2015AJ....150..182K

Query : 2015AJ....150..182K

2015AJ....150..182K - Astron. J., 150, 182 (2015/December-0)

A targeted search for peculiarly red L and T dwarfs in SDSS, 2MASS, and WISE: discovery of a possible L7 member of the TW Hydrae association.

KELLOGG K., METCHEV S., GEISSLER K., HICKS S., KIRKPATRICK J.D. and KURTEV R.

Abstract (from CDS):

We present the first results from a targeted search for brown dwarfs with unusual red colors indicative of peculiar atmospheric characteristics. These include objects with low surface gravities or with unusual dust content or cloud properties. From a positional cross-match of SDSS, 2MASS, and WISE, we have identified 40 candidate peculiar early-L to early-T dwarfs that are either new objects or have not been identified as peculiar through prior spectroscopy. Using low-resolution spectra, we confirm that 10 of the candidates are either peculiar or potential L/T binaries. With a J - Ks color of 2.62±0.15 mag, one of the new objects–the L7 dwarf 2MASS J11193254-1137466–is among the reddest field dwarfs currently known. Its proper motion and photometric parallax indicate that it is a possible member of the TW Hydrae moving group. If confirmed, it would be the lowest-mass (5-6 MJup) free-floating member. We also report a new T dwarf, 2MASS J22153705+2110554, that was previously overlooked in the SDSS footprint. These new discoveries demonstrate that despite the considerable scrutiny already devoted to the SDSS and 2MASS surveys, our exploration of these data sets is not yet complete.

Abstract Copyright: ∼

Journal keyword(s): binaries: close - brown dwarfs - infrared: stars - stars: late-type - stars: peculiar

CDS comments: 2MASS J16094569+1426422 and 2MASS J17251557+6405005 not identified (do not exist in the 2MASS catalog), not in Simbad.

Simbad objects: 90

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Number of rows : 90
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 J00282091+2249050 BD* 00 28 20.91144 +22 49 05.0016           L6.0 15 0
2 HD 2717 * 00 30 36.9271814688 -09 23 42.472563576   10.10 9.93     A2III 8 0
3 2MASS J00470038+6803543 BD* 00 47 00.38664 +68 03 54.3672           L9pec 77 0
4 BRLT 38 BD* 01 51 41.55936 +12 44 30.0768           T0.5 68 0
5 2MASS J01550354+0950003 BD* 01 55 03.5501844443 +09 50 00.395365641           L4 19 0
6 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 165 0
7 HD 57450 * 07 21 54.7651943400 +16 40 44.195876868   9.28 9.30     A0V 8 0
8 * 47 Cam * 07 22 17.1847964400 +59 54 07.187934384 6.770 6.620 6.350     A8m 39 0
9 2MASS J07483864+1743329 BD* 07 48 38.642 +17 43 33.00           L5 4 0
10 2MASS J08095903+4434216 BD* 08 09 59.03832 +44 34 21.6120           L6.0 19 0
11 2MASS J08350622+1953050 BD* 08 35 06.22944 +19 53 05.0532           L5 39 0
12 HD 75135 * 08 49 47.2937390376 +44 42 15.378717132   8.04 7.94     A0 19 0
13 2MASS J09572983+4624177 BD* 09 57 29.831 +46 24 17.79           L6 5 0
14 2MASS J10020752+1358556 BD* 10 02 07.522 +13 58 55.70           L7+T8? 2 0
15 2MASS J10101480-0406499 BD* 10 10 14.80704 -04 06 49.9320           L6 60 0
16 HD 95126 * 10 59 40.2075414048 +45 47 18.888822276   8.88 8.89     A0V 31 0
17 NAME TW Hya Association As* 11 01.9 -34 42           ~ 942 0
18 HD 97516 * 11 13 17.6664624336 -13 48 11.670812028   8.92 8.82     A0V 17 0
19 TWA 42 BD* 11 19 32.54328 -11 37 46.6968           L7 38 0
20 2MASS J11260310+4819256 BD* 11 26 03.101 +48 19 25.65           L5 1 0
21 HD 99966 * 11 30 29.8370585520 +48 56 08.557939932   7.33 7.39     A0V 45 0
22 2MASS J12074717+0244249 BD* 12 07 47.17296 +02 44 24.9576           L6.5+T2.5 66 0
23 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 150 0
24 2MASS J13043568+1542521 BD* 13 04 35.682 +15 42 52.14           L6+T6? 2 0
25 NAME Kelu-1 BD* 13 05 40.1642434199 -25 41 05.712165150         16.85 L2+L3.5 254 0
26 2MASS J13243553+6358281 BD* 13 24 35.53752 +63 58 28.1532           L8.0+T3.5 49 0
27 2MASSW J1343167+394508 BD* 13 43 16.54272 +39 45 09.2268           L5V 18 0
28 HD 121880 PM* 13 57 52.1210809392 +16 12 07.519530456   7.646 7.583     A0V 25 0
29 2MASS J14025564+0800553 BD* 14 02 55.64328 +08 00 55.3248           L8+T5? 12 0
30 HD 123233 PM* 14 06 09.5676700560 +09 53 43.249342812   8.71 8.63     A0V 28 0
31 HD 125798 * 14 20 50.7293036088 +36 23 32.599087476   7.548 7.338     A0 24 0
32 2MASS J14313097+1436539 BD* 14 31 30.9245665010 +14 36 53.851624497           L1 15 0
33 2MASS J15031961+2525196 BD* 15 03 19.6109033841 +25 25 19.795679019           T5.5 70 0
34 SDSS J151114.65+060742.9 BD* 15 11 14.66280 +06 07 43.1652           T2.0 35 0
35 2MASS J16005759+3021571 BD* 16 00 57.55200 +30 21 57.2076           L5 2 0
36 2MASS J16091143+2116584 BD* 16 09 11.439 +21 16 58.45           L2 2 0
37 2MASS J16110632+0025469 BD* 16 11 06.31848 +00 25 47.0244           L0 3 0
38 2MASS J16135698+4019158 BD* 16 13 56.987 +40 19 15.86           L5red 1 0
39 2MASS J16231308+3950419 BD* 16 23 13.089 +39 50 41.99           L3 1 0
40 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 145 0
41 2MASS J16242936+1251451 LM* 16 24 29.36 +12 51 45.1           M9 2 0
42 2MASS J16304999+0051010 BD* 16 30 50.00400 +00 51 01.3536           L2 8 0
43 2MASS J16322360+2839567 BD* 16 32 23.60328 +28 39 56.7828           L1 2 0
44 2MASS J16322911+1904407 BD* 16 32 29.11416 +19 04 40.7136       22.42 19.98 L8V 131 0
45 2MASS J16360752+2336011 BD* 16 36 07.53 +23 36 01.1           L1 2 0
46 2MASS J16370238+2520386 BD* 16 37 02.387 +25 20 38.65           L4 1 0
47 2MASS J16403870+5215505 * 16 40 38.709 +52 15 50.57           M9 1 0
48 2MASS J16410015+1335591 BD* 16 41 00.159 +13 35 59.18           L2 2 0
49 HD 151353 * 16 45 05.7871912272 +40 38 17.458813752   8.29 8.16     A0 12 0
50 2MASS J16470847+5120088 * 16 47 08.479 +51 20 08.87           M9 1 0
51 HD 152531 * 16 53 21.1859545200 +15 24 29.125773468   7.61 7.58     A0 13 0
52 2MASS J16592987+2055298 * 16 59 29.8913824584 +20 55 29.580216924           M9 1 0
53 HD 153650 * 16 59 34.8838994712 +29 32 58.110267048   7.92 7.86     A0 21 0
54 HD 153940 * 17 03 06.8938401936 -15 52 20.571427092   9.86 9.56     A0V 5 0
55 2MASS J17081563+2557474 BD* 17 08 15.630 +25 57 47.44           L5red 4 0
56 HD 155838 * 17 11 17.6549995248 +51 45 15.671472408 7.320 7.240 7.140     A0 19 0
57 2MASS J17145224+2439024 * 17 14 52.242 +24 39 02.50           M9 1 0
58 2MASS J17161258+4125143 BD* 17 16 12.586 +41 25 14.31           L4 2 0
59 HD 157359 * 17 21 49.6391443392 +23 41 10.718700504   7.38 7.41     A0 16 0
60 HD 158261 SB* 17 26 46.1453093400 +34 41 44.883897900 5.87 5.93 5.94     A0V 59 0
61 2MASS J17373467+5953434 BD* 17 37 34.67712 +59 53 43.4292           L4+T5? 6 0
62 2MASS J17410280-4642218 BD* 17 41 02.80656 -46 42 21.8520           L5:gamma 23 0
63 HD 164728 * 18 01 34.2183025296 +25 29 22.625063484   7.571 7.592     A0 17 0
64 HD 165622 * 18 02 24.7560100392 +63 35 46.301490384   8.21 8.16     A0 4 0
65 HD 165623 SB* 18 04 48.8086433832 +42 57 27.958806684   7.45 7.29     A0 12 0
66 HD 166639 * 18 07 57.8687940480 +59 01 14.782936008   8.26 8.24     A0 10 0
67 2MASS J21050130-0533505 * 21 05 01.2819918288 -05 33 50.732392104           M7 1 0
68 2MASS J21111559-0543437 * 21 11 15.5457798984 -05 43 44.133911832           M9 1 0
69 2MASS J21115335-0644172 * 21 11 53.359 -06 44 17.24           M9 1 0
70 2MASS J21140802-2251358 BD* 21 14 08.02560 -22 51 35.8380           L7.5 111 0
71 2MASS J21203483-0747378 BD* 21 20 34.8141641064 -07 47 37.771036116           L2 1 0
72 2MASS J21243864+1849263 BD* 21 24 38.650 +18 49 26.32           L9 3 0
73 2MASS J21392224+1124323 * 21 39 22.242 +11 24 32.38           M8 1 0
74 CFBDS J213926+022023 BD* 21 39 26.76936 +02 20 22.6968           L8.5+T3.5 90 0
75 2MASSI J2158045-155009 BD* 21 58 04.5716969232 -15 50 09.793729140       20.771 18.582 L4 49 0
76 HD 209051 * 22 00 39.9766909200 -06 25 57.066351060   8.72 8.76     ApSi(Cr) 16 0
77 HD 210265 * 22 09 04.1895808124 +09 27 04.250279101   8.01 7.93     A0 7 0
78 HD 210253 * 22 09 15.9294490488 -07 14 27.707764884   8.67 8.63     A0IV 9 0
79 2MASS J22153705+2110554 BD* 22 15 37.05648 +21 10 55.4916           T0+T2? 11 0
80 2MASS J22271087-0045471 BD* 22 27 10.913 -00 45 47.31           L7.0 15 0
81 2MASS J22443167+2043433 BD* 22 44 31.67376 +20 43 43.3020           L6-L8gamma 99 0
82 2MASS J22483513+1301453 * 22 48 35.135 +13 01 45.34           M9 1 0
83 2MASS J23023319-0935188 * 23 02 33.200 -09 35 18.89           M7 1 0
84 2MASS J23174712-4838501 BD* 23 17 47.1109705896 -48 38 50.251521552           L5 17 0
85 HD 220184 * 23 21 38.8080517896 +13 11 13.376770116   8.44 8.38     A0 8 0
86 2MASS J23322678+1234530 BD* 23 32 26.78784 +12 34 53.0292           L6p+T4p 5 0
87 V* DK Peg EB* 23 41 33.5078367192 +10 12 57.053108088   10.12 9.92     A5 50 0
88 2MASS J23443744-0855075 * 23 44 37.450 -08 55 07.58           M9 1 0
89 HD 222903 * 23 44 42.0058922304 -08 27 45.701308296   8.50 8.24     A1mA6-F2 12 0
90 2MASS J23512200+3010540 BD* 23 51 22.00512 +30 10 54.0012           L6.5 14 0

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