2010A&A...522A.112R

Query : 2010A&A...522A.112R

2010A&A...522A.112R - Astronomy and Astrophysics, volume 522, A112-112 (2010/11-1)

The ultracool-field dwarf luminosity-function and space density from the Canada-France Brown Dwarf Survey.

REYLE C., DELORME P., WILLOTT C.J., ALBERT L., DELFOSSE X., FORVEILLE T., ARTIGAU E., MALO L., HILL G.J. and DOYON R.

Abstract (from CDS):

Thanks to recent and ongoing large scale surveys, hundreds of brown dwarfs have been discovered in the last decade. The Canada-France Brown Dwarf Survey is a wide-field survey for cool brown dwarfs conducted with the MegaCam camera on the Canada-France-Hawaii Telescope. Our objectives are to find ultracool brown dwarfs and to constrain the field brown-dwarf luminosity function and the mass function from a large and homogeneous sample of L and T dwarfs. We identify candidates in CFHT/MegaCam i' and z' images and follow them up with pointed near infrared (NIR) imaging on several telescopes. Halfway through our survey we found ∼50 T dwarfs and ∼170 L or ultra cool M dwarfs drawn from a larger sample of 1400 candidates with typical ultracool dwarfs i'-z' colours, found in 780 square degrees. We have currently completed the NIR follow-up on a large part of the survey for all candidates from mid-L dwarfs down to the latest T dwarfs known with utracool dwarfs' colours. This allows us to draw on a complete and well defined sample of 102 ultracool dwarfs to investigate the luminosity function and space density of field dwarfs. We found the density of late L5 to T0 dwarfs to be 2.0+0.8–0.7x10–3objects/pc3, the density of T0.5 to T5.5 dwarfs to be 1.4+0.3–0.2x10–3objects/pc3, and the density of T6 to T8 dwarfs to be 5.3+3.1–2.2x10–3objects/pc3. We found that these results agree better with a flat substellar mass function. Three latest dwarfs at the boundary between T and Y dwarfs give the high density 8.3+9.0–5.1x10–3 objects pc–3. Although the uncertainties are very large this suggests that many brown dwarfs should be found in this late spectral type range, as expected from the cooling of brown dwarfs, whatever their mass, down to very low temperature.

Abstract Copyright: ∼

Journal keyword(s): stars: low-mass - brown dwarfs - stars: luminosity function, mass function - Galaxy: stellar content

VizieR on-line data: <Available at CDS (J/A+A/522/A112): table2.dat table5.dat>

Nomenclature: Table 5: CFBDS JHHMMSS+DDMMSS N=103.

Simbad objects: 151

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Number of rows : 151
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME L 362-29 BC BD* 00 04 34.8671722377 -40 44 06.463544237       19.61 16.88 L5+L5 111 0
2 L 362-29 PM* 00 04 36.4375346731 -40 44 02.880162313   14.47 12.84 12.525   M4V 79 0
3 CFBDS J001851+342725 BD? 00 18 51.37 +34 27 25.7           ~ 1 0
4 2MASSI J0028394+150141 BD* 00 28 39.43224 +15 01 41.8620           L4.5V 21 0
5 CFBDS J003214+025604 BD? 00 32 14.37 +02 56 04.7           ~ 1 0
6 CFBDS J003402-005206 BD* 00 34 02.77416 -00 52 06.8196           T8+/Y? 49 0
7 CFBDS J003448-020500 BD? 00 34 48.76 -02 05 00.6           ~ 1 0
8 LSPM J0036+1821 BD* 00 36 16.1118891182 +18 21 10.286665966       18.451 16.053 L3.5 213 0
9 CFBDS J004037+035316 BD? 00 40 37.76 +03 53 16.7           ~ 1 0
10 CFBDS J004148-013353 BD? 00 41 48.71 -01 33 53.8           ~ 1 0
11 CFBDS J004526+354711 BD? 00 45 26.33 +35 47 11.4           ~ 1 0
12 2MASS J00492826+0440575 BD* 00 49 28.26768 +04 40 57.5688           L9 11 0
13 CFBDS J005107+014105 BD? 00 51 07.95 +01 41 06.0           ~ 1 0
14 CFBDS J005304-020025 BD? 00 53 04.70 -02 00 25.3           ~ 1 0
15 CFBDS J005336+045214 BD? 00 53 36.13 +04 52 14.4           ~ 1 0
16 CFBDS J005350+050002 BD? 00 53 50.41 +05 00 02.2           ~ 1 0
17 CFBDS J005700-032943 BD? 00 57 00.41 -03 29 43.6           ~ 1 0
18 CFBDS J005910-011401 BD* 00 59 10.46265 -01 14 00.5404           T9.0 38 0
19 2MASS J01040750-0053283 BD* 01 04 07.50744 -00 53 28.3704           L5.0 11 1
20 CFBDS J010608+340520 BD? 01 06 08.60 +34 05 20.2           ~ 1 0
21 2MASS J01075242+0041563 BD* 01 07 52.42200 +00 41 56.3964           L8 55 0
22 CFBDS J011159+330807 BD? 01 11 59.09 +33 08 07.9           ~ 1 0
23 BRLT 38 BD* 01 51 41.55936 +12 44 30.0768           T0.5 68 0
24 DENIS J020529.0-115925 BD* 02 05 29.3651195393 -11 59 29.721210536           L7V 150 0
25 2MASS J02060880+2235593 BD* 02 06 08.80008 +22 35 59.3340           L4.5 11 0
26 2MASS J02361794+0048548 BD* 02 36 17.94024 +00 48 54.8208           L6V 20 0
27 CFBDS J025232-162255 BD? 02 52 32.48 -16 22 55.4           ~ 1 0
28 CFBDS J025242-173225 BD? 02 52 42.95 -17 32 25.3           ~ 1 0
29 CFBDS J025401-182529 BD* 02 54 01.67 -18 25 29.3           T6.5 3 0
30 CFBDS J025418-135237 BD? 02 54 18.26 -13 52 37.2           ~ 1 0
31 CFBDS J025420-170744 BD? 02 54 20.68 -17 07 44.4           ~ 1 0
32 CFBDS J025445-140314 BD? 02 54 45.64 -14 03 14.9           ~ 1 0
33 CFBDS J025558-173020 BD* 02 55 58.46 -17 30 20.3           T1.0 2 0
34 CFBDS J025612-125721 BD? 02 56 12.28 -12 57 21.4           ~ 1 0
35 CFBDS J025718-124853 BD* 02 57 18.08 -12 48 53.1           T3.5 2 0
36 CFBDS J025805-145534 BD* 02 58 05.92 -14 55 34.3           T1.5 2 0
37 CFBDS J025840-182648 BD* 02 58 40.60 -18 26 48.3           T2.5 2 0
38 CFBDS J025947-113619 BD? 02 59 47.10 -11 36 19.1           ~ 1 0
39 CFBDS J030130-104504 BD* 03 01 30.53 -10 45 04.4           T6.0 3 0
40 CFBDS J030148-134948 BD? 03 01 48.80 -13 49 48.9           ~ 1 0
41 CFBDS J030225-144125 BD* 03 02 25.88 -14 41 25.5           T6.0 3 0
42 CFBDS J030226-143719 BD* 03 02 26.67 -14 37 19.2           T4.0 2 0
43 CFBDS J030421-135836 BD? 03 04 21.58 -13 58 36.7           ~ 1 0
44 CFBDS J030719-171532 BD? 03 07 19.75 -17 15 32.3           ~ 1 0
45 CFBDS J031011-162225 BD? 03 10 11.40 -16 22 25.3           ~ 1 0
46 CFBDS J031028-102928 BD? 03 10 28.48 -10 29 28.9           ~ 1 0
47 2MASSW J0310599+164816 BD* 03 10 59.86560 +16 48 15.5988           L8V 49 0
48 CFBDS J031859-170527 BD? 03 18 59.69 -17 05 27.8           ~ 1 0
49 CFBDS J031900-171036 BD? 03 19 00.22 -17 10 36.0           ~ 1 0
50 CFBDS J032438-124030 BD? 03 24 38.38 -12 40 30.9           ~ 1 0
51 CFBDS J032602-133927 BD? 03 26 02.49 -13 39 27.7           ~ 1 0
52 2MASSI J0328426+230205 BD* 03 28 42.65592 +23 02 05.1900           L9.5 47 0
53 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1616128256 +25 40 23.239779672         17.36 L0V 126 0
54 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3433 0
55 CFBDS J040027-085753 BD? 04 00 27.15 -08 57 54.0           ~ 1 0
56 CFBDS J040420-081829 BD? 04 04 20.89 -08 18 29.1           ~ 1 0
57 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 165 0
58 2MASSI J0423485-041403 BD* 04 23 48.5763811987 -04 14 03.246502948           L6.5+T2 125 0
59 SIPS J0539-0059 BD* 05 39 52.0040375405 -00 59 01.491092352           L5V 88 0
60 2MASS J05591914-1404488 BD* 05 59 19.1872549354 -14 04 49.206913185           T4.5 150 0
61 HD 42581 Er* 06 10 34.6149358167 -21 51 52.656352926 10.801 9.607 8.125 7.164 6.121 M1V 478 0
62 2MASSI J0727182+171001 BD* 07 27 18.24600 +17 10 01.2072           T7.0 91 0
63 2MASS J07584037+3247245 BD* 07 58 40.3517739525 +32 47 23.984796389           T0.0+T3.5 45 0
64 2MASS J08053189+4812330 BD* 08 05 31.8496436040 +48 12 33.131831320           L4+T5 42 0
65 2MASSI J0825196+211552 BD* 08 25 19.6125672818 +21 15 51.549358145       21.97 19.22 L7.5V 123 0
66 2MASS J08300825+4828482 BD* 08 30 08.1496038211 +48 28 47.538657498           L9.5 45 0
67 CFBDS J083009+190427 BD? 08 30 09.57 +19 04 28.0           ~ 1 0
68 2MASS J08350622+1953050 BD* 08 35 06.22944 +19 53 05.0532           L5 39 0
69 SDSS J083717.21-000018.0 BD* 08 37 17.20032 -00 00 19.3608           T1 51 0
70 2MASS J08575849+5708514 BD* 08 57 58.4721442289 +57 08 51.414025854           L7V 47 0
71 CFBDS J085833+173453 BD? 08 58 33.25 +17 34 53.5           ~ 1 0
72 CFBDS J090139+174051 BD* 09 01 39.82 +17 40 51.4           T3.5 2 0
73 CFBDS J090449+165347 BD* 09 04 49.60 +16 53 47.1           T4.0 2 0
74 2MASS J09083803+5032088 BD* 09 08 38.0091771633 +50 32 08.205341214           L8 46 0
75 CFBDS J092250+152741 BD* 09 22 50.12 +15 27 41.4           T7.0 6 0
76 2MASS J09261537+5847212 BD* 09 26 15.37752 +58 47 21.2280           T3.5+T5 34 0
77 2MASS J10210969-0304197 BD* 10 21 09.69240 -03 04 19.7904           T1+T4 75 0
78 CFBDS J102841+565401 BD* 10 28 41.01 +56 54 01.9           T8.0 6 0
79 CFBDS J103018+094144 BD? 10 30 18.74 +09 41 44.7           ~ 1 0
80 CFBDS J103944+100737 BD? 10 39 44.90 +10 07 37.5           ~ 1 0
81 CFBDS J104055+084005 BD? 10 40 55.63 +08 40 05.4           ~ 1 0
82 CFBDS J104209+580856 BD* 10 42 09.98 +58 08 56.6           T6.5 3 0
83 CFBDS J105503+580827 BD? 10 55 03.16 +58 08 27.7           ~ 1 0
84 SIPS J1058-1548 BD* 10 58 47.8366017792 -15 48 17.250428304       20.095 17.764 L3V 100 2
85 2MASS J12144089+6316434 BD* 12 14 40.89984 +63 16 43.4352           T3.5 14 0
86 SIPS J1228-1547 BD* 12 28 15.23184 -15 47 34.2312       20.187 18.163 L5.5+L5.5 145 0
87 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 150 0
88 CFBDS J132400-081123 BD? 13 24 00.09 -08 11 23.3           ~ 1 0
89 2MASS J13262981-0038314 BD* 13 26 29.81880 -00 38 31.4880           L5.5V 41 0
90 CFBDS J132945-082730 BD? 13 29 45.70 -08 27 30.8           ~ 1 0
91 2MASS J13314894-0116500 BD* 13 31 48.9202570553 -01 16 51.118063680           L6V 41 0
92 CFBDS J133240-082314 BD? 13 32 40.95 -08 23 14.3           ~ 1 0
93 CFBDS J133407-092339 BD? 13 34 07.01 -09 23 39.8           ~ 1 0
94 2MASS J13464634-0031501 BD* 13 46 46.34496 -00 31 50.1312           T6 75 0
95 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 205 0
96 2MASS J14392836+1929149 BD* 14 39 28.1499428599 +19 29 15.908790370           L1V 131 0
97 2MASS J14460061+0024519 BD* 14 46 00.61560 +00 24 51.9660           L5V 35 0
98 CFBDS J145044+092108 BD* 14 50 44.96 +09 21 08.7           T3.0 2 0
99 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 225 1
100 CFBDS J145847+061402 BD* 14 58 47.93 +06 14 02.9           T2.0 2 0
101 LSPM J1459+0857B BD* 14 59 35.24616 +08 57 51.1632         17.92 T4.5 15 0
102 CFBDS J150000-182407 BD* 15 00 00.50 -18 24 07.4           T4.5 4 0
103 CFBDS J150210+035055 BD? 15 02 10.19 +03 50 55.5           ~ 1 0
104 CFBDS J150411+102717 BD* 15 04 11.72688 +10 27 16.9128           T7.0 26 0
105 CFBDS J150435+102638 BD? 15 04 35.21 +10 26 38.1           ~ 1 0
106 CFBDS J150724+072919 BD? 15 07 24.48 +07 29 19.1           ~ 1 0
107 2MASSW J1507476-162738 BD* 15 07 47.6758255542 -16 27 40.113982846     22.136 18.928 16.579 L5V 199 0
108 CFBDS J151010+075452 BD? 15 10 10.21 +07 54 52.9           ~ 1 0
109 CFBDS J151014+111325 BD? 15 10 14.33 +11 13 25.3           ~ 1 0
110 SDSS J151114.65+060742.9 BD* 15 11 14.66280 +06 07 43.1652           T2.0 35 0
111 CFBDS J151324+095345 BD? 15 13 24.98 +09 53 45.1           ~ 1 0
112 CFBDS J151546+061738 BD? 15 15 46.59 +06 17 38.7           ~ 1 0
113 CFBDS J151803+071645 BD* 15 18 03.64 +07 16 46.0           T2.5 2 0
114 CFBDS J151929+105059 BD? 15 19 29.92 +10 50 59.2           ~ 1 0
115 * eta CrB C BD* 15 23 22.63488 +30 14 56.2092           L8V 105 1
116 CFBDS J152514+111833 BD* 15 25 14.82 +11 18 33.2           T2.5 2 0
117 CFBDS J152655+034536 BD* 15 26 55.77552 +03 45 34.8336           T4.0 3 0
118 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 145 0
119 2MASS J16322911+1904407 BD* 16 32 29.11416 +19 04 40.7136       22.42 19.98 L8V 131 0
120 CFBDS J163658+393151 BD? 16 36 58.93 +39 31 51.3           ~ 1 0
121 CFBDS J163955+385519 BD? 16 39 55.89 +38 55 19.2           ~ 1 0
122 CFBDS J164357+415740 BD? 16 43 57.37 +41 57 40.6           ~ 1 0
123 CFBDS J165843+381155 BD? 16 58 43.55 +38 11 55.7           ~ 1 0
124 2MASS J17503293+1759042 BD* 17 50 32.93832 +17 59 04.2504           T3.5 51 0
125 CFBDS J203737-192202 BD* 20 37 37.07 -19 22 02.9           T0.0 2 0
126 CFBDS J203841-185012 BD* 20 38 41.41 -18 50 12.3           T3.0 2 0
127 CFBDS J204803-183212 BD* 20 48 03.61 -18 32 12.8           T4.5 2 0
128 CFBDS J212243+042942 BD* 21 22 43.69 +04 29 42.0           T2.0 2 0
129 CFBDS J212409-000452 BD? 21 24 09.76 -00 04 52.9           ~ 1 0
130 CFBDS J212413+010002 BD* 21 24 13.87968 +00 59 59.9172           T6 23 0
131 CFBDS J212702+002344 BD* 21 27 02.19 +00 23 44.7           T3.5 2 0
132 CFBDS J213221-000859 BD? 21 32 21.96 -00 08 59.9           ~ 1 0
133 CFBDS J213259-013827 BD? 21 32 59.92 -01 38 27.2           ~ 1 0
134 CFBDS J213607-022232 BD? 21 36 07.09 -02 22 32.7           ~ 1 0
135 CFBDS J213926+022023 BD* 21 39 26.76936 +02 20 22.6968           L8.5+T3.5 90 0
136 CFBDS J214048+002135 BD? 21 40 48.01 +00 21 35.5           ~ 1 0
137 CFBDS J214124+032249 BD? 21 41 24.58 +03 22 49.3           ~ 1 0
138 CFBDS J214127-002841 BD? 21 41 27.99 -00 28 41.8           ~ 1 0
139 CFBDS J214139-033739 BD* 21 41 39.77 -03 37 39.1           T1.0 2 0
140 Wolf 940 PM* 21 46 40.4228878204 -00 10 23.771502145   14.31 12.70 12.42   dM4.0 70 0
141 CFBDS J214720-005533 BD? 21 47 20.95 -00 55 33.0           ~ 1 0
142 CFBDS J215230-004504 BD? 21 52 30.47 -00 45 04.7           ~ 1 0
143 CFBDS J215352-013855 BD? 21 53 52.15 -01 38 55.4           ~ 1 0
144 CFBDS J215454-014416 BD? 21 54 54.06 -01 44 16.4           ~ 1 0
145 CFBDS J215918+030507 BD* 21 59 18.86 +03 05 07.1           T1: 3 0
146 CFBDS J221245-123038 BD? 22 12 45.12 -12 30 38.7           ~ 1 0
147 CFBDS J221706-120541 BD? 22 17 06.13 -12 05 41.1           ~ 1 0
148 CFBDS J222245-110731 BD? 22 22 45.34 -11 07 31.6           ~ 1 0
149 2MASSW J2224438-015852 BD* 22 24 43.8544128559 -01 58 53.284975671           L4.5V 139 0
150 CFBDS J223856+034947 BD* 22 38 56.30 +03 49 47.0           T2.0 2 0
151 2MASS J22443167+2043433 BD* 22 44 31.67376 +20 43 43.3020           L6-L8gamma 99 0

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