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Article: Properties and formation of the multiple protostellar system L1551 1RS 5
Title | Properties and formation of the multiple protostellar system L1551 1RS 5 |
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Authors | |
Keywords | Binaries: Close Circumstellar Matter Stars: Formation Stars: Individual (L1551 Irs 5) Stars: Low-Mass, Brown Dwarfs |
Issue Date | 2006 |
Publisher | Institute 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? |
Abstract | We 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 Identifier | http://hdl.handle.net/10722/175047 |
ISSN | 2023 Impact Factor: 8.8 2023 SCImago Journal Rankings: 2.766 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Lim, J | en_US |
dc.contributor.author | Takakuwa, S | en_US |
dc.date.accessioned | 2012-11-26T08:48:56Z | - |
dc.date.available | 2012-11-26T08:48:56Z | - |
dc.date.issued | 2006 | en_US |
dc.identifier.citation | Astrophysical Journal Letters, 2006, v. 653 n. 1 I, p. 425-436 | en_US |
dc.identifier.issn | 2041-8205 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/175047 | - |
dc.description.abstract | We 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.language | eng | en_US |
dc.publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205 | en_US |
dc.relation.ispartof | Astrophysical Journal Letters | en_US |
dc.subject | Binaries: Close | en_US |
dc.subject | Circumstellar Matter | en_US |
dc.subject | Stars: Formation Stars: Individual (L1551 Irs 5) | en_US |
dc.subject | Stars: Low-Mass, Brown Dwarfs | en_US |
dc.title | Properties and formation of the multiple protostellar system L1551 1RS 5 | en_US |
dc.type | Article | en_US |
dc.identifier.email | Lim, J: jjlim@hku.hk | en_US |
dc.identifier.authority | Lim, J=rp00745 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1086/508510 | en_US |
dc.identifier.scopus | eid_2-s2.0-33846029856 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-33846029856&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 653 | en_US |
dc.identifier.issue | 1 I | en_US |
dc.identifier.spage | 425 | en_US |
dc.identifier.epage | 436 | en_US |
dc.identifier.isi | WOS:000242913800032 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | Lim, J=7403453870 | en_US |
dc.identifier.scopusauthorid | Takakuwa, S=7003425073 | en_US |
dc.identifier.issnl | 2041-8205 | - |