J/AJ/165/85ivo://CDS.VizieR/J/AJ/165/85doi:10.26093/cds/vizier/be-55-2nCDSWood M.L.Mann A.W.Barber M.G.Bush J.L.Kraus A.L.Tofflemire B.M.,Vanderburg A.Newton E.R.Feiden G.A.Zhou G.Bouma L.G.Quinn S.N.,Armstrong D.J.Osborn A.Adibekyan V.Mena E.D.Sousa S.G.Gagne J.,Fields M.J.Milburn R.P.Thao Pa C.Schmidt S.P.Gnilka C.L.,Howell S.B.Law N.M.Ziegler C.Briceno C.Ricker G.R.Vanderspek R.,Latham D.W.Seager S.Winn J.N.Jenkins J.M.Schlieder J.E.,Osborn H.P.Twicken J.D.Ciardi D.R.Huang C.X.2026-08-27T08:07:52Z2024-01-12T06:38:56ZCDS support team

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

cds-question@unistra.frstellar-associationsvisible-astronomyspectroscopyradial-velocityWe report the discovery and characterization of a nearby (~85pc), older (27{+/-}3Myr), distributed stellar population near Lower Centaurus Crux (LCC), initially identified by searching for stars comoving with a candidate transiting planet from TESS (HD109833; TOI1097). We determine the association membership using Gaia kinematics, color-magnitude information, and rotation periods of candidate members. We measure its age using isochrones, gyrochronology, and Li depletion. While the association is near known populations of LCC, we find that it is older than any previously found LCC subgroup (10-16Myr), and distinct in both position and velocity. In addition to the candidate planets around HD109833, the association contains four directly imaged planetary-mass companions around three stars, YSES-1, YSES-2, and HD95086, all of which were previously assigned membership in the younger LCC. Using the Notch pipeline, we identify a second candidate transiting planet around HD109833. We use a suite of ground-based follow-up observations to validate the two transit signals as planetary in nature. HD109833 b and c join the small but growing population of <100Myr transiting planets from TESS. HD109833 has a rotation period and Li abundance indicative of a young age (<~100Myr), but a position and velocity on the outskirts of the new population, lower Li levels than similar members, and a color-magnitude diagram position below model predictions for 27Myr. So, we cannot reject the possibility that HD109833 is a young field star coincidentally nearby the population.2023AJ....165...85Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/85CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/259 : The Tycho-2 Catalogue (Hog+ 2000)I/337 : Gaia DR1 (Gaia Collaboration, 2016)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)J/A+A/381/446 : Astrometric Radial Velocities. III. (Madsen+, 2002)J/AJ/124/1670 : Post-T Tauri Stars in Sco-Cen Association (Mamajek+, 2002)J/A+A/460/695 : Search Associations Containing Young stars (Torres+, 2006)J/A+A/508/833 : SACY III. Li abundances (da Silva+, 2009)J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011)J/MNRAS/416/3108 : Membership of Sco OB2 moving group (Rizzuto+, 2011)J/A+A/545/A32 : Chemical abundances of 1111 FGK stars (Adibekyan+, 2012)J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)J/ApJ/746/154 : Kinematic parallaxes for Sco-Cen members (Pecaut+, 2012)J/ApJ/762/88 : Young stellar kinematic group candidate member (Malo+, 2013)J/MNRAS/435/1325 : Membership of the {epsilon} Cha association (Murphy+, 2013)J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)J/A+A/556/A150 : SWEETCat I Stellar parameters for host stars (Santos+, 2013)J/MNRAS/434/966 : Measurements of Li in T-Tauri stars (Sergison+, 2013)J/ApJ/791/54 : Nearby M Dwarfs parameters (Gaidos+, 2014)J/AJ/147/146 : Spectroscopy of Tuc-Hor candidate members (Kraus+, 2014)J/A+A/583/A94 : [X/Fe] scatter derived for spectral lines (Adibekyan+, 2015)J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015)J/MNRAS/461/794 : Scorpius-Centaurus K-Type Stars (Pecaut+, 2016)J/ApJ/838/150 : The Taurus-Auriga ecosystem. I. (Kraus+, 2017)J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)J/AJ/154/224 : Transiting planets young clusters from K2 (Rizzuto+, 2017)J/AJ/154/69 : ACRONYM II. {beta} Pictoris Moving Group (Shkolnik+, 2017)J/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018)J/ApJ/868/32 : A large moving group within LCC association (Goldman+, 2018)J/AJ/155/196 : Analysis of K2 LCs for USco & {rho}Oph (Rebull+, 2018)J/AJ/156/102 : TESS Input Catalog & Candidate Target List (Stassun+, 2018)J/AJ/156/259 : Robo-AO detected close binaries in Gaia DR2 (Ziegler+, 2018)J/AJ/157/196 : Close companions around young stars (Kounkel+, 2019)J/ApJ/871/63 : How to constrain M dwarf. II. Nearby binaries (Mann+, 2019)J/A+A/622/L13 : Stellar stream in Gaia DR2 discovery (Meingast+, 2019)J/MNRAS/492/431 : Planetary-mass companion to a solar-type star (Bohn+, 2020)J/A+A/634/A136 : Chemical S2- abundances of 719 FGKstars (Costa Silva+, 2020)J/ApJ/903/96 : The {mu}Tau Association (MUTA) (Gagne+, 2020)J/A+A/643/A71 : Members for 20 open clusters (Gutierrez Albarran+, 2020)J/AJ/159/19 : SOAR TESS survey. I. (Ziegler+, 2020)J/A+A/648/A73 : Discovery of directly imaged planet YSES 2b (Bohn+, 2021)J/AJ/161/24 : TRICERATOPS predictions for 384 TOIs (Giacalone+, 2021)J/ApJS/254/39 : Exoplanet candidates from TESS 1st 2yr obs (Guerrero+, 2021)J/ApJ/917/23 : SPYGLASS. I. Mapping young stellar structures (Kerr+, 2021)J/AJ/162/110 : GaiaEDR3 census of Taurus-Auriga comp (Krolikowski+, 2021)J/ApJ/921/167 : Rotators Praesepe with K2 LCs & Gaia EDR3 (Rampalli+, 2021)J/A+A/649/A3 : Gaia EDR3 photometric passbands (Riello+, 2021)J/AJ/161/171 : THYME. V. Discovering a stellar assoc. (Tofflemire+, 2021)J/AJ/163/275 : Theia 456; stellar stream in Milky Way disk (Andrews+, 2022)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/ApJ/924/84 : {lambda} Orionis PMS stars with Gaia & SPOTS (Cao+, 2022)J/A+A/664/A105 : Stellar content of the ROSAT all-sky survey (Freund+, 2022)J/AJ/163/156 : THYME. VI. TOI-1227 radial velocity (Mann+, 2022)J/A+A/657/L3 : Rotation periods Group X candidate members (Messina+, 2022)J/AJ/164/115 : TESS Hunt Young & Maturing Exoplanets. VII. (Newton+, 2022)J/AJ/163/68 : Fiducial stellar spectrum of HD 63433 (Zhang+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/165/85https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/165/85http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/165/85https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/165/85https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/165/85http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/165/85GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/165/85/table5 (Members of MELANGE-4)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/165/85/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/165/85/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/165/85/table5?GETtext/xml+votable180.050000true165.7359044-84.48538440.0055555555555555566/36886 36930 36943 36951 36980 37056 37063 37072 37074-37075 37077 37079 37085-37086 37130 37134 37139-37140 37149 37151 37155 37163 37166-37167 37175 37177 37180 37182 37200 37209-37210 37220 37227 37233 37235 37238 37245-37246 37262 37277 37306 37310-37311 37314 37316 37319 37324-37326 37328 37335-37336 37338-37340 37356 37359 37362 37368 37440 37693 37714 37765 37890 37894-37895 37901 37908-37909 37912 37915 37917 37921-37922 37928 37932 37936 37946 37952 37955 38000 38160 40963 40969 40985 41101 41106 41117 41119 41139-41140 41152 41169 41173 41184 41191-41192 41197 41308 41349 41356 41370 41380 41382 41384 41389 41399 41411 41416 41446 41452 41458 41465 41468 41475 41484-41485 41489 41498 41501 41503 41510 41513 41525 41530 41542 41544 41547 41550 41557-41558 41598 41606 41613 41615-41616 41626 41629 41632 41634 41637 41641 41644 41656-41657 41660 41662 41664 41666 41668 41670 41674 41680 41682 41698 41701-41702 41704 41708 41710 41713 41715 41718-41719 41721-41722 41726-41727 41741 41743-41745 41748-41749 41758 41773 41778-41779 41794 41802 41816 41819 41857 41860 41864 41866 41918 41952 42155 43009-43010 43012-43013 43016 43019 43021-43022 43024 43028-43029 43031 43033 43035 43037-43039 43042 43044-43045 43047 43049 43057-43060 43068 43070 43072-43074 43079-43080 43082 43085 43087 43089 43091 43097-43098 43101 43103 43105 43107 43110 43113 43118 43124 43137 43141 43144 43152 43154-43155 43158 43161 43163 43208-43210 432341.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/165/85?format=asciiOpticaldefaultJ/AJ/165/85/table1Radial velocity measurements of HD 109833recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstTelescope usedmeta.id;instrcharBJD[2458858/2459743] Barycentric Julian Datedtime.epochdoubleRVel[10.5/11] Radial velocitykm/sspect.dopplerVelocfloate_RVel[0.002/0.3] Error on RVelkm/sstat.error;spect.dopplerVelocfloatJ/AJ/165/85/table5Members of MELANGE-4recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia DR3 (I/355) identifiermeta.id;meta.mainRAdeg[121/264] Right Ascension (ICRS) at Ep=2016.0degpos.eq.raDEdeg[-88/-49] Declination (ICRS) at Ep=2016.0degpos.eq.decplx[8.3/19.8] Gaia DR3 parallaxmaspos.parallax.trigfloatRUWE[0.72/63.7] Gaia RUWE valuestat.errorfloatGmag[4.48/19] Gaia DR3 G-band magnitudemagphot.mag;em.opt.VfloatBP-RP[-0.13/4.83] Gaia DR3 (Blue-Red) passband colormagphot.color;em.opt.B;em.opt.RfloatKsmag[4.64/13.86]? 2MASS K_s_ band magnitudemagphot.mag;em.IR.KfloatnullableRVel[-9.04/26.1]? Gaia DR3 radial velocitykm/sspect.dopplerVelocfloatnullablee_RVel[0.1/39]? Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatnullableProb[0.5/1] BANYAN derived probabilitystat.probabilityfloatPRot[0.1/20.6]? Rotational period from TESS datadtime.periodfloatnullableq_PRot[-2/3]? Quality value on PRotmeta.code.qualintnullableTIC? TESS Input Catalog identifiermeta.id.crossnullableHIP? Hipparcos identifiermeta.id.crossintnullableFFIdentified in original search for "friend" stars ? (1)meta.codechar_RAPosition from Gaia DR3 (I/355) (right ascension part)degpos.eq.ra;meta.main_DEPosition from Gaia DR3 (I/355) (declination part)degpos.eq.dec;meta.main