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The young, tight and low mass binary TWA22AB: a new calibrator for evolutionary models ? Orbit, spectral types and temperatures

hal.structure.identifierLaboratoire d'Astrophysique de Grenoble [LAOG]
dc.contributor.authorBONNEFOY, M.
hal.structure.identifierLaboratoire d'Astrophysique de Grenoble [LAOG]
dc.contributor.authorCHAUVIN, G.
hal.structure.identifierLaboratoire de Génie Chimique [LGC]
dc.contributor.authorDUMAS, C.
hal.structure.identifierLaboratoire d'Astrophysique de Grenoble [LAOG]
dc.contributor.authorLAGRANGE, A-M.
hal.structure.identifierLaboratoire d'Astrophysique de Grenoble [LAOG]
dc.contributor.authorBEUST, H.
hal.structure.identifierLaboratoire d'Astrophysique de Grenoble [LAOG]
dc.contributor.authorDESORT, M.
dc.contributor.authorTEXEIRA, R.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
dc.contributor.authorDUCOURANT, C.
hal.structure.identifierLaboratoire d'Astrophysique de Grenoble [LAOG]
dc.contributor.authorBEUZIT, J-L.
dc.contributor.authorSONG, I.
dc.date.created2009
dc.date.issued2009
dc.identifier.issn0004-6361
dc.description.abstractEnTight binaries discovered in young, nearby associations, with known distances, are ideal targets to provide dynamical mass measurements to test the physics of evolutionary models at young ages and very low masses. We report for the first time the binarity of TWA22, possible new dynamical calibrator for evolutionary models at young ages. Based on an accurate trigonometric distance (17.53 +- 0.21 pc) determination, we infer a total dynamical mass of 220 +- 21 MJup for the system. From the resolved near-infrared integral-field spectroscopy, we find an effective temperature Teff=2900+200-200 K for TWA22 A and Teff=2900+200-100 K for TWA22 B and surface gravities between 4.0 and 5.5 dex. From our photometry and a M6 +- 1 spectral type for both components, we find luminosities of log(L/Lsun)=-2.11 +- 0.13 dex and log(L/Lsun)=-2.30 +- 0.16 dex for TWA22 A and B respectively. By comparing these parameters with evolutionary models, we question the age and the multiplicity of this system. We also discuss a possible underestimation of the mass predicted by evolutionary models for young stars close to the substellar boundary.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enformation
dc.subject.enInstrumentation: adaptive optics
dc.subject.enStars: fundamental parameters
dc.subject.enlow-mass
dc.subject.enbrown dwarfs
dc.subject.enbinary (TWA22 AB): close
dc.subject.enspectrographs
dc.subject.enstars
dc.title.enThe young, tight and low mass binary TWA22AB: a new calibrator for evolutionary models ? Orbit, spectral types and temperatures
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/200810921
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.identifier.arxiv0906.1799
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page799-810
bordeaux.volume506
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-00398406
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00398406v1
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