2007A&A...466.1059K


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.08CEST20:27:34

2007A&A...466.1059K - Astronomy and Astrophysics, volume 466, 1059-1064 (2007/5-2)

Two T dwarfs from the UKIDSS early data release.

KENDALL T.R., TAMURA M., TINNEY C.G., MARTIN E.L., ISHII M., PINFIELD D.J., LUCAS P.W., JONES H.R.A., LEGGETT S.K., DYE S., HEWETT P.C., ALLARD F., BARAFFE I., BARRADO Y NAVASCUES D., CARRARO G., CASEWELL S.L., CHABRIER G., CHAPPELLE R.J., CLARKE F., DAY-JONES A., DEACON N., DOBBIE P.D., FOLKES S., HAMBLY N.C., HODGKIN S.T., NAKAJIMA T., JAMESON R.F., LODIEU N., MAGAZZU A., McCAUGHREAN M.J., PAVLENKO Y.V., TADASHI N. and ZAPATERO OSORIO M.R.

Abstract (from CDS):

We report on the first ultracool dwarf discoveries from the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey Early Data Release (LAS EDR), in particular the discovery of T dwarfs which are fainter and more distant than those found using the 2MASS and SDSS surveys. We aim to show that our methodologies for searching the ∼27deg2 of the LAS EDR are successful for finding both L and T dwarfs via cross-correlation with the Sloan Digital Sky Survey (SDSS) DR4 release. While the area searched so far is small, the numbers of objects found shows great promise for near-future releases of the LAS and great potential for finding large numbers of such dwarfs. Ultracool dwarfs are selected by combinations of their YJH(K) UKIDSS colours and SDSS DR4 z-J and i-z colours, or, lower limits on these red optical/infrared colours in the case of DR4 dropouts. After passing visual inspection tests, candidates have been followed up by methane imaging and spectroscopy at 4m and 8m-class facilities. Our main result is the discovery following CH4 imaging and spectroscopy of a T4.5 dwarf, ULASJ1452+0655, lying ∼80pc distant. A further T dwarf candidate, ULASJ1301+0023, has very similar CH4 colours but has not yet been confirmed spectroscopically. We also report on the identification of a brighter L0 dwarf, and on the selection of a list of LAS objects designed to probe for T-like dwarfs to the survey J-band limit. Our findings indicate that the combination of the UKIDSS LAS and SDSS surveys provide an excellent tool for identifying L and T dwarfs down to much fainter limits than previously possible. Our discovery of one confirmed and one probable T dwarf in the EDR is consistent with expectations from the previously measured T dwarf density on the sky.

Abstract Copyright:

Journal keyword(s): infrared: stars - stars: low-mass, brown dwarfs - stars: fundamental parameters

Nomenclature: Table 1: ULAS JHHMMSS.ss+DDMMSS.s N=6.

Simbad objects: 14

goto Full paper

goto View the reference in ADS

Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ULAS J022637.55+005154.3 BD* 02 26 37.55520 +00 51 54.3816           T3 8 0
2 2MASS J03480772-6022270 BD* 03 48 07.72104 -60 22 27.0624           T7 23 0
3 2MASS J05591914-1404488 BD* 05 59 19.1884616785 -14 04 49.215388622           T4.5 134 0
4 DENIS J090957.1-065806 BD* 09 09 57.4817507796 -06 58 18.650158294     19.2     L0.2V 33 0
5 NTTDF J1205-0744 BD* 12 05 20.21 -07 44 01.0           T7 12 1
6 DENIS J1208.5+0149 LM* 12 08 31.52064 +01 49 24.8376           M9V 13 0
7 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 134 0
8 SDSS J130150.34+002314.8 BD? 13 01 50.34024 +00 23 14.8452           ~ 2 0
9 ULAS J130153.49+002044.9 BD? 13 01 53.48568 +00 20 44.5452           ~ 1 0
10 ULAS J130519.86+001402.9 BD? 13 05 19.85448 +00 14 02.9220           ~ 1 0
11 DENIS J1431.0-1953 * 14 31 01.26288 -19 53 48.9768           ~ 8 0
12 ULAS J145243.59+065542.9 BD* 14 52 43.57968 +06 55 42.9168           T4.5 5 0
13 ULAS J152347.60+052849.4 BD? 15 23 47.61319 +05 28 49.5798           ~ 1 0
14 2MASS J15310888+0601112 BD* 15 31 08.88216 +06 01 11.2512           L1 5 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2007A&A...466.1059K and select 'bookmark this link' or equivalent in the popup menu


2020.08.08-20:27:34

© Université de Strasbourg/CNRS

    • Contact