SIMBAD references

2013MNRAS.433..457B - Mon. Not. R. Astron. Soc., 433, 457-497 (2013/July-3)

76 T dwarfs from the UKIDSS LAS: benchmarks, kinematics and an updated space density.

BURNINGHAM B., CARDOSO C.V., SMITH L., LEGGETT S.K., SMART R.L., MANN A.W., DHITAL S., LUCAS P.W., TINNEY C.G., PINFIELD D.J., ZHANG Z., MORLEY C., SAUMON D., ALLER K., LITTLEFAIR S.P., HOMEIER D., LODIEU N., DEACON N., MARLEY M.S., VAN SPAANDONK L., BAKER D., ALLARD F., ANDREI A.H., CANTY J., CLARKE J., DAY-JONES A.C., DUPUY T., FORTNEY J.J., GOMES J., ISHII M., JONES H.R.A., LIU M., MAGAZZU A., MAROCCO F., MURRAY D.N., ROJAS-AYALA B. and TAMURA M.

Abstract (from CDS):

We report the discovery of 76 new T dwarfs from the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS). Near-infrared broad- and narrow-band photometry and spectroscopy are presented for the new objects, along with Wide-field Infrared Survey Explorer (WISE) and warm-Spitzer photometry. Proper motions for 128 UKIDSS T dwarfs are presented from a new two epoch LAS proper motion catalogue. We use these motions to identify two new benchmark systems: LHS 6176AB, a T8p+M4 pair and HD 118865AB, a T5.5+F8 pair. Using age constraints from the primaries and evolutionary models to constrain the radii, we have estimated their physical properties from their bolometric luminosity. We compare the colours and properties of known benchmark T dwarfs to the latest model atmospheres and draw two principal conclusions. First, it appears that the H - [4.5] and J - W2 colours are more sensitive to metallicity than has previously been recognized, such that differences in metallicity may dominate over differences in Teff when considering relative properties of cool objects using these colours. Secondly, the previously noted apparent dominance of young objects in the late-T dwarf sample is no longer apparent when using the new model grids and the expanded sample of late-T dwarfs and benchmarks. This is supported by the apparently similar distribution of late-T dwarfs and earlier type T dwarfs on reduced proper motion diagrams that we present. Finally, we present updated space densities for the late-T dwarfs, and compare our values to simulation predictions and those from WISE.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): surveys - brown dwarfs - stars: low-mass

VizieR on-line data: <Available at CDS (J/MNRAS/433/457): table1.dat table2.dat table3.dat table4.dat table5.dat>

CDS comments: p.473: BD+01 2930AB is a misprint for BD+01 2920AB. p.481: SDSS 1416+1338B is a misprint for SDSS 1416+1348B. HIP 73786B is GJ 576B in Simbad. LHS 2803B is WDS J13481-1345B in Simbad.

Simbad objects: 180

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2019.10.21-18:31:04

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