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

Bibcode
2010A&A...524A..38M
DOI
10.1051/0004-6361/201015394
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.
Referencia bibliográfica

Astronomy and Astrophysics, Volume 524, id.A38

Fecha de publicación:
12
2010
Revista
Astronomy and Astrophysics
Número de autores
14
Número de autores del IAC
1
Número de citas
68
Número de citas referidas
56
Descripción
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.
Tipo
Con árbitro
Astrometría

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