J/A+A/645/A30ivo://CDS.VizieR/J/A+A/645/A30doi:10.26093/cds/vizier.36450030CDSZuniga-Fernandez S.Bayo A.Elliott P.Zamora C.Corvalan G.,Haubois X.Corral-Santana J.M.Olofsson J.Huelamo N.Sterzik M.F.,Torres C.A.O.Quast G.R.Melo C.H.F.2021-09-09T12:39:04Z2020-12-25T10:35:12ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starspre-main-sequence-starsNearby young associations offer one of the best opportunities for a detailed study of the properties of young stellar and substellar objects thanks to their proximity (<200pc) and age (~5-150Myr). Previous works have identified spectroscopic (<5au) binaries, close (5-1000au) visual binaries, and wide or extremely wide (1000-100000au) binaries in the young associations. Inmost of the previous analyses, single-lined spectroscopic binaries (SB1) were identified based on radial velocities variations. However, this apparent variation may also be caused by mechanisms unrelated to multiplicity. We seek to update the spectroscopy binary fraction of the Search for Associations Containing Young stars (SACY) sample, taking into consideration all possible biases in our identification of binary candidates, such as activity and rotation. Using high-resolution spectroscopic observations, we produced ~1300 cross-correlation functions (CCFs) to disentangle the previously mentioned sources of contamination. The radial velocity values we obtained were cross-matched with the literature and then used to revise and update the spectroscopic binary (SB) fraction in each object of the SACY association. In order to better describe the CCF profile, we calculated a set of high-order cross-correlation features to determine the origin of the variations in radial velocities. We identified 68 SB candidates from our sample of 410 objects. Our results hint that at the possibility that the youngest associations have a higher SB fraction. Specifically, we found sensitivity-corrected SB fractions of 22^+15^_-11_% for {epsilon} Cha, 31^+16^_-14_% for TW Hya and 32^+9^_-8_% for {beta} Pictoris, in contrast to the five oldest associations we have sampled (~35-125Myr) which are ~10% or lower. This result seems independent of the methodology used to asses membership to the associations. The new CCF analysis, radial velocity estimates, and SB candidates are particularly relevant for membership revision of targets in young stellar associations. These targets would be ideal candidates for follow-up campaigns using high-resolution techniques to confirm binarity, resolve orbits, and, ideally, calculate dynamical masses. Additionally, if the results on the SB fraction in the youngest associations were confirmed, it could hint at a non-universal multiplicity among SACY associations.2021A&A...645A..30Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/645/A30CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/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)J/A+A/590/A13 : SACY VII. New candidate members in young associationshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/645/A30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/645/A30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/645/A30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/645/A30https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/645/A30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/645/A30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/645/A30/sacysb (presented in this work (table G4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/645/A30/sacysb?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/645/A30/sacysb?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/645/A30/sacysb?GETtext/xml+votable180.050000true144.964005-21.57140.005555555555555556Cone search capability for table J/A+A/645/A30/rvindi (Individual radial velocities values calculated in this work and compiled from the literature/Gaia DR2 for 590 stars (table G1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/645/A30/rvindi?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/645/A30/rvindi?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/645/A30/rvindi?GETtext/xml+votable180.050000true144.964005-21.57140.005555555555555556Cone search capability for table J/A+A/645/A30/rotvel (Individual rotational velocity values calculated in this work and compiled from literature for 483 stars (table G2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/645/A30/rotvel?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/645/A30/rotvel?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/645/A30/rotvel?GETtext/xml+votable180.050000true144.964005-21.57140.0055555555555555566/46 102 447 601 674 719 765 940 1153 1412 1762 1787 2374 2660 2966 3163 9331 10203 10771 11170 12436 12770 13450 13512 13674 13688 15372 15686 16393 16426 16543 16853 16930 16993 17124 17155 17274 17288 17394 17502 17552 17606-17607 18743 18745 18797 19163 19409 19777 19931 19948 20071 20125 20327 20381 20491-20492 20505 20508 20510 20528 20564 20602 20609-20610 20618 20636-20637 20639 20644-20645 20650 20657-20658 20706 21023 21050 21070 21080 21082-21083 21094 21118 21135 21139 21145 21180 21202 21217 21289 21296 21365 21386 21418 21420 21424 21436 21763 22067 22146 22245 22349 22535 22581 22619 22647 22683 22773 22823 22908 22942 22964 23028 23068 23094 23136 23140 23155 23176 23272 23321 23388 23395 23895 24608 24629 24633 24740 24763 25113 26133 26223 27201 27392 28746 28784 29187 29378 29569 29657 29999 30477 30826 31104 32836 32844 32891 32912 32917 32930 32937 32952 32970 33006 33050 33065 33095 33100 33116 33129 33170 33186 33193 33268 33312 33342 33349 33355 33361 33367 33370 33382 33422 33449 33456 33461 33464 33468 33482 33500-33501 33513 33517 33520 33523 33529 33537 33545 33548 33551 33565 33583 33593-33594 33643 33666 33670 33677 33689 33694 33697 33704 33706-33707 33716 33718 33737 33756 33791 33850 33919 33937 33956 33965 33993 33996 34008 34012 34043 34047 34050 34054 34058 34073-34074 34099 34102 34126-34127 34138 34140 34146 34163-34165 34203 34206 34244-34245 34269 34290 34312 34338 34378 34380 34384-34385 34406 34415 34423 34436 34450 34464 34486 34501 34509 34530 34538 34577 34586 34611 34680 34683 34699 34733 34757 34790 34819 34823 34825 34829-34830 34834 34840 34843 34857 34886 34896 34909 34920 34930 34959 34963 35002 35027 35037 35042 35075 35077 35123 35131 35147 35174 35268 35415 35497 35531 35845 35847 35859 35861 35885 35887 35945 36036 36045 36130 36158 36308 36346 36487 36578 36686 36713 36884 36899 36907 36928 36948 36961 36963 36967 36969 37006 37010 37012-37013 37032 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 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 39091 39122-39123 39208 39279 39310 39336 39450 39464 39489 39523-39524 39544 39579 39584 39616 39625 39627 39634 39735 39829 39851 40251 40596 40977 41128 41130-41131 41139 41158 41295 41472 41481 41484 41505 41526 41528 41530 41553 41600 41798 41854 42096 42242 42272 43571 43670 43677 43683 43704 44439 45072-45073 45101 45108 45120 45168 45208 45324 45336 45345 45351 45378 45382 45389 45394 45416 45471-45472 45475 45503 45510 45538 45544 45607 45678 45746 45852 45876 45894 45927 45964 45967 45977 45983 45987 46082 46087 46115 46207 46339 46383 46456 46601 46615 46692 46739 46754 46758 46922 47120-47121 47125 47205 47249 47287 47345 47366 47626 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/645/A30?format=asciidefaultJ/A+A/645/A30/sacysbpresented in this work (table G4)SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSimbad identifiermeta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainRV-med-ccf? Median RV from our CCFkm/sphys.veloc;pos.heliocentricfloatnullables_RV-med-ccf? Standard deviation in RV from our CCFkm/sstat.stdevfloatnullablevsini-med-ccf? Median vsini from our CCFkm/sphys.veloc.rotatfloatnullables_vsini-med-ccf? Standard deviation in vsini from our CCFkm/sstat.stdev;phys.veloc.rotatfloatnullableo_RV-med-ccf? Number of observation (CCF)meta.numberintnullableRV-med-lit? Median RV from literaturekm/sphys.veloc;pos.heliocentricfloatnullables_RV-med-lit? Standard deviation in RV from literaturekm/sstat.stdevfloatnullableo_RV-med-lit? Number of observation (RV literature)meta.numberintnullablevsini-med-lit? Median vsini from literaturekm/sphys.veloc.rotatfloatnullables_vsini-med-lit? Standard deviation in vsini from literaturekm/sstat.stdev;phys.veloc.rotatfloatnullableo_vsini-med-lit? Number of observation (vsini literature)meta.numberintnullablePer? Period from light curvedtime.periodfloatnullablee_Per? Period uncertaintydstat.errorfloatnullableFAP? False alarm probabilitystat.fit.goodnessdoublenullableP-MAD? Mean average deviation (phased LC)stat.stdevdoublenullableR-MAD? MAD (residuals of phased LC)stat.fit.residualdoublenullableP-MAD/R-MAD? Ratio phased-MAD and residual-MADstat.fit.omcdoublenullableInstLC measurement instrument (TESS or K2)instrcharTESSsector? TESS sectormeta.idintnullableTESS/K2? TESS or K2 identifiermeta.idlongnullableNTESSNumber of sources in TESS aperturemeta.numbercharMindGmag? Minimun delta Mag in TESS aperturemagphys.angSize;instr.fovfloatnullableLCnotes[N/ NG TG] Light curves notesmeta.notecharLCqflagLight curves quality flagmeta.code.qual;phys.composition.massLightRatiocharGaiaDR2? Gaia DR2 source_idmeta.idnullableMass? MasssolMassphys.massfloatnullableSpType? Spectral typesrc.spTypecharSACYMGBest moving group match from SACY methodmeta.id.parentcharSACYprob? Membership probability from SACY methodstat.probabilityfloatnullableBANMGBest moving group match from BANYANmeta.id.parentcharBANprob? Membership probability from BANYANstat.probabilitydoublenullableNotesNotes on SB candidatesmeta.notecharJ/A+A/645/A30/rvindiIndividual radial velocities values calculated in this work and compiled from the literature/Gaia DR2 for 590 stars (table G1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSimbad identifiermeta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVRadial velocity uncertaintykm/sstat.errordoubleMJD? Observation datedtime.epochfloatnullableBIS? Bisector inverse slopephys.velocfloatnullablebb? Bisector slopespect.indexdoublenullablecb? Curvaturestat.fit.paramfloatnullableInstObservation instrumentinstr;obscharr_RVReference code (1)meta.ref;pos.framecharJ/A+A/645/A30/rotvelIndividual rotational velocity values calculated in this work and compiled from literature for 483 stars (table G2)NameSimbad identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainvsiniRotational velocitykm/sphys.veloc.rotatfloate_vsiniRotational velocity uncertaintykm/sstat.error;phys.veloc.rotatfloatr_vsiniReference code (1)meta.refchar