Parallaxes and physical properties of 11 mid-to-late T dwarfs

F. Marocco; R.L. Smart; H.R.A. Jones; B. Burningham; M.G. Lattanzi; S.K. Leggett; P.W. Lucas; C.G. Tinney; A. Adamson; D. W. Evans; N. Lodieu; D.N. Murray; D.J. Pinfield; M. Tamura

doi:10.1051/0004-6361/201015394

Parallaxes and physical properties of 11 mid-to-late T dwarfs

F. Marocco, R.L. Smart, H.R.A. Jones, B. Burningham, M.G. Lattanzi, S.K. Leggett, P.W. Lucas, C.G. Tinney, A. Adamson, D. W. Evans, N. Lodieu, D.N. Murray, D.J. Pinfield, M. Tamura

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Abstract

Aims. We present parallaxes of 11 mid-to-late T dwarfs observed in the UKIRT Infrared Deep Sky Survey. We use these results to test the reliability of model predictions in magnitude–color space, determine a magnitude-spectral type calibration, and, estimate a bolometric luminosity and effective temperature range for the targets. Methods. We used observations from the UKIRT WFCAM instrument pipeline processed at the Cambridge Astronomical Survey Unit. The parallaxes and proper motions of the sample were calculated using standard procedures. The bolometric luminosity was estimated using near- and mid-infrared observations with two different methods. The corresponding effective temperature ranges were found adopting a large age-radius range. Results. We show the models are unable to predict the colors of the latest T dwarfs indicating the incompleteness of model opacities for NH3, CH4 and H2 as the temperature declines. We report the effective temperature ranges obtained.

Original language	English
Article number	A38
Number of pages	11
Journal	Astronomy and Astrophysics
Volume	524
DOIs	https://doi.org/10.1051/0004-6361/201015394
Publication status	Published - 2010

Keywords

stars: low-mass
brown dwarfs
stars: fundamental parameters
stars: distances
astrometry
EXTRASOLAR GIANT PLANETS
LARGE-AREA SURVEY
COOL BROWN DWARF
SPECTRAL CLASSIFICATION
CHEMICAL-EQUILIBRIUM
L/T TRANSITION
DATA RELEASE
UKIDSS
PHOTOMETRY
TEMPERATURE

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@article{e705d2b517374ea1bb7e26ddec35237d,

title = "Parallaxes and physical properties of 11 mid-to-late T dwarfs",

abstract = "Aims. We present parallaxes of 11 mid-to-late T dwarfs observed in the UKIRT Infrared Deep Sky Survey. We use these results to test the reliability of model predictions in magnitude–color space, determine a magnitude-spectral type calibration, and, estimate a bolometric luminosity and effective temperature range for the targets. Methods. We used observations from the UKIRT WFCAM instrument pipeline processed at the Cambridge Astronomical Survey Unit. The parallaxes and proper motions of the sample were calculated using standard procedures. The bolometric luminosity was estimated using near- and mid-infrared observations with two different methods. The corresponding effective temperature ranges were found adopting a large age-radius range. Results. We show the models are unable to predict the colors of the latest T dwarfs indicating the incompleteness of model opacities for NH3, CH4 and H2 as the temperature declines. We report the effective temperature ranges obtained.",

keywords = "stars: low-mass, brown dwarfs, stars: fundamental parameters, stars: distances, astrometry, EXTRASOLAR GIANT PLANETS, LARGE-AREA SURVEY, COOL BROWN DWARF, SPECTRAL CLASSIFICATION, CHEMICAL-EQUILIBRIUM, L/T TRANSITION, DATA RELEASE, UKIDSS, PHOTOMETRY, TEMPERATURE",

author = "F. Marocco and R.L. Smart and H.R.A. Jones and B. Burningham and M.G. Lattanzi and S.K. Leggett and P.W. Lucas and C.G. Tinney and A. Adamson and Evans, {D. W.} and N. Lodieu and D.N. Murray and D.J. Pinfield and M. Tamura",

note = "Original article can be found at: http://www.aanda.org/ Copyright The European Southern Observatory (ESO",

year = "2010",

doi = "10.1051/0004-6361/201015394",

language = "English",

volume = "524",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - Parallaxes and physical properties of 11 mid-to-late T dwarfs

AU - Marocco, F.

AU - Smart, R.L.

AU - Jones, H.R.A.

AU - Burningham, B.

AU - Lattanzi, M.G.

AU - Leggett, S.K.

AU - Lucas, P.W.

AU - Tinney, C.G.

AU - Adamson, A.

AU - Evans, D. W.

AU - Lodieu, N.

AU - Murray, D.N.

AU - Pinfield, D.J.

AU - Tamura, M.

N1 - Original article can be found at: http://www.aanda.org/ Copyright The European Southern Observatory (ESO

PY - 2010

Y1 - 2010

N2 - Aims. We present parallaxes of 11 mid-to-late T dwarfs observed in the UKIRT Infrared Deep Sky Survey. We use these results to test the reliability of model predictions in magnitude–color space, determine a magnitude-spectral type calibration, and, estimate a bolometric luminosity and effective temperature range for the targets. Methods. We used observations from the UKIRT WFCAM instrument pipeline processed at the Cambridge Astronomical Survey Unit. The parallaxes and proper motions of the sample were calculated using standard procedures. The bolometric luminosity was estimated using near- and mid-infrared observations with two different methods. The corresponding effective temperature ranges were found adopting a large age-radius range. Results. We show the models are unable to predict the colors of the latest T dwarfs indicating the incompleteness of model opacities for NH3, CH4 and H2 as the temperature declines. We report the effective temperature ranges obtained.

AB - Aims. We present parallaxes of 11 mid-to-late T dwarfs observed in the UKIRT Infrared Deep Sky Survey. We use these results to test the reliability of model predictions in magnitude–color space, determine a magnitude-spectral type calibration, and, estimate a bolometric luminosity and effective temperature range for the targets. Methods. We used observations from the UKIRT WFCAM instrument pipeline processed at the Cambridge Astronomical Survey Unit. The parallaxes and proper motions of the sample were calculated using standard procedures. The bolometric luminosity was estimated using near- and mid-infrared observations with two different methods. The corresponding effective temperature ranges were found adopting a large age-radius range. Results. We show the models are unable to predict the colors of the latest T dwarfs indicating the incompleteness of model opacities for NH3, CH4 and H2 as the temperature declines. We report the effective temperature ranges obtained.

KW - stars: low-mass

KW - brown dwarfs

KW - stars: fundamental parameters

KW - stars: distances

KW - astrometry

KW - EXTRASOLAR GIANT PLANETS

KW - LARGE-AREA SURVEY

KW - COOL BROWN DWARF

KW - SPECTRAL CLASSIFICATION

KW - CHEMICAL-EQUILIBRIUM

KW - L/T TRANSITION

KW - DATA RELEASE

KW - UKIDSS

KW - PHOTOMETRY

KW - TEMPERATURE

U2 - 10.1051/0004-6361/201015394

DO - 10.1051/0004-6361/201015394

M3 - Article

SN - 0004-6361

VL - 524

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A38

ER -

Parallaxes and physical properties of 11 mid-to-late T dwarfs

Abstract

Keywords

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