SIMBAD references

1999ApJ...522L..65B - Astrophys. J., 522, L65-L68 (1999/September-1)

Discovery of four field methane (T-type) dwarfs with the Two Micron All-Sky Survey.

BURGASSER A.J., KIRKPATRICK J.D., BROWN M.E., REID I.N., GIZIS J.E., DAHN C.C., MONET D.G., BEICHMAN C.A., LIEBERT J., CUTRI R.M. and SKRUTSKIE M.F.

Abstract (from CDS):

We report the discovery of four field methane (``T''-type) brown dwarfs using Two Micron All-Sky Survey (2MASS) data. One additional methane dwarf, previously discovered by the Sloan Digital Sky Survey, was also identified. Near-infrared spectra clearly show the 1.6 and 2.2 µm CH4 absorption bands characteristic of objects with Teff≲1300 K as well as broadened H2O bands at 1.4 and 1.9 µm. Comparing the spectra of these objects with that of Gl 229B, we propose that all new 2MASS T dwarfs are warmer than 950 K, in order from warmest to coolest: 2MASS J1217-03, 2MASS J1225-27, 2MASS J1047+21, and 2MASS J1237+65. Based on this preliminary sample, we find a warm T dwarf surface density of 0.0022 T dwarfs deg–2, or ∼90 warm T dwarfs over the whole sky detectable to J<16. The resulting space density upper limit, 0.01 T dwarfs.pc–3, is comparable to that of the first L dwarf sample from Kirkpatrick et al.

Abstract Copyright:

Journal keyword(s): Infrared: Stars - Stars: Fundamental Parameters - Stars: Individual: Alphanumeric: 2MASSI J1047539+212423 - Stars: Individual: Alphanumeric: 2MASSW J1217111-031113 - Stars: Individual: Alphanumeric: 2MASSW J1225543-273947 - Stars: Individual: Alphanumeric: 2MASSW J1237392+652615 - Stars: Individual: Alphanumeric: 2MASSW J1346464-003150 - Stars: Low-Mass, Brown Dwarfs

Nomenclature: Table 1: 2MASSI JHHMMSSs+DDMMSS N=3.

Simbad objects: 10

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