, 2022)J/AJ/166/62 : New HIRES radial velocity data for V1298 Tau (Blunt+, 2023)J/AJ/166/14 : Kinematic for alpha Persei candidate members (Boyle+, 2023)J/AJ/166/175 : Pre- and main sequence stars properties (Fernandes+, 2023)J/A+A/673/A114 : Improving the open cluster census. II. (Hunt+, 2023)J/AJ/165/235 : HARPS-N & ESPRESSO radial velocity for K2-136 (Mayo+, 2023)J/AJ/165/268 : RVel and rotation period of HIP 33069b (Vowell+, 2023)J/AJ/165/85 : THYME. IX. MELANGE-4 association members (Wood+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/168/41https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/168/41http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/168/41https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/168/41https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/168/41http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/168/41GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/168/41/table3 (MELANGE-5 candidate members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/168/41/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/168/41/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/168/41/table3?GETtext/xml+votable180.050000true37.19798-80.89910.0055555555555555566/16993 17017 21076 32800 32827 32838-32839 32860 33079 33133 33160 33340 33397 33418 33564 33802 33841 34097 34159 34180 34194 34198 34208 34366 34509 35026 35037 35185 35228 35440 35447 36906 36910 36920 36956 36967 36972 36982 37011 37036 37038 37074 37117 37134 37148 37208 37410 37427 37441 37450 37566 37714 37737 37998 38002 38188 38658 38765 38953 38978 39008 39043 39075 39398 39432 39614 39747 39799 39801 39804 39859 39889 40966 41007 41017 41061 41065 41075 41088 41100 41167 41175 41181 41206 41215 41268 41272 41292 41314 41332 41391 41426 41468 41481 41517 41524 41543 41559 41561 41672 41784 41889 41996 42068 42093 42271 42450 42888 43055 43095 43335 45168-45169 45198 45200 45255 45267 45351 45388 45433 45447 45475 45482 45590 45605 45607 45612 45621 45624 45672 45674 45785 45794 45982 45987 45994 45996 46000 46009 46097 46303 46658 46671 47148 47161 47166 47171 48236 48393https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/168/41?format=asciiOpticaldefaultJ/AJ/168/41/table3MELANGE-5 candidate membersSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR3Gaia DR3 identifier (source_id)meta.id;meta.mainTIC[9210746/1989423078] TESS Input Catalog IDmeta.id.crosslongRA_ICRSRight Ascension (ICRS) at Epoch=2016.0degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Epoch=2016.0degpos.eq.dec;meta.mainRVel[-44/103]? Radial Velocitykm.s**-1spect.dopplerVelocfloatnullablee_RVel[0.1/39.1]? Uncertainty in RVelkm.s**-1stat.error;spect.dopplerVelocfloatnullableEWLi[-4/157]? Equivalent width, Li 6708{AA}, in milli-Angstroms1e-13mspect.line.eqWidthfloatnullablee_EWLi[9.8/22]? Uncertainty in EWLi1e-13mstat.error;spect.line.eqWidthfloatnullabler_EWLiSource of EWLi (2)meta.ref;spect.line.eqWidthcharProt[0.1/21.1]? Rotational perioddtime.periodfloatnullableq_Prot[0/3]? Rotational Period quality (3)meta.code.qual;time.periodintnullabler_RVelSource of RVel (1)meta.ref;spect.dopplerVelocchar