The discovery of the T8.5 dwarf UGPS J0521+3640
Identifieur interne : 006307 ( Main/Curation ); précédent : 006306; suivant : 006308The discovery of the T8.5 dwarf UGPS J0521+3640
Auteurs : Ben Burningham [Royaume-Uni] ; P. W. Lucas ; S. K. Leggett [États-Unis] ; R. Smart [Italie] ; D. Baker ; D. J. Pinfield ; C. G. Tinney [Australie] ; D. Homeier [Allemagne] ; F. Allard [France] ; Z. H. Zhang ; J. Gomes ; A. C. Day-Jones [Chili] ; H. R. A. Jones ; G. Kovács ; N. Lodieu [Espagne] ; F. Marocco ; D. N. Murray ; B. Sip CzSource :
- Monthly Notices of the Royal Astronomical Society: Letters [ 1745-3925 ] ; 2011-06-11.
English descriptors
- KwdEn :
- Burningham, Cool companions, Data release, Dwarf ugps, Galactic plane, Gemini observatory, Ideal candidate, Istituto nazionale, Lucas, Mnras, Model grid, Monthly notices, Photometry, Project number, Proper motion, Proper motions, Settl model grid, Solar metallicity, Spectral type, Spectral type plots, Spectral typing index ratios, Spie conf, Total integration time, Ugps, Ugps ugps, Ukidss, Visual inspection.
- Teeft :
- Burningham, Cool companions, Data release, Dwarf ugps, Galactic plane, Gemini observatory, Ideal candidate, Istituto nazionale, Lucas, Mnras, Model grid, Monthly notices, Photometry, Project number, Proper motion, Proper motions, Settl model grid, Solar metallicity, Spectral type, Spectral type plots, Spectral typing index ratios, Spie conf, Total integration time, Ugps, Ugps ugps, Ukidss, Visual inspection.
Abstract
We have carried out a search for late‐type T dwarfs in the UKIRT Infrared Deep Sky Survey Galactic Plane Survey 6th Data Release. The search yielded two persuasive candidates, both of which have been confirmed as T dwarfs. The brightest, UGPS J0521+3640, has been assigned the spectral type T8.5 and appears to lie at a distance of 7–9 pc. The fainter of the two, UGPS J0652+0324, is classified as a T5.5 dwarf and lies at an estimated distance of 28–37 pc. Warm‐Spitzer observations in IRAC channels 1 and 2, taken as part of the GLIMPSE360 Legacy Survey, are available for UGPS J0521+3640 and we used these data with the near‐infrared spectroscopy to estimate its properties. We find best‐fitting solar metallicity BT‐Settl models for Teff= 600 and 650 K and log g= 4.5 and 5.0. These parameters suggest a mass between 14 and 32MJ for an age between 1 and 5 Gyr. The proximity of this very cool T dwarf, and its location in the Galactic plane, makes it an ideal candidate for high‐resolution adaptive optics imaging to search for cool companions.
Url:
DOI: 10.1111/j.1745-3933.2011.01062.x
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<front><div type="abstract" xml:lang="en">We have carried out a search for late‐type T dwarfs in the UKIRT Infrared Deep Sky Survey Galactic Plane Survey 6th Data Release. The search yielded two persuasive candidates, both of which have been confirmed as T dwarfs. The brightest, UGPS J0521+3640, has been assigned the spectral type T8.5 and appears to lie at a distance of 7–9 pc. The fainter of the two, UGPS J0652+0324, is classified as a T5.5 dwarf and lies at an estimated distance of 28–37 pc. Warm‐Spitzer observations in IRAC channels 1 and 2, taken as part of the GLIMPSE360 Legacy Survey, are available for UGPS J0521+3640 and we used these data with the near‐infrared spectroscopy to estimate its properties. We find best‐fitting solar metallicity BT‐Settl models for Teff= 600 and 650 K and log g= 4.5 and 5.0. These parameters suggest a mass between 14 and 32MJ for an age between 1 and 5 Gyr. The proximity of this very cool T dwarf, and its location in the Galactic plane, makes it an ideal candidate for high‐resolution adaptive optics imaging to search for cool companions.</div>
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