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Multiple protostellar systems. II. A high resolution near-infrared imaging survey in nearby star-forming regions

hal.structure.identifierLaboratoire d'Astrophysique de Grenoble [LAOG]
dc.contributor.authorDUCHÊNE, G.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorBONTEMPS, Sylvain
hal.structure.identifierLaboratoire d'Astrophysique de Grenoble [LAOG]
dc.contributor.authorBOUVIER, J.
hal.structure.identifierDépartement d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée [DAPNIA]
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorANDRÉ, P.
hal.structure.identifierNordic Optical Telescope [NOT]
dc.contributor.authorDJUPVIK, A. A.
hal.structure.identifierDepartment of Physics and Astronomy [UCLA Los Angeles]
dc.contributor.authorGHEZ, A. M.
dc.date.issued2007
dc.identifier.issn0004-6361
dc.description.abstractEnContext: Multiple systems are the product of protostellar core fragmentation. Studying their statistical properties in young stellar populations therefore probes the physical processes at play during star formation. Aims: Our project endeavors to obtain a robust view of multiplicity among embedded Class I and Flat Spectrum protostars in a wide array of nearby molecular clouds to disentangle ?universal? from cloud-dependent processes. Methods: We have used near-infrared adaptive optics observations at the VLT through the H, Ks and L' filters to search for tight companions to 45 Class I and Flat Spectrum protostars located in 4 different molecular clouds (Taurus-Auriga, Ophiuchus, Serpens and L1641 in Orion). We complemented these observations with published high-resolution surveys of 13 additional objects in Taurus and Ophiuchus. Results: We found multiplicity rates of 32 ± 6% and 47 ± 8% over the 45-1400 AU and 14-1400 AU separation ranges, respectively. These rates are in excellent agreement with those previously found among T Tauri stars in Taurus and Ophiuchus, and represent an excess of a factor ~1.7 over the multiplicity rate of solar-type field stars. We found no non-hierarchical triple systems, nor any quadruple or higher-order systems. No significant cloud-to-cloud difference has been found, except for the fact that all companions to low-mass Orion protostars are found within 100 AU of their primaries whereas companions found in other clouds span the whole range probed here. Conclusions: Based on this survey, we conclude that core fragmentation always yields a high initial multiplicity rate, even in giant molecular clouds such as the Orion cloud or in clustered stellar populations as in Serpens, in contrast with predictions of numerical simulations. The lower multiplicity rate observed in clustered Class II and Class III populations can be accounted for by a universal set of properties for young systems and subsequent ejections through close encounters with unrelated cluster members. Based on observations collected at the European Southern Observatory, Chile, under programs 71.C-0716, 072.C-0321, 073.C-0450 and 075.C-0312.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enstars: binaries: close
dc.subject.enstars: formation
dc.subject.enstars: pre-main
dc.subject.ensequence
dc.title.enMultiple protostellar systems. II. A high resolution near-infrared imaging survey in nearby star-forming regions
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361:20077270
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv0710.0827
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page229-242
bordeaux.volume476
bordeaux.peerReviewedoui
hal.identifierhal-00285467
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00285467v1
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