Bibcode
Marocco, F.; Smart, R. L.; Jones, H. R. A.; Burningham, B.; Lattanzi, M. G.; Leggett, S. K.; Lucas, P. W.; Tinney, C. G.; Adamson, A.; Evans, D. W.; Lodieu, N.; Murray, D. N.; Pinfield, D. J.; Tamura, M.
Bibliographical reference
Astronomy and Astrophysics, Volume 524, id.A38
Advertised on:
12
2010
Journal
Citations
67
Refereed citations
57
Description
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.