2004AJ....127.3516G


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET06:28:18

2004AJ....127.3516G - Astron. J., 127, 3516-3536 (2004/June-0)

L' and M' photometry of ultracool dwarfs.

GOLIMOWSKI D.A., LEGGETT S.K., MARLEY M.S., FAN X., GEBALLE T.R., KNAPP G.R., VRBA F.J., HENDEN A.A., LUGINBUHL C.B., GUETTER H.H., MUNN J.A., CANZIAN B., ZHENG W., TSVETANOV Z.I., CHIU K., GLAZEBROOK K., HOVERSTEN E.A., SCHNEIDER D.P. and BRINKMANN J.

Abstract (from CDS):

We have compiled L' (3.4-4.1 µm) and M' (4.6-4.8 µm) photometry of 63 single and binary M, L, and T dwarfs obtained at the United Kingdom Infrared Telescope using the Mauna Kea Observatory filter set. This compilation includes new L' measurements of eight L dwarfs and 13 T dwarfs and new M' measurements of seven L dwarfs, five T dwarfs, and the M1 dwarf Gl 229A. These new data increase by factors of 0.6 and 1.6, respectively, the numbers of ultracool dwarfs (Teff≲2400 K) for which L' and M' measurements have been reported. We compute Lbol, BCK, and Tefffor 42 dwarfs whose flux-calibrated JHK spectra, L' photometry, and trigonometric parallaxes are available, and we estimate these quantities for nine other dwarfs whose parallaxes and flux-calibrated spectra have been obtained. BCKis a well-behaved function of near-infrared spectral type with a dispersion of ∼0.1 mag for types M6-T5; it is significantly more scattered for types T5-T9. Teff declines steeply and monotonically for types M6-L7 and T4-T9, but it is nearly constant at ∼1450 K for types L7-T4 with assumed ages of ∼3 Gyr. This constant Teffis evidenced by nearly unchanging values of L'-M' between types L6 and T3. It also supports recent models that attribute the changing near-infrared luminosities and spectral features across the L-T transition to the rapid migration, disruption, and/or thinning of condensate clouds over a narrow range of Teff. The L' and M' luminosities of early-T dwarfs do not exhibit the pronounced humps or inflections previously noted in the I through K bands, but insufficient data exist for types L6-T5 to assert that M_L'_and M_M'_are strictly monotonic within this range of types. We compare the observed K, L', and M' luminosities of L and T dwarfs in our sample with those predicted by precipitating-cloud and cloud-free models for varying surface gravities and sedimentation efficiencies. The models indicate that the L3-T4.5 dwarfs generally have higher gravities (logg=5.0-5.5) than the T6-T9 dwarfs (logg=4.5-5.0). The predicted M' luminosities of late-T dwarfs are 1.5-2.5 times larger than those derived empirically for the late-T dwarfs in our sample. This discrepancy is attributed to absorption at 4.5-4.9 µm by CO, which is not expected under the condition of thermochemical equilibrium assumed in the models. Our photometry and bolometric calculations indicate that the L3 dwarf Kelu-1 and the T0 dwarf SDSS J042348.57-041403.5 are probable binary systems. We compute log(Lbol/L)=-5.73±0.05 and Teff=600-750 K for the T9 dwarf 2MASSI J0415195-093506, which supplants Gl 570D as the least luminous and coolest brown dwarf presently known.–

Abstract Copyright:

Journal keyword(s): Stars: Fundamental Parameters - Stars: Late-Type - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 77

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Number of rows : 77

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 L 362-29 B BD* 00 04 34.8641153471 -40 44 06.464450691       19.61 16.88 L5+L5 95 0
2 L 362-29 PM* 00 04 36.4374506293 -40 44 02.887752646   14.47 12.84 12.525   M4V 68 0
3 V* DY Psc BY* 00 24 24.6343271916 -01 58 19.968960103     19.42 17.301 15.022 M9.5V 190 1
4 LP 349-25 LM* 00 27 55.98816 +22 19 32.8008   18.6   16.0   M8Ve 62 0
5 2MASS J00325937+1410371 BD* 00 32 59.37576 +14 10 37.1136           L8V 26 0
6 LSPM J0036+1821 BD* 00 36 16.1119130763 +18 21 10.291990145       18.451 16.053 L3.5 188 0
7 2MASS J01075242+0041563 BD* 01 07 52.42200 +00 41 56.3964           L8 47 0
8 BRLT 38 BD* 01 51 41.55936 +12 44 30.0768           T0.5 62 0
9 V* TZ Ari Er* 02 00 12.9561933930 +13 03 07.021294655 15.406 14.100 12.298 10.943 9.195 M4.5V 245 0
10 DENIS J020529.0-115925 BD* 02 05 29.40072 -11 59 29.6736           L7V 139 0
11 2MASS J02074284+0000564 BD* 02 07 42.84984 +00 00 56.4408           T4.5 35 0
12 2MASSI J0243137-245329 BD* 02 43 13.71792 -24 53 29.8356           T6.0 43 0
13 2MASSW J0310599+164816 BD* 03 10 59.86560 +16 48 15.5988           L8V 44 0
14 2MASSI J0328426+230205 BD* 03 28 42.65592 +23 02 05.1900           L9.5 44 0
15 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1604506693 +25 40 23.246972754         17.36 L0V 115 0
16 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 149 0
17 2MASSI J0423485-041403 BD* 04 23 48.5838371891 -04 14 03.228116841           L6.5+T2 107 0
18 2MASS J05395200-0059019 BD* 05 39 52.0036661257 -00 59 01.474175739           L5V 74 0
19 2MASS J05591914-1404488 BD* 05 59 19.1884616785 -14 04 49.215388622           T4.5 134 0
20 HD 42581 Er* 06 10 34.6152510171 -21 51 52.658021185 10.801 9.607 8.125 7.164 6.121 M1V 404 0
21 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 465 0
22 2MASSI J0727182+171001 BD* 07 27 18.24600 +17 10 01.2072           T7.0 75 0
23 LSPM J0746+2000 BD* 07 46 42.49536 +20 00 32.6124       17.9 15.034 L0+L1.5 172 1
24 2MASS J07584037+3247245 BD* 07 58 40.37448 +32 47 24.5544           T0.0+T3.5 34 0
25 2MASS J08053189+4812330 BD* 08 05 31.8466615235 +48 12 32.901300983           L4+T5 32 0
26 2MASSI J0825196+211552 BD* 08 25 19.6171008398 +21 15 51.565129705       21.97 19.22 L7.5V 104 0
27 2MASS J08300825+4828482 BD* 08 30 08.25360 +48 28 48.2880           L9.5 36 0
28 G 252-13 PM* 08 31 30.1191484689 +73 03 45.778502932   14.61   12.5   M4.0Ve 30 0
29 SDSS J083717.21-000018.0 BD* 08 37 17.20032 -00 00 19.3608           T1 42 0
30 2MASS J08503593+1057156 BD* 08 50 35.93400 +10 57 15.6168       22.466 20.349 L6.5+L8.5 69 0
31 LP 666-9 LM* 08 53 36.1607609203 -03 29 32.201339067     18.959 16.781 14.487 M9Ve 226 0
32 2MASS J08575849+5708514 BD* 08 57 58.4811860075 +57 08 51.479710579           L7V 36 0
33 2MASS J09083803+5032088 BD* 09 08 38.0116465550 +50 32 08.217819968           L8 34 0
34 * pi.01 Cnc C BD* 09 12 14.69112 +14 59 39.6240           L8.5+L7.5 51 1
35 2MASSI J0937347+293142 BD* 09 37 34.87968 +29 31 40.9908           T6 80 0
36 2MASS J10210969-0304197 BD* 10 21 09.69240 -03 04 19.7904           T1+T4 67 0
37 2MASSW J1047539+212423 BD* 10 47 53.85456 +21 24 23.4684           T6.5 72 0
38 LP 731-58 Er* 10 48 12.6142482968 -11 20 09.609457904     15.784 16.01 11.25 M6.5V 144 0
39 Wolf 359 Er* 10 56 28.826208 +07 00 52.34400 16.706 15.541 13.507 11.684 9.507 dM6 637 0
40 DENIS J1058.7-1548 BD* 10 58 47.8360754207 -15 48 17.254347029       20.095 17.764 L3V 86 2
41 LP 732-94 LM* 11 21 49.1720839605 -13 13 08.728765179     19.57     M8.5V 123 0
42 Ross 128 Er* 11 47 44.3968668170 +00 48 16.404931305 14.223 12.905 11.153 9.859 8.184 dM4 345 0
43 2MASS J12074717+0244249 BD* 12 07 47.17392 +02 44 24.9288           L6.5+T2.5 53 0
44 2MASS J12171110-0311131 BD* 12 17 11.10288 -03 11 13.1748           T7.5 76 0
45 2MASS J12255432-2739466 BD* 12 25 54.32328 -27 39 46.6776           T5.5+T8 53 0
46 DENIS J122815.2-154733 BD* 12 28 15.23184 -15 47 34.2312       20.187 18.163 L5.5+L5.5 136 0
47 ULAS2MASS J1231+0847 BD* 12 31 47.53608 +08 47 33.1116           T6 28 0
48 Wolf 424 Er* 12 33 17.361480 +09 01 15.79224 15.398 14.313 12.467 10.937 8.988 M5.5V 301 0
49 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 134 0
50 NAME Kelu-1 BD* 13 05 40.1737206066 -25 41 05.830344467         16.85 L2+L3.5 238 0
51 2MASS J13262981-0038314 BD* 13 26 29.81880 -00 38 31.4880           L5.5V 36 0
52 2MASS J13464634-0031501 BD* 13 46 46.34496 -00 31 50.1312           T6 69 0
53 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 198 0
54 LP 271-25 LM* 14 28 43.2272685950 +33 10 39.245755294   21.2   17.8   M9Ve 233 0
55 2MASS J14392836+1929149 BD* 14 39 28.36896 +19 29 14.9820           L1V 117 0
56 LP 326-21 LM* 14 44 17.1771407075 +30 02 14.222321649   20.0   17.8   M8e 20 0
57 2MASS J14460061+0024519 BD* 14 46 00.61560 +00 24 51.9660           L5V 30 0
58 LP 914-54 Er* 14 56 38.2643948965 -28 09 48.622430247     17.141 14.863 12.433 M7.0Ve 137 0
59 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 196 1
60 TVLM 513-46 LM* 15 01 08.1871800643 +22 50 02.120480463   21.4 15.09 18.0   M8.5V 148 0
61 2MASS J15031961+2525196 BD* 15 03 19.6105599007 +25 25 19.773297519           T5.5 55 0
62 2MASSW J1507476-162738 BD* 15 07 47.6756748763 -16 27 40.118410414     22.136 18.928 16.579 L5V 172 0
63 * eta CrB C BD* 15 23 22.63488 +30 14 56.2092           L8V 98 1
64 2MASSI J1534498-295227 BD* 15 34 49.84080 -29 52 27.4188           T4.5+T5 59 0
65 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 131 0
66 2MASS J16322911+1904407 BD* 16 32 29.11416 +19 04 40.7136       22.42 19.98 L8V 119 0
67 Wolf 629 PM* 16 55 25.2215746210 -08 19 21.301127712 14.691 13.436 11.759 10.574 9.044 M3.5V 194 0
68 2MASS J17503293+1759042 BD* 17 50 32.93832 +17 59 04.2504           T3.5 46 0
69 HD 180617 Ro* 19 16 55.2565250393 +05 10 08.038856129 11.768 10.63 9.115 8.076 6.782 M3-V 356 0
70 SDSS J204749.59-071818.2 BD* 20 47 49.59816 -07 18 18.2592           L9.5 15 0
71 Wolf 896 PM* 20 56 46.5970399407 -10 26 54.749213101 14.112 12.999 11.487 10.428 9.106 dM2.5 84 0
72 2MASSW J2224438-015852 BD* 22 24 43.8550503291 -01 58 53.265872547           L4.5V 107 0
73 2MASS J22443167+2043433 BD* 22 44 31.67376 +20 43 43.3020           L6-L8gamma 74 0
74 2MASS J22495345+0044046 BD* 22 49 53.45592 +00 44 04.6608           L3+L5 40 0
75 2MASSI J2254188+312349 BD* 22 54 18.92016 +31 23 49.8300           T5.0 58 0
76 2MASS J22552907-0034336 LM* 22 55 29.0850402031 -00 34 33.682922600     20.26     M8.6V 26 1
77 2MASSI J2356547-155310 BD* 23 56 54.77040 -15 53 11.1336           T5.8 39 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-06:28:18

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