J/ApJ/945/119ivo://CDS.VizieR/J/ApJ/945/119doi:10.26093/cds/vizier.19450119CDSGagne J.Moranta L.Faherty J.K.Kiman R.Couture D.Larochelle A.R.,Popinchalk M.Morrone D.2026-02-10T20:05:38Z2025-03-24T08:55:58ZCDS support team

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

cds-question@unistra.frstellar-associationsinfrared-photometryvisible-astronomyyoung-stellar-objectsradial-velocityproper-motionsWe report the discovery of the Oceanus moving group, a ~500Myr old group with 50 members and candidate members at distances 2-50pc from the Sun, using an unsupervised clustering analysis of nearby stars with Gaia DR3 data. This new moving group includes the nearest brown dwarf WISE J104915.57-531906.1 AB (Luhman 16 AB) at a distance of 2pc, which was previously suspected to be young (600-800Myr) based on a comparison of its dynamical mass measurements with brown dwarf evolutionary models. We use empirical color-magnitude sequences, stellar activity, and gyrochronology to determine that this new group is roughly coeval with the Coma Ber open cluster, with an isochronal age of 510+/-95Myr. This newly discovered group will be useful to refine the age and chemical composition of Luhman 16 AB, which is already one of the best substellar benchmarks known to date. Furthermore, the Oceanus moving group is one of the nearest young moving groups identified to date, making it a valuable laboratory for the study of exoplanets and substellar members, with eight brown dwarf candidate members already identified here.2023ApJ...945..119Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/945/119CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/123 : Dwarf K and M stars of small proper motion (Stephenson 1986)IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)I/297 : NOMAD Catalog (Zacharias+ 2005)III/254 : 2nd Cat. of RVel with Astrometric Data (Kharchenko+, 2007)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)I/329 : URAT1 Catalog (Zacharias+ 2015)I/345 : Gaia DR2 (Gaia Collaboration, 2018)III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)II/365 : CatWISE2020 catalog (updated version 28-Jan-2021) (Marocco+, 2021)I/355 : Gaia DR3 Part 1. 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(Dupuy+, 2012)J/ApJ/753/156 : T/Y brown dwarfs with WISE photometry (Kirkpatrick+, 2012)J/AJ/143/103 : New white dwarfs (Sayres+, 2012)J/AJ/143/80 : Low-mass stars of beta Pic & AB Dor (Schlieder+, 2012)J/ApJ/758/56 : Young M dwarfs within 25pc. II. Kinematics (Shkolnik+, 2012)J/MNRAS/433/457 : 76 T dwarfs from the UKIDSS LAS (Burningham+, 2013)J/ApJS/205/6 : T dwarf population revealed by WISE (Mace+, 2013)J/ApJ/783/122 : AllWISE motion survey (Kirkpatrick+, 2014)J/AJ/147/20 : Spectroscopy of 447 nearby M dwarfs (Newton+, 2014)J/AJ/147/34 : SpeX library of L-type dwarfs (Schneider+, 2014)J/A+A/566/A132 : Teff and L for stars in 7 open clusters (Silaj+, 2014)J/A+A/583/A85 : Binaries in beta Pic moving group (Alonso-Floriano+, 2015)J/ApJ/798/73 : BANYAN All-Sky Survey (BASS) cat. V. YMGs (Gagne+, 2015)J/A+A/581/A73 : Luhman 16AB X-shooter spectra (Lodieu+, 2015)J/ApJS/225/10 : Kinematic analysis of M7-L8 dwarfs (Faherty+, 2016)J/ApJ/833/96 : Hawaii IR plx program. II. Ultracool dwarfs (Liu+, 2016)J/A+A/596/A116 : Radial velocities of K-M dwarfs (Sperauskas+, 2016)J/MNRAS/469/2102 : White dwarf population from the SDSS DR12 (Anguiano+, 2017)J/ApJ/838/73 : BD* surface gravities with Keck/NIRSPEC (Martin , 2017)J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)J/A+A/615/A165 : EWs of 13 red giants in IC 4756 (Bagdonas+, 2018)J/ApJS/234/1 : Cat. of M, L, & T dwarfs from PS1 3{pi} Survey (Best+, 2018)J/A+A/616/A108 : Cool stars chromospheric activity cat. (Boro Saikia+, 2018)J/AJ/155/34 : The NIR spectra of neighboring L dwarfs (Cruz+, 2018)J/ApJ/862/138 : BANYAN. XIII. Nearby young assoc. with Gaia (Gagne+, 2018)J/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018)J/AJ/155/39 : Variability data of TIC sources with KELT (Oelkers+, 2018)J/A+A/619/L8 : Ultra-cool dwarfs candidates in Gaia DR2 (Reyle, 2018)J/A+A/616/A7 : Gaia DR2 RVel standard stars cat. (Soubiran+, 2018)J/A+A/621/A126 : CARMENES input catalog of M dwarfs. IV. (Diez Alonso+ 2019)J/A+A/623/A72 : Binarity of HIP stars from Gaia pm anomaly (Kervella+, 2019)J/AJ/158/122 : Local structure & SFH of the MW (Kounkel+, 2019)J/ApJS/243/28 : M-type star magnetic activities (Lu+, 2019)J/A+A/627/A4 : Praesepe (NGC 2632) and its tidal tails (Roeser+, 2019)J/A+A/621/L2 : Hyades tidal tails revealed by Gaia DR2 (Roeser+, 2019)J/ApJ/877/12 : Coma Ber & Neighbor Stellar Group tidal tails (Tang+, 2019)J/ApJ/901/93 : Model atm. analysis of hot WDs from SDSSDR12 (Bedard+, 2020)J/AJ/159/257 : Hawaii IR plx prog. IV. L0-T8 BDs with UKIRT (Best+, 2020)J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)J/A+A/636/A36 : Absolute RVel of CARMENES M dwarfs (Lafarga+, 2020)J/A+A/636/A74 : HARPS radial velocity database (Trifonov+, 2020)J/AJ/160/38 : Spitzer var. detections of 79 brown dwarfs (Vos+, 2020)J/AJ/161/42 : Volume-limited sample of cool dwarfs. I. L0-T8 (Best+, 2021)J/MNRAS/508/3877 : Catalogue of white dwarfs in Gaia EDR3 (Gentile+, 2021)J/ApJ/917/23 : SPYGLASS. I. Mapping young stellar structures (Kerr+, 2021)J/ApJS/253/7 : A full-sky census of BDs within 20pc (Kirkpatrick+, 2021)J/A+A/652/A28 : Activity across the M dwarf domain (Lafarga+, 2021)J/ApJS/254/20 : Stellar groups in Taurus from Gaia DR2 & LAMOST (Liu+, 2021)J/A+A/664/A70 : Lithium depletion boundary in assoc. (Galindo-Guil+, 2022)J/A+A/657/L3 : Rot. periods of Group X candidate members (Messina+, 2022)J/ApJ/939/94 : New assoc. in Gaia DR3 solar neighborhood (Moranta+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/945/119https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/945/119http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/945/119https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/945/119https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/945/119http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/945/119GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/945/119/members (Members and candidate members of the Oceanus moving group (Table 1) and kinematics (Table 2) and space velocities of the Oceanus moving group (Table 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/945/119/members?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/945/119/members?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/945/119/members?GETtext/xml+votable180.050000true135.404323649.73682780.005555555555555556Cone search capability for table J/ApJ/945/119/table3 (Radial velocities of the Oceanus moving group)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/945/119/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/945/119/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/945/119/table3?GETtext/xml+votable180.050000true135.403737549.736255560.0055555555555555566/819 946 2044 2800 3535 3979 4038 5212 5413 5464 5551 5950 5972 6647 6809 7185 7217 8483 8518 9564 9986 10138 10313 10586 10654 10861 10983 12984 14765 14807 15086 15806 15857 16230 22289 26281 26421 27746 28122 28404 28767 28922 29032 29088 29358 29436 29678 29693 30438 30525 30604 30648 30656 30850 31107 31254 31401 31405 31434 31444 31601 31741 31998 32077-32078 32197 32207 32284 32440 32715 38039 42463 444561.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/945/119?format=asciiOpticalInfrareddefaultJ/ApJ/945/119/membersMembers and candidate members of the Oceanus moving group (Table 1) and kinematics (Table 2) and space velocities of the Oceanus moving group (Table 4)SimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNrvNumber of rv measurements (link to Table 3)meta.numberintnullableNameIdentifiermeta.id;meta.maincharprimaryf_Name[d] d=likely an unresolved binary starmeta.codecharGaia? Gaia DR3 identifiermeta.idnullableTypeMember type code (G2)meta.code.membercharOriginOrigin of the sample (1)meta.codecharSpTypeSpectral type (2)src.spTypecharRAJ2000Hour of Right Ascension (J2000) (G1)pos.eq.raDEJ2000Degree of Declination (J2000) (G1)pos.eq.decGmag[5.6/21]? Gaia DR3 G band magnitudemagphot.mag;em.optfloatnullableW1mag[3.9/16.5]? WISE 3.4 micron band magnitudemagphot.mag;em.IR.3-4umfloatnullableYouthSign(s) of youth (3)meta.codeDelUW[0.3/19.4]? Total space velocity difference (4)km/sphys.veloc;arith.difffloatnullableObsObservables (5)meta.codecharAssocBest matching BANYAN {Sigma} association (6)meta.id.parentcharl_PMmUpper limit flag on PMmmeta.code.errorcharPMm[22/99.9]? Best matching BANYAN {Sigma} association membership probabilitystat.probability;meta.code.memberfloatnullableRejReason(s) for rejection (7)meta.codecharRef[1/28] Reference code (see refs.dat file)meta.refintpmRA[-2755/254]? Proper motion along RA times cosDEmas/yrpos.pm;pos.eq.radoublenullablee_pmRA[0.01/20]? Uncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE[-446/359]? Proper motion along DEmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE[0.01/20]? Uncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullableRVel[-40.1/26]? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RVel[0.04/6]? Uncertainty in RVelkm/sstat.error;phys.veloc;pos.heliocentricfloatnullableo_RVel[1/113]? Number of observations in RVel (8)meta.number;phys.veloc;pos.heliocentricintnullableplx[14.26/501]? Parallaxmaspos.parallax.trigfloatnullablee_plx[0.01/3]? Uncertainty in plxmasstat.error;pos.parallax.trigfloatnullableRUWE[0.8/6.5]? Gaia DR3 RUWE valuestat.errorfloatnullabler_Pos[31/36]? Coordinate reference (see refs.dat file)meta.refintnullabler_pm[31/40]? Reference code for proper motions (see refs.dat file)meta.ref;pos.pmintnullabler_plx[31/40]? Reference code for plx (see refs.dat file)meta.ref;pos.parallax.trigintnullableX[-42.6/69.2]? Galactic X coordinate, centered on Sun & positive towards the Galactic centerpcpos.cartesian.x;pos.galacticdoublenullablee_X[0.0001/5]? Uncertainty in Xpcstat.error;pos.cartesian.x;pos.galacticfloatnullableY[-22.6/53.4]? Galactic Y coordinate centered on Sun & positive towards the direction of Galactic rotation, parallel to the Galactic planepcpos.cartesian.y;pos.galacticdoublenullablee_Y[0.0003/5]? Uncertainty in Ypcstat.error;pos.cartesian.y;pos.galacticfloatnullableZ[-17.4/52]? Galactic Z coordinate centered on Sun & positive outside the Galactic plane in the North Galactic hemisphere, normal to the Galactic plane such that XYZ form a right-handed coordinate system.pcpos.cartesian.z;pos.galacticdoublenullablee_Z[0.0001/2]? Uncertainty in Zpcstat.error;pos.cartesian.z;pos.galacticfloatnullableU[-34.2/-7.7]? Velocity towards Galactic center (rate of change in X), relative to the Solar motionkm/sphys.veloc;pos.galacticfloatnullablee_U[0.01/5]? Uncertainty in Ukm/sstat.error;phys.veloc;pos.galacticfloatnullableV[-32.1/-16]? Velocity along Galactic rotation (rate of change in Y), relative to the Solar motionkm/sphys.veloc.rotat;pos.galacticfloatnullablee_V[0.01/4]? Uncertainty in Vkm/sstat.error;phys.veloc.rotat;pos.galacticfloatnullableW[-15/0.2]? Velocity normal to the Galactic plane toward North Galactic hemisphere (rate of change in Z), relative to the Solar motionkm/sphys.veloc;pos.cartesian.zfloatnullablee_W[0.01/3]? Uncertainty in Wkm/sstat.error;phys.veloc;pos.cartesian.zfloatnullable_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/ApJ/945/119/table3Radial velocities of the Oceanus moving grouprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifiermeta.id;meta.maincharGaiaGaia DR3 identifiermeta.idTypeMember type code (G2)meta.code.membercharRAJ2000Hour of Right Ascension (J2000) (G1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (G1)pos.eq.dec;meta.mainRVel[-40.1/30] Radial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVel[0.0003/6] Uncertainty in RVelkm/sstat.error;phys.veloc;pos.heliocentricfloato_RVel[1/55] Number of observations in RVelmeta.number;phys.veloc;pos.heliocentricintEpoch[1996/2018.2]? Fractional year of the observation on which the radial velocity measurement is basedyrtime.epochdoublenullableRef[41/58] Reference code (see refs.dat file)meta.refint