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Article: A Keplerian circumbinary disk around the protostellar system L1551 NE

TitleA Keplerian circumbinary disk around the protostellar system L1551 NE
Authors
KeywordsIsm: individual objects (l1551 ne)
Ism: molecules
Stars: formation
Issue Date2012
PublisherInstitute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
The Astrophysical Journal, 2012, v. 754 n. 1, article no. 52 How to Cite?
AbstractWe present Submillimeter Array observations of a Keplerian disk around the Class I protobinary system L1551 NE in 335GHz continuum emission and submillimeter line emission in 13CO (J = 3-2) and C 18O (J = 3-2) at a resolution of 120 × 80AU. The 335GHz dust-continuum image shows a strong central peak closely coincident with the binary protostars and likely corresponding to circumstellar disks, surrounded by a 600 × 300AU feature elongated approximately perpendicular to the [Fe II] jet from the southern protostellar component suggestive of a circumbinary disk. The 13CO and C 18O images confirm that the circumbinary continuum feature is indeed a rotating disk; furthermore, the C 18O channel maps can be well modeled by a geometrically thin disk exhibiting Keplerian rotation. We estimate a mass for the circumbinary disk of 0.03-0.12 M, compared with an enclosed mass of 0.8 M that is dominated by the protobinary system. Compared with several other Class I protostars known to exhibit Keplerian disks, L1551 NE has the lowest bolometric temperature (91K), highest envelope mass (0.39 M), and the lowest ratio in stellar mass to envelope + disk + stellar mass (0.65). L1551 NE may therefore be the youngest protostellar object so far found to exhibit a Keplerian disk. Our observations present firm evidence that Keplerian disks around binary protostellar systems, 'Keplerian circumbinary disks,' can exist. We speculate that tidal effects from binary companions could transport angular momenta toward the inner edge of the circumbinary disk and create the Keplerian circumbinary disk. © 2012. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/159790
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTakakuwa, Sen_HK
dc.contributor.authorSaito, Men_HK
dc.contributor.authorLim, Jen_HK
dc.contributor.authorSaigo, Ken_HK
dc.contributor.authorSridharan, TKen_HK
dc.contributor.authorPatel, NAen_HK
dc.date.accessioned2012-08-16T05:56:38Z-
dc.date.available2012-08-16T05:56:38Z-
dc.date.issued2012en_HK
dc.identifier.citationThe Astrophysical Journal, 2012, v. 754 n. 1, article no. 52en_HK
dc.identifier.issn0004-637Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/159790-
dc.description.abstractWe present Submillimeter Array observations of a Keplerian disk around the Class I protobinary system L1551 NE in 335GHz continuum emission and submillimeter line emission in 13CO (J = 3-2) and C 18O (J = 3-2) at a resolution of 120 × 80AU. The 335GHz dust-continuum image shows a strong central peak closely coincident with the binary protostars and likely corresponding to circumstellar disks, surrounded by a 600 × 300AU feature elongated approximately perpendicular to the [Fe II] jet from the southern protostellar component suggestive of a circumbinary disk. The 13CO and C 18O images confirm that the circumbinary continuum feature is indeed a rotating disk; furthermore, the C 18O channel maps can be well modeled by a geometrically thin disk exhibiting Keplerian rotation. We estimate a mass for the circumbinary disk of 0.03-0.12 M, compared with an enclosed mass of 0.8 M that is dominated by the protobinary system. Compared with several other Class I protostars known to exhibit Keplerian disks, L1551 NE has the lowest bolometric temperature (91K), highest envelope mass (0.39 M), and the lowest ratio in stellar mass to envelope + disk + stellar mass (0.65). L1551 NE may therefore be the youngest protostellar object so far found to exhibit a Keplerian disk. Our observations present firm evidence that Keplerian disks around binary protostellar systems, 'Keplerian circumbinary disks,' can exist. We speculate that tidal effects from binary companions could transport angular momenta toward the inner edge of the circumbinary disk and create the Keplerian circumbinary disk. © 2012. The American Astronomical Society. All rights reserved.en_HK
dc.languageengen_US
dc.publisherInstitute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/en_HK
dc.relation.ispartofThe Astrophysical Journalen_HK
dc.rightsThe Astrophysical Journal. Copyright © Institute of Physics Publishing, Inc.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectIsm: individual objects (l1551 ne)en_HK
dc.subjectIsm: moleculesen_HK
dc.subjectStars: formationen_HK
dc.titleA Keplerian circumbinary disk around the protostellar system L1551 NEen_HK
dc.typeArticleen_HK
dc.identifier.emailTakakuwa, S: takakuwa@asiaa.sinica.edu.twen_HK
dc.identifier.emailLim, J: jjlim@hku.hk-
dc.identifier.authorityLim, J=rp00745en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1088/0004-637X/754/1/52en_HK
dc.identifier.scopuseid_2-s2.0-84863702588en_HK
dc.identifier.hkuros203734en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84863702588&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume754en_HK
dc.identifier.issue1, article no. 52en_HK
dc.identifier.isiWOS:000306111800052-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridPatel, NA=35479191600en_HK
dc.identifier.scopusauthoridSridharan, TK=6701592129en_HK
dc.identifier.scopusauthoridSaigo, K=7101766676en_HK
dc.identifier.scopusauthoridLim, J=7403453870en_HK
dc.identifier.scopusauthoridSaito, M=55308020400en_HK
dc.identifier.scopusauthoridTakakuwa, S=7003425073en_HK

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