J/ApJ/896/81ivo://CDS.VizieR/J/ApJ/896/81doi:10.26093/cds/vizier.18960081CDSStrampelli G.M.Aguilar J.Pueyo L.Aparicio A.Gennaro M.Ubeda L.,Robberto M.2022-03-10T07:31:30Z2021-11-22T14:50:03ZCDS support team

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

cds-question@unistra.frmultiple-starsinfrared-photometrytwo-color-diagramsstellar-massesWe present new results concerning the substellar binary population in the Orion Nebula Cluster (ONC). Using the Karhunen-Loeve Image Projection algorithm, we have reprocessed images taken with the IR channel of the Wide Field Camera 3 mounted on the Hubble Space Telescope to unveil faint, close companions in the wings of the stellar point-spread functions. Starting with a sample of 1392 bona fide unsaturated cluster members, we detect 39 close-pair cluster candidates with separation 0.16"-0.77". The primary masses span a range Mp~0.015-1.27M_{sun}_, whereas for the companions we derive Mc~0.004-0.54M_{sun}_. Of these 39 binary systems, 18 were already known, while the remaining 21 are new detections. Correcting for completeness and combining our catalog with previously detected ONC binaries, we obtain an overall binary fraction of 11.5%+/-0.9%. Compared to other star-forming regions, our multiplicity function is ~2 times smaller than, for example, Taurus, while compared to the binaries in the field we obtain comparable values. We analyze the mass functions of the binaries, finding differences between the mass distributions of binaries and single stars and between primary and companion mass distributions. The mass ratio shows a bottom-heavy distribution with median value Mc/Mp~0.25. Overall, our results suggest that ONC binaries may represent a template for the typical population of field binaries, supporting the hypothesis that the ONC may be regarded as a most typical star-forming region in the Milky Way.2020ApJ...896...81Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/896/81CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)J/AJ/134/2272 : Visual binaries in the Orion Nebula Cluster (Reipurth+, 2007)J/ApJ/731/8 : Multiple star formation in Taurus-Auriga (Kraus+, 2011)J/ApJ/748/14 : ONC population data from WFI observations (Da Rio+, 2012)J/ApJ/753/156 : T/Y brown dwarfs with WISE photometry (Kirkpatrick+, 2012)J/ApJS/207/10 : HST Treasury Program on the ONC (Robberto+, 2013)J/ApJ/794/159 : Statistical analysis of exoplanet surveys (Brandt+, 2014)J/A+A/627/A57 : ONC binary and triple stars (Jerabkova+, 2019)J/ApJ/870/32 : Kinematics in young star clusters & associations (Kuhn+, 2019)J/AJ/157/216 : Multiplicity rate of M dwarfs within 25 pc (Winters+, 2019)J/ApJ/896/79 : HST survey of ONC in H20 1.4um abs. band. I. (Robberto+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/896/81https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/896/81http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/896/81https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/896/81https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/896/81http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/896/81GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/896/81/bincand (Candidate binaries from KLIP algorithm (Table 1) and Paper I (Robberto+, 2020, J/ApJ/896/79))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/896/81/bincand?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/896/81/bincand?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/896/81/bincand?GETtext/xml+votable180.050000true83.65873105-5.4612564540.0055555555555555566/21438-21439 22805https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/896/81?format=asciiInfrareddefaultJ/ApJ/896/81/bincandCandidate binaries from KLIP algorithm (Table 1) and Paper I (Robberto+, 2020, J/ApJ/896/79)Massc[0.004/1.1] Companion masssolMassphys.massdoublee_Massc[3e-5/0.5] Error in MasscsolMassstat.errordoublePA[6/360] Position angledegpos.posAngfloatSep[0.16/1.8] Separation between primary and companionarcsecpos.angDistancefloatSepOriC[14.6/1065] Distance from teta1 OriCarcsecpos.angDistancedoublee_m130c[0.0007/0.8] Uncertainty in m130cmagstat.errordoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetCandidate from KLIP algorithm or Paper I (Robberto+, 2020, J/ApJ/896/79)meta.idcharSeq[0/96] Catalog entry numbermeta.idintWFC3IDp[56/4307] Primary ID from Catalog I (Robberto+, 2020, J/ApJ/896/79)meta.id;meta.mainintWFC3IDc[-1/4308] Companion ID from Catalog I (1)meta.id.associntNameSimbad name designationmeta.id.crosscharRAJ2000[83.6/84] Primary Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-5.7/-5.2] Primary Declination (J2000)degpos.eq.dec;meta.mainm130p[11/16.81] Primary F130N filter magnitude from Catalog Imagphot.mag;em.IR.Jfloate_m130p[0.0007/0.4] Uncertainty in m130pmagstat.errordoublecolorp[-0.41/0.27] Primary F130N-F139M color from Catalog Imagphot.color;em.IR;em.IRdoublee_colorp[9e-5/0.1] Uncertainty in colorpmagstat.errordoublem130c[11.16/20.1] Companion F130N filter magnitude from aperture photometrymagphot.mag;em.IR.Jdoublecolorc[-0.8/0.35] Companion F130N-F139M color from aperture photometrymagphot.color;em.IR;em.IRdoublee_colorc[0.0003/0.3] Uncertainty in colorcmagstat.errordoubleMassp[0.01/1.3] Primary masssolMassphys.massdoublee_Massp[3.5e-5/0.4] Error in MasspsolMassstat.errordouble