2008ApJ...676.1281M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST13:21:22

2008ApJ...676.1281M - Astrophys. J., 676, 1281-1306 (2008/April-1)

A cross-match of 2MASS and SDSS: newly found L and T dwarfs and an estimate of the space density of T dwarfs.

METCHEV S.A., KIRKPATRICK J.D., BERRIMAN G.B. and LOOPER D.

Abstract (from CDS):

We report new L and T dwarfs found in a cross-match of the SDSS Data Release 1 and 2MASS. Our simultaneous search of the two databases effectively allows us to relax the criteria for object detection in either survey and to explore the combined databases to a greater completeness level. We find two new T dwarfs in addition to the 13 already known in the SDSS DR1 footprint. We also identify 22 new candidate and bona fide L dwarfs, including a new young L2 dwarf and a peculiar potentially metal-poor L2 dwarf with unusually blue near-IR colors. These discoveries underscore the utility of simultaneous database cross-correlation in searching for rare objects. Our cross-match completes the census of T dwarfs within the joint SDSS and 2MASS flux limits to the ~97% level. Hence, we are able to accurately infer the space density of T dwarfs. We employ Monte Carlo tools to simulate the observed population of SDSS DR1 T dwarfs with 2MASS counterparts and find that the space density of T0-T8 dwarf systems is 0.0070+0.0032–0.0030pc–3 (95% confidence interval), i.e., about one per 140 pc3. Compared to predictions for the T dwarf space density that depend on various assumptions for the substellar mass function, this result is most consistent with models that assume a flat substellar mass function dN/dM∝M0.0. No >T8 dwarfs were discovered in the present cross-match, although less than one was expected in the limited area (2099 deg2) of SDSS DR1.

Abstract Copyright:

Journal keyword(s): stars: individual (2MASS J00521232+0012172) - stars: individual (2MASS J01040750-0053283) - stars: individual (2MASS J01262109+1428057) - stars: individual (2MASS J09175418+6028065) - stars: individual (2MASS J12144089+6316434) - stars: individual (2MASS J13243553+6358281) - stars: individual (2MASS J15461461+4932114) - Stars: Low-Mass, Brown Dwarfs - survey

VizieR on-line data: <Available at CDS (J/ApJ/676/1281): table1.dat table2.dat table3.dat table5.dat table6.dat table7.dat refs.dat>

Simbad objects: 54

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Number of rows : 54

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 2MASSI J0028394+150141 BD* 00 28 39.432 +15 01 41.86           L6.1:V 19 0
2 2MASS J00521232+0012172 BD* 00 52 12.322 +00 12 17.25           L2 6 0
3 2MASS J01040750-0053283 BD* 01 04 07.507 -00 53 28.37           L5.8:V 10 1
4 2MASS J01075242+0041563 BD* 01 07 52.422 +00 41 56.40           L8 45 0
5 2MASS J01262109+1428057 BD* 01 26 21.096 +14 28 05.75           L2 10 0
6 V* BF Ari BD* 01 51 41.559 +12 44 30.08           T0.0 61 0
7 2MASS J02074284+0000564 BD* 02 07 42.85 +00 00 56.4           T4.5 35 1
8 2MASS J02292794-0053282 BD? 02 29 27.949 -00 53 28.27           L: 8 0
9 2MASSI J0423485-041403 BD* 04 23 48.5838371891 -04 14 03.228116841           L6.5+T2 102 0
10 HD 289002 * 06 45 13.3726265810 +02 08 14.688016523 10.06 10.62 10.44     B1 219 0
11 2MASS J07354882+2720167 BD? 07 35 48.824 +27 20 16.74           L: 4 0
12 2MASS J08095903+4434216 BD* 08 09 59.038 +44 34 21.61           L7 14 0
13 V* IY Pup Mi* 08 19 23.0014700238 -28 15 05.624396397           M9 7 0
14 2MASSW J0820299+450031 BD* 08 20 29.961 +45 00 31.52           L5V 22 0
15 2MASS J08304878+0128311 BD* 08 30 48.784 +01 28 31.15           T4.5 19 0
16 SDSS J083717.21-000018.0 BD* 08 37 17.212 -00 00 18.08           T0.5 42 2
17 2MASS J09175418+6028065 BD* 09 17 54.182 +60 28 06.55           L: 4 0
18 2MASS J09261537+5847212 BD* 09 26 15.378 +58 47 21.23           T3.5+T5 28 0
19 2MASS J09264992+5230435 * 09 26 49.928 +52 30 43.53           L: 2 0
20 G 196-3B BD* 10 04 20.6389184345 +50 22 59.448807780           L2 89 0
21 2MASS J10440942+0429376 BD* 10 44 09.424 +04 29 37.70           L8.5 13 0
22 2MASS J11101001+0116130 BD* 11 10 10.011 +01 16 13.09           T5.5 58 0
23 2MASS J11191046+0552484 BD? 11 19 10.465 +05 52 48.49           L: 5 0
24 2MASS J11571680-0333279 * 11 57 16.808 -03 33 27.96           L: 2 0
25 2MASS J12074717+0244249 BD* 12 07 47.174 +02 44 24.93           L6.5+T2.5 50 0
26 2MASS J12144089+6316434 BD* 12 14 40.900 +63 16 43.44           T3.5 12 0
27 2MASS J12171110-0311131 BD* 12 17 11.103 -03 11 13.17           T7.5 76 0
28 2MASS J12172372-0237369 * 12 17 23.726 -02 37 36.90           L: 2 0
29 DENIS J122815.2-154733 BD* 12 28 15.232 -15 47 34.23       20.187 18.163 L5.5+L5.5 132 0
30 2MASS J12373919+6526148 BD* 12 37 39.196 +65 26 14.81           T6.5 62 0
31 2MASSW J1237392+652515 BD* 12 37 39.2 +65 25 15           T7 2 0
32 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 132 0
33 NAME Kelu-1 BD* 13 05 40.1737206066 -25 41 05.830344467         16.85 L2+L3.5 234 0
34 2MASS J13081228+6103486 * 13 08 12.284 +61 03 48.61           L: 2 0
35 2MASS J13141551-0008480 BD* 13 14 15.516 -00 08 48.04           L3.5 7 0
36 2MASS J13243553+6358281 BD* 13 24 35.538 +63 58 28.15           L8.0+T3.5 29 0
37 2MUCD 11143 BD* 13 26 29.819 -00 38 31.49           L7 36 0
38 2MASS J13464634-0031501 BD* 13 46 46.345 -00 31 50.13           T6.0 68 0
39 2MASS J14140586+0107102 BD? 14 14 05.860 +01 07 10.20           L: 5 0
40 2MASS J14232186+6154005 BD* 14 23 21.868 +61 54 00.50           L: 3 0
41 2MASS J15160303+0259292 BD* 15 16 03.04 +02 59 29.3           L7.5+T2.5 10 0
42 2MASS J15341068+0426410 BD? 15 34 10.686 +04 26 41.05           L: 3 0
43 2MASS J15422494+5522451 * 15 42 24.941 +55 22 45.16           ~ 2 0
44 2MASS J15423630-0045452 BD? 15 42 36.301 -00 45 45.24           L: 5 0
45 2MASS J15461461+4932114 BD* 15 46 14.618 +49 32 11.49           T2.5 7 0
46 2MASS J15513546+0151129 * 15 51 35.466 +01 51 12.98           L: 2 0
47 2MUCD 11538 BD* 16 15 42.552 +49 53 21.17           L4 31 0
48 2MASS J16241436+0029158 BD* 16 24 14.367 +00 29 15.82           T6V 131 0
49 2MASS J17164260+2945536 * 17 16 42.605 +29 45 53.61           L: 2 0
50 2MASS J17310140+5310476 BD* 17 31 01.408 +53 10 47.61           L5 7 0
51 2MASS J17373467+5953434 BD* 17 37 34.677 +59 53 43.43           L4+T5? 4 0
52 2MASS J21163374-0729200 * 21 16 33.743 -07 29 20.08           L: 4 0
53 2MASS J21203387-0747208 * 21 20 33.877 -07 47 20.86           L: 2 0
54 NAME Local Bubble ISM ~ ~           ~ 661 0

    Equat.    Gal    SGal    Ecl

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2019.10.21-13:21:22

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