J/A+A/590/A13ivo://CDS.VizieR/J/A+A/590/A13doi:10.26093/cds/vizier.35900013CDSElliott P.Bayo A.Melo C.H.F.Torres C.A.O.Sterzik M.F.Quast G.R.,Montes D.Brahm R.2018-03-09T08:12:03Z2016-04-28T09:13:29ZCDS support team

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

cds-question@unistra.frstellar-associationsglobular-star-clustersproper-motionsphotometryline-intensitiesThe young associations offer us one of the best opportunities to study the properties of young stellar and sub-stellar objects and directly image planets thanks to their proximity (<200pc) and age (5-150Myr). However, many previous works have been limited to identifying the brighter, more active members (1Msun) due to photometric survey sensitivities limiting the detections of lower-mass objects. We search the field of view of 542 previously identified members of the young associations to identify wide / extremely wide (1000-100,000au in physical separation) companions. Methods. We have combined 2MASS near-infrared photometry (J, H, K) with proper motion values (from UCAC4, PPMXL, NOMAD) to identify companions in the field of view of known members. We collated further photometry and spectroscopy from the literature and conducted our own high-resolution spectroscopic observations for a sub-sample of candidate members. This complementary information allowed us to assess the efficiency of our method. We identified 84 targets (45:0.2-1.3M_{sun}_, 17:0.08-0.2M_{sun}_, 22:<0.08M_{sun}_) in our analysis, 10 of which have been identified from spectroscopic analysis in previous young association works. For 33 of these 84 we were able to further assess their membership using a variety of properties (X-ray emission, UV excess, H{alpha}, lithium and KI equivalent widths, radial velocities, and CaH indices). We derive a success rate of 76-88% for this technique based on the consistency of these properties. Once confirmed, the targets identified in this work would significantly improve our knowledge of the lower-mass end of the young associations. Additionally, these targets would make an ideal new sample for the identification and study of planets around nearby young stars. Given the predicted sub-stellar mass of the majority of these new candidate members and their proximity, high-contrast imaging techniques would facilitate the search for new low-mass planets.2016A&A...590A..13Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/590/A13CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/460/695 : Search for Associations Containing Young starsJ/A+A/508/833 : SACY III. Li abundances (da Silva+, 2009)J/MNRAS/431/1005 : SACY IV. IC 2391 and Argus young stars (de Silva+, 2013)J/A+A/568/A26 : SACY V. Multiple systems (Elliott+, 2014)J/A+A/580/A88 : SACY VI. Stellar multiplicity in 3-1000AU (Elliott+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/590/A13https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/590/A13http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/590/A13https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/590/A13https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/590/A13http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/590/A13GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/590/A13/appene (Properties of new candidate members (full table4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/590/A13/appene?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/590/A13/appene?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/590/A13/appene?GETtext/xml+votable180.050000true7.60717-62.60040.005555555555555556Cone search capability for table J/A+A/590/A13/tabled1 (Basic properties of the original used in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/590/A13/tabled1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/590/A13/tabled1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/590/A13/tabled1?GETtext/xml+votable180.050000true4.58708330.9561110.0055555555555555566/17 46 102 114 119 445 447 558-559 601 674 719 765 767 823 826 901 940 1153 1412 1426 1578 1585 1762 1774 1786-1787 1811 1843 2101 2316-2317 2374 2508 2660 2897 2966 3060 3072 3161 3163 4552 5410 5600 6293 6312 6759 6940 7309 7323 7846 7863 7991 8000 8041 8091 8094 8752 9331 9726 10203 10771 10897 11170 12013 12253 12436 12713 12770 13051 13186 13450 13512 13674 13688 14502 15098 15207 15261 15325 15372 15686 15788 16393 16426 16543 16853 16930 16993 17124 17155 17274 17288 17552 17606-17607 18228 18230-18231 18743 18745 18796-18797 19163 19409 19777 19931 19948 20071 20125 20327 20368 20381 20491-20492 20505 20507-20508 20510 20528 20564 20602 20609-20610 20618 20636-20637 20639 20644-20645 20650 20657-20658 20696 20706 20715 21023 21050 21070 21080 21082-21083 21094 21118 21135 21139 21145 21180 21202 21217 21289 21296 21365 21386 21418 21420 21424 21436 21763 22066-22067 22146 22245 22349 22581 22619 22647 22683 22773 22823 22908 22942 22964 23012 23028 23037 23068 23094 23111 23136 23140 23155 23176 23233 23272 23301 23321 23364 23388 23395 23495 23718 23722 23785 23895 24109 24166 24580 24608 24629 24633 24644 24716 24740 24763 25096 25113 26133 27201 27392 28613 28746 28784 29187 29378 29569 29657 29999 30387 30477 30826 31104 31934 32836 32844 32891 32897 32937 32952 33050 33066 33095 33100 33116 33157 33193 33208 33240 33268 33312 33361 33449 33500 33520 33537 33548 33565 33583 33694 33704 33707 33716 33791 33832 33850 33872 33937 33956 33996 34008 34012 34043 34047 34050 34054 34058 34073-34074 34088 34099 34102 34126 34135 34138 34140 34146 34151 34163-34165 34180 34203 34206 34244-34245 34269 34286 34290 34338 34378 34384-34385 34406 34423 34436 34450 34464 34509 34538 34586 34680 34683 34757 34790 34823 34825 34829-34830 34886 34909 34930 35042 35075 35077 35123 35147 35149 35174 35396 35497 35861 36036 36045 36130 36158 36308 36346 36487 36578 36686 36713 36884 36899 36907 36915 36928 36938 36948 36961 36963 36967 36969 37006 37010 37012 37023 37032 37056 37060 37065 37078 37120 37125 37172 37174 37177 37238 37248 37272 37287 37297 37302 37398 37414 37419 37494 37508 37522 37542 37583 37628 37637 37652 37664 37671 37678 37683 37688-37689 37695 37730 37745 37781 37783-37785 37787-37788 37790-37791 37794 37809-37811 37817 37838 37840 38054 38061 38191 38199 38341 38347 38359 38363 38382 38440 38454 38472 38555 38593 38687 38742 38910 38936 38950 38985-38986 38997 39044 39051 39080 39091 39094 39122-39123 39208 39279 39310 39336 39450 39452 39464 39489 39523-39524 39532 39544 39579 39584 39610 39615-39616 39625 39627 39634 39735 39829 39851 40251 40596 40977 41031 41128 41130-41131 41139 41158 41234 41254 41295 41472 41481 41484 41505 41526 41528 41530 41553 41600 41798 41854 42096 42242 42272 43571 43670 43677 43683 43704 44439 44696 44751 45072 45101 45108 45145 45205 45208 45336 45351 45382 45538 45544 45607 45678 45687 45746 45927 45964 45983 46383 46456 46615 46692 46922 47120 47125 47205 47249 47287 47345 47366 47626 47703 47863 47941 47943 48038 48061 48124 48159 48263 48274 48318 48361 48553 48559 48648 48651 48672 48905 49031 49135 49146https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/590/A13?format=asciidefaultJ/A+A/590/A13/appeneProperties of new candidate members (full table4)JmagJ magnitudemagphot.mag;em.IR.JfloatKmagK magnitudemagphot.mag;em.IR.KfloatAssocAssociation namemeta.id.parentcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS designation (JHHMMSSss+DDMMSSs)meta.id;meta.maincharRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainDistkDistance (kinematic)pcpos.distancedoubleDistp? Distance (parallactic)pcpos.distancedoublenullablepmRAProper motion in right ascensionmas/yrpos.pm;pos.eq.rafloate_pmRAUncertainty of pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in declinationmas/yrpos.pm;pos.eq.decfloate_pmDEUncertainty of pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatr_pmDEReference for proper motion, in refs.dat filemeta.ref;pos.pm;pos.eq.deccharRV? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RV? Uncertainty of RVkm/sstat.errorfloatnullabler_RVReference for radial velocity, in refs.dat filemeta.ref;pos.framecharHmagH magnitudemagphot.mag;em.IR.HfloatEWLi? Lithium equivalent width0.1pmspect.line.eqWidthintnullabler_EWLiReference for lithium equivalent width, in refs.dat filemeta.ref;pos.framecharBmag? B magnitudemagphot.mag;em.opt.Bdoublenullabler_BmagReferences for B magnitude, in refs.dat filemeta.ref;pos.framecharVmag? V magnitudemagphot.mag;em.opt.Vdoublenullabler_VmagReferences for V magnitude, in refs.dat filemeta.ref;pos.framecharRmag? R magnitudemagphot.mag;em.opt.Rdoublenullabler_RmagReferences for R magnitude, in refs.dat filemeta.ref;pos.framecharEWHa? H alpha equivalent width0.1nmspect.line.eqWidth;em.line.Halphafloatnullablee_EWHa? Uncertainty of EWHa0.1nmstat.errorfloatnullabler_EWHaReference for H alpha equivalent width, in refs.dat filemeta.ref;pos.framecharlogLX/Lbol? X-ray/bolometric luminosity ratio (log)phys.luminosity;arith.ratiodoublenullabler_logLX/LbolReference for logLX/Lbol, in refs.dat filemeta.ref;pos.framecharCaH2? Calcium Hydroxide index 2meta.code;spect.indexfloatnullabler_CaH2Reference for CaH2, in refs.dat filemeta.ref;pos.framecharCaH3? Calcium Hydroxide index 3meta.code;spect.indexfloatnullabler_CaH3Reference for CaH3, in refs.dat filemeta.ref;pos.framecharEWNaI? Sodium I equivalent width0.1nmspect.line.eqWidth;em.opt.Ifloatnullabler_EWNaIReference for EWNaI, in refs.dat filemeta.ref;pos.framecharEWKI? Potassium I equivalent width0.1nmspect.line.eqWidth;em.opt.Ifloatnullabler_EWKIReference for EWKI, in refs.dat filemeta.ref;pos.framecharcYouth consistent quantitiesmeta.codecharMemb[YN? ] Membership flagmeta.code.errorcharr_cReferences for youth consistent quantities, in refs.dat filemeta.ref;pos.framecharCata[Y] Optical flaring in Catalina photometrymeta.codecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/590/A13/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/A+A/590/A13/tabled1Basic properties of the original used in this workSimbadNameSimbad column added by the CDSmeta.idcharNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAssocAssociation namemeta.id.parentcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainDistDistancepcpos.distancefloatn_Dist[a] Note on Dist (1)meta.notecharJmagJ magnitudemagphot.mag;em.IR.JfloatHmagH magnitudemagphot.mag;em.IR.HfloatKmagK magnitudemagphot.mag;em.IR.KfloatpmRAProper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRArms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatRefMembership reference (2)pos.framechar