2010A&A...518A..39D


Query : 2010A&A...518A..39D

2010A&A...518A..39D - Astronomy and Astrophysics, volume 518, A39-39 (2010/7-2)

Extending the Canada-France Brown Dwarfs Survey to the near-infrared: first ultracool brown dwarfs from CFBDSIR.

DELORME P., ALBERT L., FORVEILLE T., ARTIGAU E., DELFOSSE X., REYLE C., WILLOTT C.J., BERTIN E., WILKINS S.M., ALLARD F. and ARZOUMANIAN D.

Abstract (from CDS):

We present the first results of the ongoing Canada-France Brown Dwarfs Survey-InfraRed, hereafter CFBDSIR, a near infrared extension to the optical wide-field survey CFBDS. Our final objectives are to constrain ultracool atmosphere physics by finding a statistically significant sample of objects cooler than 650K and to explore the ultracool brown dwarf mass function building on a well-defined sample of such objects. We identify candidates in CFHT/WIRCam J and CFHT/MegaCam z' images using optimised psf-fitting, and follow them up with pointed, near-infrared imaging with SOFI at the NTT. We finally obtain low-resolution spectroscopy of the coolest candidates to characterise their atmospheric physics. We have so far analysed and followed up all candidates on the first 66 square degrees of the 335 square degree survey. We identified 55 T-dwarfs candidates with z'-J>3.5 and have confirmed six of them as T-dwarfs, including 3 that are strong later-than-T8 candidates, based on their far-red and NIR colours. We also present here the NIR spectra of one of these ultracool dwarfs, CFBDSIR1458+1013, which confirms it as one of the coolest brown dwarf known, possibly in the 550-600K temperature range. From the completed survey we expect to discover 10 to 15 dwarfs later than T8, more than doubling the known number of such objects. This will enable detailed studies of their extreme atmospheric properties and provide a stronger statistical basis for studies of their luminosity function.

Abstract Copyright:

Journal keyword(s): methods: observational - brown dwarfs - techniques: photometric - techniques: spectroscopic - methods: data analysis

Nomenclature: Paragr. 3.3, Tables 3-5: CFBDSIR JHHMMSS+DDMMSS N=3.

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 CFBDS J003402-005206 BD* 00 34 02.77416 -00 52 06.8196           T8+/Y? 49 0
2 CFBDS J005910-011401 BD* 00 59 10.46265 -01 14 00.5404           T9.0 38 0
3 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 160 0
4 2MASS J09393548-2448279 BD* 09 39 35.48976 -24 48 27.9432           T8 58 0
5 ULAS J133553.45+113005.2 BD* 13 35 53.45352 +11 30 05.1444           T8+/Y? 38 0
6 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 214 1
7 CFBDS J145829+101343 ** 14 58 29.40072 +10 13 41.7108           T8+Y0 30 0
8 Wolf 940 B BD* 21 46 38.829 -00 10 38.59           T8+/Y? 56 0
9 CFBDS J221505+003053 BD* 22 15 05.1 +00 30 53           T8+ 1 0
10 UDXS J221903.10+002418.2 BD* 22 19 03.10 +00 24 18.2           T6 4 0
11 CFBDS J232451-045852 BD? 23 24 51.0 -04 58 52           ~ 1 0

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2023.01.31-00:29:21

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