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dc.contributor.authorBurningham, B.
dc.contributor.authorLeggett, S.K.
dc.contributor.authorLucas, P.W.
dc.contributor.authorPinfield, D.J.
dc.contributor.authorSmart, R.L.
dc.contributor.authorDay-Jones, A.C.
dc.contributor.authorJones, H.R.A.
dc.contributor.authorMurray, D.N.
dc.contributor.authorNickson, E.
dc.contributor.authorTamura, M.
dc.contributor.authorZhang, Z.
dc.contributor.authorLodieu, N.
dc.contributor.authorTinney, C.G.
dc.contributor.authorZapatero Osorio, M.R.
dc.date.accessioned2010-11-30T12:02:55Z
dc.date.available2010-11-30T12:02:55Z
dc.date.issued2010
dc.identifier.citationBurningham , B , Leggett , S K , Lucas , P W , Pinfield , D J , Smart , R L , Day-Jones , A C , Jones , H R A , Murray , D N , Nickson , E , Tamura , M , Zhang , Z , Lodieu , N , Tinney , C G & Zapatero Osorio , M R 2010 , ' The discovery of a very cool binary system ' , Monthly Notices of the Royal Astronomical Society , vol. 404 , no. 4 , pp. 1952-1961 . https://doi.org/10.1111/j.1365-2966.2010.16411.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 138079
dc.identifier.otherPURE UUID: 5a36e139-3867-4627-87ab-12d121805137
dc.identifier.otherdspace: 2299/5038
dc.identifier.otherScopus: 77953570025
dc.identifier.urihttp://hdl.handle.net/2299/5038
dc.descriptionThe definitive version can be found at: http://www3.interscience.wiley.com/ Copyright Royal Astronomical Society
dc.description.abstractWe report the discovery of a very cool d/sdL7+T7.5p common proper motion binary system, SDSS J1416+13AB, found by cross-matching the United Kingdom Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) Large Area Survey Data Release 5 (UKIDSS LAS DR4) against the Sloan Digital Sky Survey Data Release 7. The d/sdL7 is blue in J−H and H−K and has other features suggestive of low metallicity and/or high gravity. The T7.5p displays spectral peculiarity seen before in earlier type dwarfs discovered in UKIDSS LAS DR4, and referred to as CH4-J-early peculiarity, where the CH4-J index, based on the absorption to the red side of the J-band peak, suggests an earlier spectral type than the H2O-J index, based on the blue side of the J-band peak, by ∼2 subtypes. We suggest that CH4-J-early peculiarity arises from low metallicity and/or high gravity, and speculate as to its use for classifying T dwarfs. UKIDSS and follow-up United Kingdom Infrared Telescope/Wide Field CAMera (UKIRT/WFCAM) photometry shows the T dwarf to have the bluest near-infrared colours yet seen for such an object with H−K=−1.31 ± 0.17 . Warm Spitzer IRAC photometry shows the T dwarf to have extremely red H−[4.5]= 4.86 ± 0.04 , which is the reddest yet seen for a substellar object. The lack of parallax measurement for the pair limits our ability to estimate parameters for the system. However, applying a conservative distance estimate of 5–15 pc suggests a projected separation in range 45–135 au. By comparing H−K:H−[4.5] colours of the T dwarf to spectral models, we estimate that Teff= 500 K and [M/H]∼− 0.30 , with log g∼ 5.0 . This suggests a mass of ∼30 MJupiter for the T dwarf and an age of ∼10 Gyr for the system. The primary would then be a 75 MJupiter object with log g∼ 5.5 and a relatively dust-free Teff∼ 1500 K atmosphere. Given the unusual properties of the system we caution that these estimates are uncertain. We eagerly await parallax measurements and high-resolution imaging which will constrain the parameters further. [Please see original online version for correct notation]en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rights/dk/atira/pure/core/openaccesspermission/open
dc.titleThe discovery of a very cool binary systemen
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=77953570025&partnerID=8YFLogxK
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2010.16411.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeclosedAccess


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