2007AJ....134.1162L

Query : 2007AJ....134.1162L

2007AJ....134.1162L - Astron. J., 134, 1162-1182 (2007/September-0)

Discovery of 11 new T dwarfs in the Two Micron All Sky Survey, including a possible L/T transition binary.

LOOPER D.L., KIRKPATRICK J.D. and BURGASSER A.J.

Abstract (from CDS):

We present the discovery of 11 new T dwarfs, found during the course of a photometric survey for mid-to-late T dwarfs in the 2MASS Point Source Catalog and from a proper-motion-selected sample of ultracool dwarfs in the 2MASS Working Database. Using the NASA Infrared Telescope Facility SpeX spectrograph, we obtained low-resolution (R∼150) spectroscopy, allowing us to derive near-infrared spectral types of T2-T8. We also present improved signal-to-noise ratio SpeX low-resolution spectroscopy of the near-infrared T0 standard SDSS J120747.17+024424.8 and T1 standard SDSSp J083717.22-000018.3. One of these new T dwarfs, 2MASS J13243559+6358284, was also discovered independently by Metchev et al. This object is spectroscopically peculiar and possibly a binary and/or very young (<300 Myr). We specifically attempted to model the spectrum of this source as a composite binary to reproduce its peculiar spectral characteristics. The latest type object in our sample is a T8 dwarf, 2MASS J07290002-3954043, now one of the four latest type T dwarfs known. All 11 T dwarfs are nearby given their spectrophotometric distance estimates, with one T dwarf within 10 pc and eight additional T dwarfs within 25 pc, if single. These new additions increase the 25 pc census of T dwarfs by ∼14%. Their proximity offers an excellent opportunity to probe for companions at separations closer than are possible for more distant T dwarfs.

Abstract Copyright: ∼

Journal keyword(s): Stars: Low-Mass, Brown Dwarfs - Techniques: Spectroscopic

VizieR on-line data: <Available at CDS (J/AJ/134/1162): table2.dat table4.dat table9.dat refs.dat>

CDS comments: Several 2MASS names in table 3 are erroneous.

Simbad objects: 98

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Number of rows : 98
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 2MASS J00001354+2554180 BD* 00 00 13.54488 +25 54 18.0648           T4.5 31 0
2 V* DY Psc BY* 00 24 24.6317407560 -01 58 19.954412004     19.42 17.301 15.022 M9.5V 210 1
3 2MASS J00345157+0523050 BD* 00 34 51.57696 +05 23 05.0964           T6.5 34 0
4 * 54 Psc B BD* 00 39 18.91 +21 15 16.8           T7.5 76 1
5 2MASS J00501994-3322402 BD* 00 50 19.94352 -33 22 40.2708           T7 39 0
6 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11146 1
7 Wolf 47 Er* 01 03 19.8350070578 +62 21 55.837228636   15.34 13.21 12.4   M5V 200 0
8 2MASS J01072349+4759062 LM* 01 07 23.49912 +47 59 06.2340           M3 1 1
9 SIMP J013656.5+093347.3 BD* 01 36 56.5605419830 +09 33 47.311965969           T2.0 128 0
10 BRLT 38 BD* 01 51 41.55936 +12 44 30.0768           T0.5 68 0
11 2MASSI J0243137-245329 BD* 02 43 13.71792 -24 53 29.8356           T6.0 50 0
12 2MASS J03255322+0425406 BD* 03 25 53.22288 +04 25 40.6920           T5.5 18 0
13 2MASS J03480772-6022270 BD* 03 48 07.72104 -60 22 27.0624           T7 32 0
14 2MASS J04070885+1514565 BD* 04 07 08.85480 +15 14 56.5980           T5.5 18 0
15 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 165 0
16 2MASSI J0423485-041403 BD* 04 23 48.5763811987 -04 14 03.246502948           L6.5+T2 125 0
17 2MASS J05063725-3405090 LM* 05 06 37.2371035608 -34 05 09.031139988           M7 1 0
18 2MASS J05103524-4208146 BD* 05 10 35.24352 -42 08 14.6580           T5 11 1
19 2MASS J05160945-0445499 BD* 05 16 09.45840 -04 45 49.9392           T5.5 25 0
20 2MASS J05185995-2828372 BD* 05 18 59.95656 -28 28 37.2720           L6+T4 37 0
21 2MASS J05273568-1813489 LM* 05 27 35.6990817840 -18 13 48.911199312           M4 1 1
22 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2331 0
23 [BZR99] S Ori 70 BD* 05 38 10.10 -02 36 26.0           T6-7 47 0
24 Ross 47 BY* 05 42 09.2676872099 +12 29 21.604835564 14.264 13.130 11.509 10.298 8.709 M4V 268 0
25 2MASS J05591914-1404488 BD* 05 59 19.1872549354 -14 04 49.206913185           T4.5 150 0
26 2MASS J06020638+4043588 BD* 06 02 06.38496 +40 43 58.8900           T4.5 13 0
27 HD 42581 Er* 06 10 34.6149358167 -21 51 52.656352926 10.801 9.607 8.125 7.164 6.121 M1V 478 0
28 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 504 0
29 2MASSI J0727182+171001 BD* 07 27 18.24600 +17 10 01.2072           T7.0 91 0
30 2MASS J07290002-3954043 BD* 07 29 00.02496 -39 54 04.3992           T8pec 30 0
31 2MASS J07414920+2351275 BD* 07 41 49.20936 +23 51 27.5076           T5 18 0
32 2MASS J07420130+2055198 BD* 07 42 01.30152 +20 55 19.8840           T5 17 0
33 2MASSI J0755480+221218 BD* 07 55 47.95488 +22 12 16.9416           T5.2 32 0
34 2MASS J07584037+3247245 BD* 07 58 40.3517739525 +32 47 23.984796389           T0.0+T3.5 45 0
35 * pi.01 Cnc C BD* 09 12 14.69112 +14 59 39.6240           L8.5+L7.5 56 1
36 2MASS J09162684+0628393 LM* 09 16 26.8517896296 +06 28 38.960099256           M6.5 1 1
37 2MASSW J0920122+351742 BD* 09 20 12.23664 +35 17 42.9684           L5.5+L9 46 0
38 2MASS J09212898-0339410 LM* 09 21 28.98720 -03 39 41.0472           M7: 1 1
39 2MASS J09261537+5847212 BD* 09 26 15.37752 +58 47 21.2280           T3.5+T5 34 0
40 2MASS J09351549+0019103 LM* 09 35 15.49920 +00 19 10.3620           M7: 1 0
41 2MASSI J0937347+293142 BD* 09 37 34.87968 +29 31 40.9908           T6 89 0
42 2MASS J09393548-2448279 BD* 09 39 35.48976 -24 48 27.9432           T8 59 0
43 2MASS J10073369-4555147 BD* 10 07 33.69888 -45 55 14.7108           T5 14 0
44 V* AD Leo Er* 10 19 36.2808181226 +19 52 12.010446571   10.82 9.52 9.19   dM3 1340 1
45 2MASSW J1047539+212423 BD* 10 47 53.85456 +21 24 23.4684           T6.5 86 0
46 2MASS J10521350+4422559 BD* 10 52 13.50504 +44 22 55.9128           L6.5+T1.5 33 0
47 Wolf 359 Er* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 721 0
48 HD 95735 Er* 11 03 20.1948195942 +35 58 11.576182057 10.030 8.960 7.520 5.99 4.79 M2+V 715 0
49 2MASS J11061197+2754225 BD* 11 06 11.9261120247 +27 54 21.827590955           T0.0+T4.5 29 0
50 2MASS J11101001+0116130 BD* 11 10 10.01064 +01 16 13.0872           T5.5 76 0
51 2MASS J11145133-2618235 BD* 11 14 51.33720 -26 18 23.5620           T7.5 42 0
52 2MASS J11220826-3512363 BD* 11 22 08.2584613608 -35 12 36.580608360           T2 24 0
53 2MASS J12074717+0244249 BD* 12 07 47.17296 +02 44 24.9576           L6.5+T2.5 66 0
54 2MASS J12154430-3420594 BD* 12 15 44.30544 -34 20 59.4600           T4.5 8 0
55 2MASS J12171110-0311131 BD* 12 17 11.10288 -03 11 13.1748           T7.5 85 0
56 2MASS J12255432-2739466 BD* 12 25 54.32328 -27 39 46.6776           T5.5+T8 61 0
57 ULAS2MASS J1231+0847 BD* 12 31 47.53608 +08 47 33.1116           T6 34 0
58 2MASS J12373919+6526148 BD* 12 37 39.19632 +65 26 14.8092           T6.5 73 0
59 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 150 0
60 2MASS J13243553+6358281 BD* 13 24 35.53752 +63 58 28.1532           L8.0+T3.5 49 0
61 2MASS J13464634-0031501 BD* 13 46 46.34496 -00 31 50.1312           T6 75 0
62 2MASS J14044948-3159330 BD* 14 04 49.48416 -31 59 33.0576           T1+T5 32 1
63 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 205 0
64 LP 271-25 LM* 14 28 43.2275214164 +33 10 39.259309081   21.2   17.8   M9Ve 250 0
65 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 225 1
66 2MASS J15031961+2525196 BD* 15 03 19.6109033841 +25 25 19.795679019           T5.5 70 0
67 CFBDS J150411+102717 BD* 15 04 11.72688 +10 27 16.9128           T7.0 26 0
68 SDSS J151114.65+060742.9 BD* 15 11 14.66280 +06 07 43.1652           T2.0 35 0
69 2MASS J15203974+3546210 BD* 15 20 39.74688 +35 46 21.0396           T0.0 26 0
70 2MASSI J1534498-295227 BD* 15 34 49.84080 -29 52 27.4188           T4.5+T5 66 0
71 2MASSI J1546271-332511 BD* 15 46 27.18600 -33 25 11.1828           T5.7 31 1
72 2MASS J15530228+1532369 BD* 15 53 02.28072 +15 32 36.9132           T6.5+T7.5 55 0
73 2MASS J16150413+1340079 BD* 16 15 04.13496 +13 40 07.9284           T6 17 0
74 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 145 0
75 2MASS J16283855+2308241 BD* 16 28 38.55000 +23 08 24.1980           T7.0 20 0
76 2MASS J16293704+1415435 LM* 16 29 37.0256549160 +14 15 43.671536568           M6: 1 1
77 2MASS J16302295+0818221 BD* 16 30 22.95864 +08 18 22.1616           T5.5 11 0
78 VB 8 LM* 16 55 35.2557374336 -08 23 40.753073075   18.7 16.916 14.566 12.24 M7Ve 430 0
79 SDSS J175805.46+463311.9 BD* 17 58 05.45496 +46 33 09.9108           T7 40 0
80 2MASS J18283572-4849046 BD* 18 28 35.72256 -48 49 04.6380           T6 26 0
81 SCR J1845-6357B BD? 18 45 05.47 -63 57 46.3           ~ 34 0
82 2MASS J19010601+4718136 BD* 19 01 06.01920 +47 18 13.6620           T5 15 0
83 VB 10 Er* 19 16 57.6109547886 +05 09 01.600923413     17.30     M8V 476 1
84 2MASS J20014678-3805408 LM* 20 01 46.8002025888 -38 05 40.841721960           M4 1 1
85 CFBDS J212413+010002 BD* 21 24 13.87968 +00 59 59.9172           T6 23 0
86 CFBDS J213926+022023 BD* 21 39 26.76936 +02 20 22.6968           L8.5+T3.5 90 0
87 V* HN Peg B BD* 21 44 28.47168 +14 46 07.7988           T2.5 126 0
88 V* HN Peg BY* 21 44 31.3299461136 +14 46 18.983292600       6.16   G0V+ 515 0
89 2MASS J21513839-4853542 BD* 21 51 38.39304 -48 53 54.2508           T4.5 17 0
90 2MASS J21542494-1023022 BD* 21 54 24.94272 -10 23 02.2200           T4.5 4 0
91 2MASS J21543318+5942187 BD* 21 54 33.18696 +59 42 18.7740           T6 15 0
92 * eps Ind B BD* 22 04 10.5951812451 -56 46 58.239102418     24.12 20.8 15.60 T1V+T6V 163 1
93 2MASS J22282889-4310262 BD* 22 28 28.89432 -43 10 26.2740           T6.5 66 0
94 2MASS J22535465-0321452 LM* 22 53 54.6443176584 -03 21 45.304406100           M6 1 1
95 2MASSI J2254188+312349 BD* 22 54 18.92016 +31 23 49.8300           T5.0 70 0
96 2MASS J23312378-4718274 BD* 23 31 23.78712 -47 18 27.4356           T5 21 0
97 2MASSI J2339101+135230 BD* 23 39 10.25160 +13 52 28.4772           T5.4 28 0
98 2MASSI J2356547-155310 BD* 23 56 54.77040 -15 53 11.1336           T5.8 43 0

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