dc.contributor.author | Burningham, B. | |
dc.contributor.author | Leggett, S.K. | |
dc.contributor.author | Lucas, P.W. | |
dc.contributor.author | Pinfield, D.J. | |
dc.contributor.author | Smart, R.L. | |
dc.contributor.author | Day-Jones, A.C. | |
dc.contributor.author | Jones, H.R.A. | |
dc.contributor.author | Murray, D.N. | |
dc.contributor.author | Nickson, E. | |
dc.contributor.author | Tamura, M. | |
dc.contributor.author | Zhang, Z. | |
dc.contributor.author | Lodieu, N. | |
dc.contributor.author | Tinney, C.G. | |
dc.contributor.author | Zapatero Osorio, M.R. | |
dc.date.accessioned | 2010-11-30T12:02:55Z | |
dc.date.available | 2010-11-30T12:02:55Z | |
dc.date.issued | 2010 | |
dc.identifier.citation | Burningham , 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.issn | 0035-8711 | |
dc.identifier.other | PURE: 138079 | |
dc.identifier.other | PURE UUID: 5a36e139-3867-4627-87ab-12d121805137 | |
dc.identifier.other | dspace: 2299/5038 | |
dc.identifier.other | Scopus: 77953570025 | |
dc.identifier.other | ORCID: /0000-0002-8872-4462/work/62748859 | |
dc.identifier.other | ORCID: /0000-0003-4600-5627/work/64327317 | |
dc.identifier.uri | http://hdl.handle.net/2299/5038 | |
dc.description | The definitive version can be found at: http://www3.interscience.wiley.com/ Copyright Royal Astronomical Society | |
dc.description.abstract | We 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.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.title | The discovery of a very cool binary system | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Centre for Astrophysics Research | |
dc.contributor.institution | Science & Technology Research Institute | |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.contributor.institution | School of Engineering and Technology | |
dc.description.status | Peer reviewed | |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=77953570025&partnerID=8YFLogxK | |
rioxxterms.versionofrecord | https://doi.org/10.1111/j.1365-2966.2010.16411.x | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |