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Article: Properties and formation of the multiple protostellar system L1551 1RS 5

TitleProperties and formation of the multiple protostellar system L1551 1RS 5
Authors
KeywordsBinaries: Close
Circumstellar Matter
Stars: Formation Stars: Individual (L1551 Irs 5)
Stars: Low-Mass, Brown Dwarfs
Issue Date2006
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2006, v. 653 n. 1 I, p. 425-436 How to Cite?
AbstractWe present an observation of L1551 IRS 5 at 7 mm with an angular resolution as high as ∼0″.04 (5 AU). Apart from the two main components oriented north-south with a projected separation of 47 AU, we discover a third component lying 13 AU to the southeast of the northern component, thereby making L1551 IRS 5 a triple protostellar system. The two main components comprise circumstellar dust disks with dimensions of ∼17 AU, together with bipolar ionized jets collimated within a radial distance of ≲3 AU from their central protostars. The third component likely has an even smaller circumstellar dust disk with a dimension of ∼9 AU. The relative proper motion of the two main components is consistent with a circular coplanar orbit with an orbital separation of ∼50 AU, orbital period of ∼380 yr, and total mass of ∼0.9 M⊙. Their measured disk sizes are smaller than the predicted gravitationally truncated sizes of ∼26 AU. Together with the predicted minimum size for a circumbinary gap, noncircular coplanar orbits are constrained to an eccentricity ≲0.3. The disks of the two main components are accurately aligned with each other, as well as with a surrounding molecular pseudodisk. Furthermore, the clockwise orbital motion of these components coincides with the clockwise rotational motion of the pseudodisk. These attributes constitute a smoking gun for the formation of the two main components as a result of fragmentation within the inner regions of their parent pseudodisk. By contrast, the disk of the third component is significantly misaligned; measurements of its relative proper motion are required in order to help deduce its origin. © 2006. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/175047
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLim, Jen_US
dc.contributor.authorTakakuwa, Sen_US
dc.date.accessioned2012-11-26T08:48:56Z-
dc.date.available2012-11-26T08:48:56Z-
dc.date.issued2006en_US
dc.identifier.citationAstrophysical Journal Letters, 2006, v. 653 n. 1 I, p. 425-436en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/175047-
dc.description.abstractWe present an observation of L1551 IRS 5 at 7 mm with an angular resolution as high as ∼0″.04 (5 AU). Apart from the two main components oriented north-south with a projected separation of 47 AU, we discover a third component lying 13 AU to the southeast of the northern component, thereby making L1551 IRS 5 a triple protostellar system. The two main components comprise circumstellar dust disks with dimensions of ∼17 AU, together with bipolar ionized jets collimated within a radial distance of ≲3 AU from their central protostars. The third component likely has an even smaller circumstellar dust disk with a dimension of ∼9 AU. The relative proper motion of the two main components is consistent with a circular coplanar orbit with an orbital separation of ∼50 AU, orbital period of ∼380 yr, and total mass of ∼0.9 M⊙. Their measured disk sizes are smaller than the predicted gravitationally truncated sizes of ∼26 AU. Together with the predicted minimum size for a circumbinary gap, noncircular coplanar orbits are constrained to an eccentricity ≲0.3. The disks of the two main components are accurately aligned with each other, as well as with a surrounding molecular pseudodisk. Furthermore, the clockwise orbital motion of these components coincides with the clockwise rotational motion of the pseudodisk. These attributes constitute a smoking gun for the formation of the two main components as a result of fragmentation within the inner regions of their parent pseudodisk. By contrast, the disk of the third component is significantly misaligned; measurements of its relative proper motion are required in order to help deduce its origin. © 2006. The American Astronomical Society. All rights reserved.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectBinaries: Closeen_US
dc.subjectCircumstellar Matteren_US
dc.subjectStars: Formation Stars: Individual (L1551 Irs 5)en_US
dc.subjectStars: Low-Mass, Brown Dwarfsen_US
dc.titleProperties and formation of the multiple protostellar system L1551 1RS 5en_US
dc.typeArticleen_US
dc.identifier.emailLim, J: jjlim@hku.hken_US
dc.identifier.authorityLim, J=rp00745en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1086/508510en_US
dc.identifier.scopuseid_2-s2.0-33846029856en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33846029856&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume653en_US
dc.identifier.issue1 Ien_US
dc.identifier.spage425en_US
dc.identifier.epage436en_US
dc.identifier.isiWOS:000242913800032-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLim, J=7403453870en_US
dc.identifier.scopusauthoridTakakuwa, S=7003425073en_US

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