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dc.contributor.authorZhang, Z.
dc.contributor.authorPinfield, D.J.
dc.contributor.authorDay-Jones, A.C.
dc.contributor.authorBurningham, B.
dc.contributor.authorJones, H.R.A.
dc.contributor.authorYu, S.
dc.contributor.authorJenkins, J.S.
dc.contributor.authorHan, Z.
dc.contributor.authorGalvez-Ortiz, M.C.
dc.contributor.authorGallardo, J.
dc.contributor.authorGarcia Perez, A.E.
dc.contributor.authorWeights, D.
dc.contributor.authorTinney, C.G.
dc.contributor.authorPokorny, R.S.
dc.date.accessioned2010-11-30T14:20:50Z
dc.date.available2010-11-30T14:20:50Z
dc.date.issued2010
dc.identifier.citationZhang , Z , Pinfield , D J , Day-Jones , A C , Burningham , B , Jones , H R A , Yu , S , Jenkins , J S , Han , Z , Galvez-Ortiz , M C , Gallardo , J , Garcia Perez , A E , Weights , D , Tinney , C G & Pokorny , R S 2010 , ' Discovery of the first L dwarf plus giant binary system and eight other ultracool dwarfs in wide binaries ' , Monthly Notices of the Royal Astronomical Society , vol. 404 , no. 4 , pp. 1817-1834 . https://doi.org/10.1111/j.1365-2966.2010.16394.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 138312
dc.identifier.otherPURE UUID: f5fb3cbf-59de-4b3d-a548-b8986b2baf38
dc.identifier.otherdspace: 2299/5040
dc.identifier.otherScopus: 77953564379
dc.identifier.otherORCID: /0000-0003-4600-5627/work/64327369
dc.identifier.urihttp://hdl.handle.net/2299/5040
dc.descriptionThe definitive article can be found at: http://www3.interscience.wiley.com/ Copyright Royal Astronomical Society
dc.description.abstractWe identify 806 ultracool dwarfs (of which 34 are newly discovered L dwarfs) from their Sloan Digital Sky Survey (SDSS) riz photometry and obtain proper motions through cross-matching with the United Kingdom Infrared Telescope Infrared Deep Sky Survey (UKIDSS) and Two-Micron All-Sky Survey (2MASS). Proper-motion and distance constraints show that nine of our ultracool dwarfs are members of widely separated binary systems: SDSS 0101 (K5V+M9.5V), SDSS 0207 (M1.5V+L3V), SDSS 0832 (K3III+L3.5V), SDSS 0858 (M4V+L0V), SDSS 0953 (M4V+M9.5V), SDSS 0956 (M2V+M9V), SDSS 1304 (M4.5V+L0V), SDSS 1631 (M5.5V+M8V) and SDSS 1638 (M4V+L0V). One of these (SDSS 0832) is shown to be a companion to the bright K3 giant η Cancri. Such primaries can provide age and metallicity constraints for any companion objects, yielding excellent benchmark objects. η Cancri AB is the first wide ultracool dwarf + giant binary system identified. We present new observations and analysis that constrain the metallicity of η Cancri A to be near-solar, and use recent evolutionary models to constrain the age of the giant to be 2.2–6.1 Gyr. If η Cancri B is a single object, we estimate its physical attributes to be mass = 63–82 MJup, Teff = 1800 ± 150 K, log g= 5.3–5.5, [M/H]= 0.0 ± 0.1 . Its colours are non-typical when compared with other ultracool dwarfs, and we also assess the possibility that η Cancri B is itself an unresolved binary, showing that the combined light of an L4 + T4 system could provide a reasonable explanation for its colours.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.titleDiscovery of the first L dwarf plus giant binary system and eight other ultracool dwarfs in wide binariesen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionScience & Technology Research Institute
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=77953564379&partnerID=8YFLogxK
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dcterms.dateAccepted2010
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2010.16394.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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