2014A&A...566A.111W


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST06:49:04

2014A&A...566A.111W - Astronomy and Astrophysics, volume 566A, 111-111 (2014/6-1)

The brown dwarf atmosphere monitoring (BAM) project. I. The largest near-IR monitoring survey of L and T dwarfs.

WILSON P.A., RAJAN A. and PATIENCE J.

Abstract (from CDS):

Using the SofI instrument on the 3.5m New Technology Telescope, we have conducted an extensive near-infrared monitoring survey of an unbiased sample of 69 brown dwarfs spanning the L0 to T8 spectral range, with at least one example of each spectral type. Each target was observed for a 2-4h period in the Js-band, and the median photometric precision of the data is ∼0.7%. A total of 14 brown dwarfs were identified as variables with min-to-max amplitudes ranging from 1.7% to 10.8% over the observed duration. All variables satisfy a statistical significance threshold with a p-value ≤5% based on comparison with a median reference star light curve. Approximately half of the variables show pure sinusoidal amplitude variations similar to 2MASSJ2139+0220, and the remainder show multi-component variability in their light curves similar to SIMPJ0136+0933. It has been suggested that the L-T transition should be a region of a higher degree of variability if patchy clouds are present, and this survey was designed to test the patchy cloud model with photometric monitoring of both the L-T transition and non-transition brown dwarfs. The measured frequency of variables is 13+10–4% across the L7-T4 spectral range, indistinguishable from the frequency of variables of the earlier spectral types (30+11–8%), the later spectral types (13+10–4%), or the combination of all non-transition region brown dwarfs (22+7–5%). The variables are not concentrated in the transition, in a specific colour, or in binary systems. Of the brown dwarfs previously monitored for variability, only ∼60% maintained the state of variability (variable or constant), with the remaining switching states. The 14 variables include 9 newly identified variables that will provide important systems for follow-up multi-wavelength monitoring to further investigate brown dwarf atmosphere physics.

Abstract Copyright:

Journal keyword(s): techniques: photometric - brown dwarfs - stars: low-mass - stars: atmospheres

VizieR on-line data: <Available at CDS (J/A+A/566/A111): table3.dat lcs.dat>

Simbad objects: 73

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Number of rows : 73

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 2MASS J00165953-4056541 BD* 00 16 59.5385247354 -40 56 53.921713920           L5.5 11 0
2 2MASS J00184613-6356122 BD* 00 18 46.0818192889 -63 56 11.814891108           L2 5 0
3 2MASS J00345157+0523050 BD* 00 34 51.57696 +05 23 05.0964           T6.5 24 0
4 2MASS J00501994-3322402 BD* 00 50 19.94352 -33 22 40.2708           T7 31 0
5 2MASS J01062285-5933185 BD* 01 06 22.8516710951 -59 33 18.458104595           L0 7 0
6 SIPS J0128-5545 BD* 01 28 26.6440088291 -55 45 34.241303192         17.067 L1 15 0
7 SIMP J013656.5+093347.3 BD* 01 36 56.62488 +09 33 47.3256           T2.0 93 0
8 DENIS J020529.0-115925 BD* 02 05 29.40072 -11 59 29.6736           L7V 137 0
9 2MASS J02284355-6325052 BD* 02 28 43.4707636597 -63 25 05.595861000       20.12 16.72 L0.5 8 0
10 2MASS J02572581-3105523 BD* 02 57 25.8363951445 -31 05 52.190452115           L8.5 24 0
11 2MASSI J0318540-342129 BD* 03 18 54.03672 -34 21 29.2176           L7 22 0
12 2MASSI J0340094-672405 BD* 03 40 09.3536550966 -67 24 04.404594918           L7:: 7 0
13 2MASS J03480772-6022270 BD* 03 48 07.72104 -60 22 27.0624           T7 23 0
14 2MASS J03582255-4116060 BD* 03 58 22.55064 -41 16 06.0420           L6pec 13 0
15 2MASS J04070752+1546457 BD* 04 07 07.5265995904 +15 46 45.539968899           L3 13 0
16 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 147 0
17 2MASSI J0423485-041403 BD* 04 23 48.5838371891 -04 14 03.228116841           L6.5+T2 105 0
18 2MASS J04390101-2353083 BD* 04 39 01.0052846057 -23 53 08.491292431           L4.5 34 0
19 2MASS J04455387-3048204 BD* 04 45 53.8963304655 -30 48 20.638907091           L2 22 0
20 2MASS J05103524-4208146 BD* 05 10 35.24352 -42 08 14.6580           T5 11 1
21 2MASS J05160945-0445499 BD* 05 16 09.45840 -04 45 49.9392           T5.5 20 0
22 2MASS J05233822-1403022 BD* 05 23 38.2238597336 -14 03 02.008934344           L2.5 51 0
23 2MASS J05591914-1404488 BD* 05 59 19.1884616785 -14 04 49.215388622           T4.5 133 0
24 2MASS J06244595-4521548 BD* 06 24 45.9446291159 -45 21 54.729100254         18.32 L6.5 28 0
25 2MASS J07290002-3954043 BD* 07 29 00.02496 -39 54 04.3992           T8pec 24 0
26 2MASS J08173001-6155158 BD* 08 17 29.9988762201 -61 55 15.662376587           T6 23 0
27 2MASS J08354256-0819237 BD* 08 35 42.5323299335 -08 19 23.389468248           L6.5 55 0
28 2MASS J09153413+0422045 BD* 09 15 34.13712 +04 22 04.5948           L6 29 0
29 2MASS J09310955+0327331 BD* 09 31 09.55248 +03 27 33.1272           L7.5 10 0
30 2MASS J09393548-2448279 BD* 09 39 35.48976 -24 48 27.9432           T8 50 0
31 2MASS J09490860-1545485 BD* 09 49 08.60280 -15 45 48.5244           T1.0+T2.0 17 0
32 2MASSW J1004392-333518 BD* 10 04 39.3210622158 -33 35 19.112763324           L5 13 0
33 2MASS J10073369-4555147 BD* 10 07 33.69888 -45 55 14.7108           T5 14 0
34 2MASS J10101480-0406499 BD* 10 10 14.80704 -04 06 49.9320           L6 44 0
35 2MASS J10210969-0304197 BD* 10 21 09.69240 -03 04 19.7904           T1+T4 67 0
36 2MASS J10521350+4422559 BD* 10 52 13.50504 +44 22 55.9128           L6.5+T1.5 26 0
37 2MASS J11145133-2618235 BD* 11 14 51.33720 -26 18 23.5620           T7.5 34 0
38 DENIS J112639.9-500355 BD* 11 26 39.8035292578 -50 03 54.849546892         17.800 L5.5 35 0
39 2MASS J11555389+0559577 BD* 11 55 53.89032 +05 59 57.7032           L7.5 23 0
40 TWA 27 LM* 12 07 33.4676156527 -39 32 54.016042897     19.95 17.99 15.88 M8IVe 310 0
41 2MASS J12074717+0244249 BD* 12 07 47.17392 +02 44 24.9288           L6.5+T2.5 52 0
42 2MASS J12171110-0311131 BD* 12 17 11.10288 -03 11 13.1748           T7.5 76 0
43 2MASS J12255432-2739466 BD* 12 25 54.32328 -27 39 46.6776           T5.5+T8 52 0
44 DENIS J122815.2-154733 BD* 12 28 15.23184 -15 47 34.2312       20.187 18.163 L5.5+L5.5 134 0
45 ULAS2MASS J1231+0847 BD* 12 31 47.53608 +08 47 33.1116           T6 28 0
46 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 133 0
47 2MASSI J1300425+191235 BD* 13 00 42.5078338130 +19 12 34.600170519         15.9 L1.7V 46 0
48 2MASS J13262981-0038314 BD* 13 26 29.81880 -00 38 31.4880           L5.5V 36 0
49 2MASS J14044948-3159330 BD* 14 04 49.48416 -31 59 33.0576           T1+T5 29 1
50 2MASSW J1507476-162738 BD* 15 07 47.6756748763 -16 27 40.118410414     22.136 18.928 16.579 L5V 169 0
51 SDSS J151114.65+060742.9 BD* 15 11 14.66280 +06 07 43.1652           T2.0 30 0
52 2MASS J15210327+0131426 BD* 15 21 03.27096 +01 31 42.6900           T3.0 16 0
53 2MASSI J1534498-295227 BD* 15 34 49.84080 -29 52 27.4188           T4.5+T5 58 0
54 2MASSI J1546271-332511 BD* 15 46 27.18600 -33 25 11.1828           T5.7 28 1
55 2MASS J15530228+1532369 BD* 15 53 02.28072 +15 32 36.9132           T6.5+T7.5 40 0
56 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 131 0
57 2MASS J16322911+1904407 BD* 16 32 29.11416 +19 04 40.7136       22.42 19.98 L8V 117 0
58 2MASS J18283572-4849046 BD* 18 28 35.72256 -48 49 04.6380           T6 21 0
59 2MASS J19360187-5502322 BD* 19 36 01.8919176353 -55 02 32.147764833           L4 14 0
60 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1082 1
61 2MASS J20431769-1551031 BD* 20 43 17.69112 -15 51 03.1644           L9.5 10 0
62 SDSS J204749.59-071818.2 BD* 20 47 49.59816 -07 18 18.2592           L9.5 15 0
63 2MASS J20523515-1609308 PM* 20 52 35.158 -16 09 30.84           ~ 2 0
64 CFBDS J213926+022023 BD* 21 39 26.76936 +02 20 22.6968           L8.5+T3.5 66 0
65 2MASS J21513839-4853542 BD* 21 51 38.39304 -48 53 54.2508           T4.5 17 0
66 2MASS J22282889-4310262 BD* 22 28 28.89432 -43 10 26.2740           T6.5 55 0
67 2MASS J22521073-1730134 BD* 22 52 10.7502089068 -17 30 13.928785116         17.9 L4.5+T3.5 42 0
68 SIPS J2255-5713 BD* 22 55 18.6002963228 -57 13 06.264206714       20.58   L6:+L8 14 0
69 HD 218396b Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 199 1
70 SDSS J232123.76+135458.8 BD* 23 21 23.79912 +13 54 54.9180           T7.5 10 0
71 2MASS J23224684-3133231 BD* 23 22 46.8276915604 -31 33 23.488659629         16.841 L1.6:V 18 0
72 2MASS J23312378-4718274 BD* 23 31 23.78712 -47 18 27.4356           T5 19 0
73 2MASSI J2356547-155310 BD* 23 56 54.77040 -15 53 11.1336           T5.8 39 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-06:49:04

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