2016A&A...589A..26B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST06:19:31

2016A&A...589A..26B - Astronomy and Astrophysics, volume 589A, 26-26 (2016/5-1)

A non-uniform distribution of the nearest brown dwarfs.

BIHAIN G. and SCHOLZ R.-D.

Abstract (from CDS):

Context. The census of solar neighbours is still complemented by new discoveries, mainly of very low-mass, faint dwarfs, close to or within the substellar domain. These discoveries contribute to a better understanding of the field population; its origin in terms of Galactic dynamics and (sub)stellar formation and evolution. Also, the nearest stars and brown dwarfs at any given age allow the most precise direct characterization, including the search for planetary companions.
Aims. We aim to further assess the substellar census on the Galactic plane.
Methods. We projected the 136 stars and 26 brown dwarfs known at <6.5pc on the Galactic plane and evaluated their distributions.
Results. Stars present a uniform- and brown dwarfs a non-uniform distribution, with 21 objects behind the Sun and only five ahead relative to the direction of rotation of the Galaxy. This substellar configuration has a probability of 0.098+10.878–0.098% relative to uniformity. The helio- and geocentric nature of the distribution suggests it might result in part from an observational bias, which if compensated for by future discoveries, might increase the brown-dwarf-to-star ratio, shifting it closer to values found in some star forming regions.

Abstract Copyright: © ESO, 2016

Journal keyword(s): astrometry - proper motions - stars: distances - stars: kinematics and dynamics - brown dwarfs - solar neighborhood

Simbad objects: 49

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Number of rows : 49

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 WISE J000517.48+373720.5 BD* 00 05 17.48 +37 37 20.5           T9 10 0
2 WISE J004945.61+215120.0 BD* 00 49 46.08792 +21 51 20.4300           T8.5 5 0
3 SIMP J013656.5+093347.3 BD* 01 36 56.62488 +09 33 47.3256           T2.0 93 0
4 WISE J014656.66+423410.0 BD* 01 46 56.668 +42 34 10.05           Y0 19 0
5 2MASS J02540788+0223563 BD* 02 54 07.88640 +02 23 56.3460           T8.0 23 0
6 DENIS J025503.3-470049 BD* 02 55 03.6945042584 -47 00 51.345365454     22.921 19.906 17.454 L9 123 0
7 WISEP J031325.96+780744.2 BD* 03 13 25.94352 +78 07 44.3496           T8.5 8 0
8 LP 944-20 LM* 03 39 35.2525168530 -35 25 43.628465433     18.69 16.39 13.288 M9.5Ve 263 0
9 2MASS J03480772-6022270 BD* 03 48 07.72104 -60 22 27.0624           T7 23 0
10 WISE J035000.32-565830.2 BD* 03 50 00.328 -56 58 30.23           Y1 21 0
11 WISE J041022.71+150248.4 BD* 04 10 22.71288 +15 02 48.4620           Y0 30 0
12 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 147 0
13 WISE J045746.08-020719.2 BD* 04 57 46.088 -02 07 19.24           T2 2 0
14 2MASS J05212615+1025328 BD* 05 21 26.157 +10 25 32.88           T7.5 4 0
15 SCR J0533-4257 ** 05 33 28.0350520477 -42 57 20.552265391           M4.5 15 0
16 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1977 1
17 WISE J053516.80-750024.9 BD* 05 35 16.80696 -75 00 24.9156           Y1:+ 16 0
18 2MASS J06073908+2429574 BD* 06 07 39.0222555712 +24 29 56.817873503           L9 13 0
19 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 459 0
20 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A1V+DA 1393 0
21 2MASS J07200325-0846499 LM* 07 20 03.25368 -08 46 49.9044   19.9   16.9 13.80 M9.5+T5 37 0
22 UGPS J072227.51-054031.2 BD* 07 22 27.51096 -05 40 31.2096           T9 62 0
23 2MASS J08173001-6155158 BD* 08 17 29.9988762201 -61 55 15.662376587           T6 23 0
24 WISEA J085510.74-071442.5 BD* 08 55 10.83 -07 14 42.5           Y2 60 0
25 2MASSI J0937347+293142 BD* 09 37 34.87968 +29 31 40.9908           T6 79 0
26 2MASS J09393548-2448279 BD* 09 39 35.48976 -24 48 27.9432           T8 50 0
27 G 161-71 PM* 09 44 54.1925131725 -12 20 54.374177667   15.47 13.646 13.467 10.353 M5.0V 42 0
28 NAME Luhman 16B BD* 10 49 18.9 -53 19 09           T0.5 34 0
29 NAME Luhman 16 ** 10 49 18.915 -53 19 10.08   16.86 16.20   14.95 L7.5+T0.5 72 0
30 NAME Luhman 16A BD* 10 49 19.0 -53 19 10           L7.5 29 0
31 2MASS J11145133-2618235 BD* 11 14 51.33720 -26 18 23.5620           T7.5 34 0
32 WISE J140518.39+553421.3 BD* 14 05 18.39384 +55 34 21.3996           Y0(pec?) 46 0
33 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 194 1
34 2MASS J15031961+2525196 BD* 15 03 19.6105599007 +25 25 19.773297519           T5.5 54 0
35 2MASS J15065257+7027247 BD* 15 06 52.4402578463 +70 27 25.118224880           T6 14 0
36 WISEA J154045.67-510139.3 ** 15 40 43.5369548567 -51 01 35.967538677       15.08   M6.5 10 0
37 WISE J154151.65-225024.9 BD* 15 41 51.65976 -22 50 24.9936           Y0 42 0
38 WISE J163940.83-684738.6 BD* 16 39 40.83 -68 47 38.6           Y0pec 17 0
39 WISEP J174124.25+255319.5 BD* 17 41 24.62064 +25 53 34.3608           T9 21 0
40 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
41 L 43-72 ** 18 11 15.2584 -78 59 23.513   14.27 12.620 12.228 9.49 M4.5 20 0
42 UCAC3 152-281185 PM* 18 45 00.9845244835 -14 09 05.673767306       13.21   M5 10 0
43 SCR J1845-6357B BD? 18 45 05.47 -63 57 46.3           ~ 30 0
44 2MASS J19284155+2356016 BD* 19 28 41.559 +23 56 01.66           T6 7 0
45 2MASS J20304235+0749358 BD* 20 30 42.3329934879 +07 49 35.784998811           T1.5 12 0
46 WISE J205628.91+145953.2 BD* 20 56 28.91952 +14 59 53.2248           Y0 31 0
47 IRAS 21500+5903 PM* 21 51 38.3194245194 +59 17 39.867862225   11.88 10.64     ~ 11 0
48 * eps Ind B BD* 22 04 10.52064 -56 46 57.7452     24.12 20.8 15.60 T1V+T6V 128 2
49 WISE J220905.73+271143.9 BD* 22 09 05.734 +27 11 44.00           Y0: 12 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-06:19:31

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