Characterization of the nearby L/T binary brown dwarf wise J104915.57–531906.1 at 2 pc from the sun

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dc.contributor.authorKniazev, A Y
dc.contributor.authorVäisänen, P
dc.contributor.authorMužić, K
dc.contributor.authorMehner, A
dc.contributor.authorBoffin, H M J
dc.contributor.authorKurtev, R
dc.contributor.authorMelo, C
dc.contributor.authorIvanov, V D
dc.contributor.authorGirard, J
dc.contributor.authorMawet, D
dc.contributor.authorSchmidtobreick, L
dc.contributor.authorHuelamo, N
dc.contributor.authorBorissova, J
dc.contributor.authorMinniti, D
dc.contributor.authorIshibashi, K
dc.contributor.authorPotter, S B
dc.contributor.authorBeletsky, Y
dc.contributor.authorBuckley, D A H
dc.contributor.authorCrawford, S
dc.contributor.authorGulbis, A A S
dc.contributor.authorKotze, P
dc.contributor.authorMiszalski, B
dc.contributor.authorPickering, T E
dc.contributor.authorRomero-Colmenero, E
dc.contributor.authorWilliams, T B
dc.date.accessioned2021-10-08T07:20:38Z
dc.date.available2021-10-08T07:20:38Z
dc.date.issued2013
dc.description.abstractWISE J104915.57$-$531906.1 is a L/T brown dwarf binary located 2pc from the Sun. The pair contains the closest known brown dwarfs and is the third closest known system, stellar or sub-stellar. We report comprehensive follow-up observations of this newly uncovered system. We have determined the spectral types of both components (L8+/-1, for the primary, agreeing with the discovery paper; T1.5+/-2 for the secondary, which was lacking spectroscopic type determination in the discovery paper) and, for the first time, their radial velocities (V_rad~23.1, 19.5 km/s) using optical spectra obtained at the Southern African Large Telescope (SALT) and other facilities located at the South African Astronomical Observatory (SAAO). The relative radial velocity of the two components is smaller than the range of orbital velocities for theoretically predicted masses, implying that they form a gravitationally bound system. We report resolved near-infrared JHK_S photometry from the IRSF telescope at the SAAO which yields colors consistent with the spectroscopically derived spectral types. The available kinematic and photometric information excludes the possibility that the object belongs to any of the known nearby young moving groups or associations. Simultaneous optical polarimetry observations taken at the SAAO 1.9-m give a non-detection with an upper limit of 0.07%. For the given spectral types and absolute magnitudes, 1Gyr theoretical models predict masses of 0.04--0.05 M_odot for the primary, and 0.03--0.05 M_odot for the secondary.
dc.identifier.apacitationKniazev, A. Y., Väisänen, P., Mužić, K., Mehner, A., Boffin, H. M. J., Kurtev, R., ... Williams, T. B. (2013). Characterization of the nearby L/T binary brown dwarf wise J104915.57–531906.1 at 2 pc from the sun. <i>The Astrophysical Journal</i>, 770(2), 124 - 177. http://hdl.handle.net/11427/34972en_ZA
dc.identifier.chicagocitationKniazev, A Y, P Väisänen, K Mužić, A Mehner, H M J Boffin, R Kurtev, C Melo, et al "Characterization of the nearby L/T binary brown dwarf wise J104915.57–531906.1 at 2 pc from the sun." <i>The Astrophysical Journal</i> 770, 2. (2013): 124 - 177. http://hdl.handle.net/11427/34972en_ZA
dc.identifier.citationKniazev, A.Y., Väisänen, P., Mužić, K., Mehner, A., Boffin, H.M.J., Kurtev, R., Melo, C. & Ivanov, V.D. et al. 2013. Characterization of the nearby L/T binary brown dwarf wise J104915.57–531906.1 at 2 pc from the sun. <i>The Astrophysical Journal.</i> 770(2):124 - 177. http://hdl.handle.net/11427/34972en_ZA
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.ris TY - Journal Article AU - Kniazev, A Y AU - Väisänen, P AU - Mužić, K AU - Mehner, A AU - Boffin, H M J AU - Kurtev, R AU - Melo, C AU - Ivanov, V D AU - Girard, J AU - Mawet, D AU - Schmidtobreick, L AU - Huelamo, N AU - Borissova, J AU - Minniti, D AU - Ishibashi, K AU - Potter, S B AU - Beletsky, Y AU - Buckley, D A H AU - Crawford, S AU - Gulbis, A A S AU - Kotze, P AU - Miszalski, B AU - Pickering, T E AU - Romero-Colmenero, E AU - Williams, T B AB - WISE J104915.57$-$531906.1 is a L/T brown dwarf binary located 2pc from the Sun. The pair contains the closest known brown dwarfs and is the third closest known system, stellar or sub-stellar. We report comprehensive follow-up observations of this newly uncovered system. We have determined the spectral types of both components (L8+/-1, for the primary, agreeing with the discovery paper; T1.5+/-2 for the secondary, which was lacking spectroscopic type determination in the discovery paper) and, for the first time, their radial velocities (V_rad~23.1, 19.5 km/s) using optical spectra obtained at the Southern African Large Telescope (SALT) and other facilities located at the South African Astronomical Observatory (SAAO). The relative radial velocity of the two components is smaller than the range of orbital velocities for theoretically predicted masses, implying that they form a gravitationally bound system. We report resolved near-infrared JHK_S photometry from the IRSF telescope at the SAAO which yields colors consistent with the spectroscopically derived spectral types. The available kinematic and photometric information excludes the possibility that the object belongs to any of the known nearby young moving groups or associations. Simultaneous optical polarimetry observations taken at the SAAO 1.9-m give a non-detection with an upper limit of 0.07%. For the given spectral types and absolute magnitudes, 1Gyr theoretical models predict masses of 0.04--0.05 M_odot for the primary, and 0.03--0.05 M_odot for the secondary. DA - 2013 DB - OpenUCT DP - University of Cape Town IS - 2 J1 - The Astrophysical Journal LK - https://open.uct.ac.za PY - 2013 SM - 0004-637X SM - 1538-4357 T1 - Characterization of the nearby L/T binary brown dwarf wise J104915.57–531906.1 at 2 pc from the sun TI - Characterization of the nearby L/T binary brown dwarf wise J104915.57–531906.1 at 2 pc from the sun UR - http://hdl.handle.net/11427/34972 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34972
dc.identifier.vancouvercitationKniazev AY, Väisänen P, Mužić K, Mehner A, Boffin HMJ, Kurtev R, et al. Characterization of the nearby L/T binary brown dwarf wise J104915.57–531906.1 at 2 pc from the sun. The Astrophysical Journal. 2013;770(2):124 - 177. http://hdl.handle.net/11427/34972.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Astronomy
dc.publisher.facultyFaculty of Science
dc.sourceThe Astrophysical Journal
dc.source.journalissue2
dc.source.journalvolume770
dc.source.pagination124 - 177
dc.source.urihttps://dx.doi.org/10.1088/0004-637X/770/2/124
dc.subject.otherastrophysics
dc.subject.othercosmology and astronomy
dc.subject.othercolor model
dc.subject.otherinfrared surveys
dc.subject.othermass
dc.subject.otherphotometry
dc.subject.otherpolarimetry
dc.subject.otherradial velocity
dc.subject.otherspectra
dc.subject.othersun
dc.subject.othertelescopes
dc.titleCharacterization of the nearby L/T binary brown dwarf wise J104915.57–531906.1 at 2 pc from the sun
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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