2011A&A...529A..44W


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST01:31:19

2011A&A...529A..44W - Astronomy and Astrophysics, volume 529A, 44-44 (2011/5-1)

Dust in brown dwarfs and extra-solar planets. III. Testing synthetic spectra on observations.

WITTE S., HELLING C., BARMAN T., HEIDRICH N. and HAUSCHILDT P.H.

Abstract (from CDS):

This work is concerned with dust formation in ultra-cool atmospheres, encompassing the latest type stars, brown dwarfs, and hot giant exoplanets. Dust represents one of the most important and yet least understood sources of opacity in these types of objects. We compare our model spectra with SpeX data in order to draw conclusions about the dust cloud structure and related quantities in ultra-cool atmospheres. We use the self-consistent Drift-Phoenix atmosphere code, which features a kinetic dust formation mechanism and accounts for the dust cloud influence on the spectra. We present fits of our latest model spectra to observations that cover a wide range of our model grid. The results are remarkably good, yielding significant improvement over the older C ond-/Dusty-Phoenix models, especially in the L-dwarf regime. The new models are able to properly reproduce observed spectra, including complicated features such as the molecular band strengths. This raises confidence in the reliability of our dust-modeling approach. We demonstrate that our code produces excellent results concerning the fitting with observations. This suggests that our dust cloud and atmosphere structures are reasonably accurate. Like all other current cloud models, ours is not able to produce satisfying results for spectral types later than L6 without manually tuning down the amount of dust. Our results show the formation of convective cells within the cloud, which are able to destroy the lower cloud parts. The dust opacity is reduced significantly without the need to tune the dust cloud thickness. There are indications that the cycle of dust accumulation and cloud destruction by convection is time-dependent on rather long timescales. Considering a statistical distribution of locally variable dust clouds over a dwarf's surface can result in a large number of spectral configurations for the same model atmosphere parameters, hence introducing an additional and more or less random degree of freedom to those atmospheres. Without resorting to the model atmosphere parameters, this alone can account for the unusually red and blue objects that have been discovered.

Abstract Copyright:

Journal keyword(s): astrochemistry - methods: numerical - stars: atmospheres - stars: low-mass - brown dwarfs

Simbad objects: 97

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Number of rows : 97

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 J00013044+1010146 LM* 00 01 30.4544146175 +10 10 14.812608851           M6V 4 0
2 2MASS J00025097+2454141 BD* 00 02 50.97576 +24 54 14.1696           L5.5 5 0
3 L 362-29 B BD* 00 04 34.8641153471 -40 44 06.464450691       19.61 16.88 L5+L5 94 0
4 2MASS J00115060-1523450 LM* 00 11 50.6125880311 -15 23 45.290441697           M7.5Ve 4 0
5 2MASS J00335534-0908247 LM* 00 33 55.3649773990 -09 08 24.691761194           M8Ve: 4 0
6 LSPM J0036+1821 BD* 00 36 16.1119130763 +18 21 10.291990145       18.451 16.053 L3.5 185 0
7 2MASS J00552554+4130184 LM* 00 55 25.5438276241 +41 30 18.438286204           M8Ve: 6 0
8 2MASS J00583814-1747311 LM* 00 58 38.1360760552 -17 47 30.975730757           M6V 3 0
9 2MASSI J0103320+193536 BD* 01 03 32.03712 +19 35 36.1824           L6V 64 0
10 2MASS J01174748-3403258 BD* 01 17 47.4932550807 -34 03 25.819621153       21.040 18.825 L1gamma 23 0
11 2MASS J01415823-4633574 BD* 01 41 58.2345784233 -46 33 57.347491326           L0gamma 62 0
12 2MASS J01443536-0716142 BD* 01 44 35.4046436342 -07 16 14.314061744           L6.5 42 0
13 2MASS J01470204+2120242 LM* 01 47 02.0493390861 +21 20 24.181798789           M7.5Ve: 3 0
14 2MASS J01532750+3631482 LM* 01 53 27.4996604422 +36 31 48.291476327           M6V 4 0
15 2MASS J02060880+2235593 BD* 02 06 08.80008 +22 35 59.3340           L4.5 9 0
16 2MASSW J0208183+254253 BD* 02 08 18.3848853893 +25 42 53.188899852           L1V 35 0
17 2MASS J02271036-1624479 BD* 02 27 10.3326982645 -16 24 47.652221982         16.846 L1.5 22 0
18 2MASSI J0228110+253738 BD* 02 28 11.01312 +25 37 38.0136           L0 19 0
19 2MASS J02355993-2331205 BD* 02 35 59.9393683632 -23 31 20.398833102           L1.5 35 0
20 2MASS J02415367-1241069 BD* 02 41 53.7160633104 -12 41 07.099850483           L2.5 11 0
21 2MASS J02425693+2123204 BD* 02 42 56.93928 +21 23 20.4288           L4 4 0
22 NAME Teegarden's Star LM* 02 53 00.8913291021 +16 52 52.642086267   17.21   14.1   M7.0V 106 0
23 2MASS J03202839-0446358 LM* 03 20 28.3595736792 -04 46 36.418652525           M8.5+T5 39 0
24 LP 944-20 LM* 03 39 35.2525168530 -35 25 43.628465433     18.69 16.39 13.288 M9.5Ve 263 0
25 [BNM2013] 32.03 1131 TT* 03 44 21.1526797359 +32 06 16.605984210         18.207 ~ 27 0
26 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1604506693 +25 40 23.246972754         17.36 L0V 114 0
27 2MASS J04035944+1520502 LM* 04 03 59.4321793079 +15 20 50.584752923           M7V 2 0
28 2MASS J04390101-2353083 BD* 04 39 01.0052846057 -23 53 08.491292431           L4.5 34 0
29 2MASS J04414825+2534304 BD* 04 41 48.2522895943 +25 34 30.569106360         17.03 M8e 47 0
30 2MASS J04574903+3015195 Y*O 04 57 49.0192539270 +30 15 19.142767817           M9 24 0
31 V* V2384 Ori Al* 05 35 21.8463185314 -05 46 08.560286991       19.21 17.28 M7 87 1
32 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 459 0
33 2MASS J06540564+6528051 BD* 06 54 05.64120 +65 28 05.1672           L5.5 8 0
34 2MASSI J0727182+171001 BD* 07 27 18.24600 +17 10 01.2072           T7.0 75 0
35 SSSPM J0829-1309 BD* 08 28 34.1713208171 -13 09 19.842042734         16.07 L2 40 0
36 2MASS J08350622+1953050 BD* 08 35 06.22944 +19 53 05.0532           L5 27 0
37 2MASS J08472872-1532372 BD* 08 47 28.7416835853 -15 32 37.377187745           L1.5 27 0
38 2MASS J08511627+1817302 BD* 08 51 16.27584 +18 17 30.2316           L6 8 0
39 2MASS J09211410-2104446 BD* 09 21 14.1078049422 -21 04 44.422366157         16.50 L1 36 0
40 2MASS J10101480-0406499 BD* 10 10 14.80704 -04 06 49.9320           L6 44 0
41 2MASS J10221489+4114266 BD* 10 22 14.8730865157 +41 14 26.509644568           L0.5 39 0
42 2MASS J10332186+4005499 BD* 10 33 21.86712 +40 05 49.9272           L6 9 0
43 LSPM J1048+0111 BD* 10 48 42.8148643194 +01 11 58.221459212       19.4   L1 39 0
44 2MASS J11000965+4957470 BD* 11 00 09.6416956715 +49 57 46.781793983           L3 13 0
45 2MASS J11040127+1959217 BD* 11 04 01.2776694317 +19 59 21.706894439           L4 30 0
46 2MASS J11150577+2520467 LM* 11 15 05.7661489528 +25 20 46.931156472           M7.5Ve: 3 0
47 2MUCD 10984 LM* 11 24 04.8866929847 +38 08 05.428778736         16.12 M8.5V 17 0
48 2MASS J11323833-1446374 LM* 11 32 38.3560350217 -14 46 36.669945037           M7V 2 0
49 TWA 26 LM* 11 39 51.1435262748 -31 59 21.473337261         15.83 M8e 96 0
50 2MASS J12070374-3151298 BD* 12 07 03.74352 -31 51 29.8980           L2 8 0
51 2MASS J12121714-2253451 LM* 12 12 17.1349120729 -22 53 45.243997213           M8Ve 3 0
52 2MASS J12165918+3003054 BD* 12 16 59.18568 +30 03 05.4684           L4 4 0
53 2MASS J12212770+0257198 BD* 12 21 27.7131144739 +02 57 19.771565458           L0.5 27 0
54 2MASS J12304562+2827583 BD* 12 30 45.6308887272 +28 27 58.158914832           L2 8 0
55 TWA 29 LM* 12 45 14.1609543807 -44 29 07.737190128         18.0 M9.5p 42 0
56 2MASS J12531161+2728145 LM* 12 53 11.6161810598 +27 28 14.671054820           M9 4 0
57 NAME Kelu-1 BD* 13 05 40.1737206066 -25 41 05.830344467         16.85 L2+L3.5 236 0
58 2MASS J13420311+1340222 BD* 13 42 03.11088 +13 40 22.2960           L6 9 0
59 2MASS J13452562+5216337 BD* 13 45 25.62 +52 16 33.8           L3 4 0
60 2MASS J14171672-0407311 LM* 14 17 16.7140992737 -04 07 31.000635048           M8Ve: 3 0
61 LP 271-25 LM* 14 28 43.2272685950 +33 10 39.245755294   21.2   17.8   M9Ve 233 0
62 2MASS J14313097+1436539 BD* 14 31 30.9277595670 +14 36 53.784668276           L1 11 0
63 2MASS J14392836+1929149 BD* 14 39 28.36896 +19 29 14.9820           L1V 116 0
64 2MASSW J1506544+132106 BD* 15 06 54.3298685056 +13 21 06.041740524           L3 82 0
65 2MASSW J1507476-162738 BD* 15 07 47.6756748763 -16 27 40.118410414     22.136 18.928 16.579 L5V 169 0
66 2MASS J15200224-4422419 ** 15 20 02.24160 -44 22 41.9880       19.4 16.89 L1.5+L4.5 21 0
67 2MASS J15243203+0934386 LM* 15 24 32.0385586766 +09 34 38.580324501           M7Ve: 4 0
68 2MASS J15345325+1219495 BD* 15 34 53.2643898317 +12 19 49.405448041           L3 8 0
69 2MASS J15484912+1722359 BD* 15 48 49.12704 +17 22 35.9724           L4.5 10 0
70 2MASS J16173168+4019003 BD* 16 17 31.68864 +40 19 00.3684           L6.5 5 0
71 2MASS J16225533+1159238 BD* 16 22 55.33584 +11 59 23.8920           L4.5 6 0
72 2MASS J16335933-0640552 BD* 16 33 59.33184 -06 40 55.2396           L5.5 10 0
73 2MASS J16452211-1319516 BD* 16 45 22.0919780729 -13 19 52.262593548           L1.5 32 0
74 SDSS J164916.89+464340.0 BD* 16 49 16.89 +46 43 40.0           L4.5 3 0
75 VB 8 Fl* 16 55 35.2561420232 -08 23 40.752903617   18.7 16.916 14.566 12.24 M7Ve 381 0
76 2MASS J17072343-0558249 ** 17 07 23.43528 -05 58 24.9204       18.9 15.38 M9+L3 25 0
77 2MASSI J1711135+232633 BD* 17 11 13.5213810515 +23 26 33.241020307           L0e 15 0
78 2MASS J17310140+5310476 BD* 17 31 01.40784 +53 10 47.6148           L5 7 0
79 2MASS J17364839+0220426 LM* 17 36 48.4029529463 +02 20 42.602021418           M8V 5 0
80 2MASS J18071593+5015316 BD* 18 07 15.9376984448 +50 15 31.634072578           L1 35 0
81 2MASS J18244344+2937133 LM* 18 24 43.4432823063 +29 37 13.483770257           M6V 3 0
82 VB 10 Er* 19 16 57.6103282334 +05 09 01.588675251     17.30     M8V 435 1
83 2MASSI J2002507-052152 BD* 20 02 50.7114995555 -05 21 52.582497214           L5.5 22 0
84 2MASS J20282035+0052265 BD* 20 28 20.3586416021 +00 52 26.511094674           L2.5 29 0
85 2MASS J20491972-1944324 LM* 20 49 19.7504077509 -19 44 32.753874899       17.850 15.449 M7.5e 18 0
86 2MASS J20575409-0252302 BD* 20 57 54.0935087240 -02 52 30.249848091           L1 50 0
87 2MASSW J2101154+175658 BD* 21 01 15.44112 +17 56 58.6860           L7+L8 25 0
88 2MASS J21073169-0307337 BD* 21 07 31.6899288985 -03 07 33.654685090           L0 12 0
89 2MASS J21324036+1029494 BD* 21 32 40.36104 +10 29 49.4808           L5.5 9 0
90 2MASS J21335274+1018410 BD* 21 33 52.74144 +10 18 41.0184           L3.5 4 0
91 2MASSW J2148162+400359 BD* 21 48 16.2971270771 +40 03 59.335322406           L7 48 0
92 2MASSI J2151254-244100 BD* 21 51 25.43136 -24 41 00.0600       21.831 19.252 L3 15 0
93 2MASS J22443167+2043433 BD* 22 44 31.67376 +20 43 43.3020           L6-L8gamma 73 0
94 2MASS J22495345+0044046 BD* 22 49 53.45592 +00 44 04.6608           L3+L5 39 0
95 2MASS J23280459-1038452 BD* 23 28 04.59576 -10 38 45.2472           L2 7 0
96 SSSPM J2352-2538 LM* 23 51 50.4655324606 -25 37 36.839115132           M9e 32 0
97 APMPM J2354-3316C LM* 23 54 09.2805127466 -33 16 26.756659790         16.00 M8.5Ve 18 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-01:31:19

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