2008ApJ...681..579B

Query : 2008ApJ...681..579B

2008ApJ...681..579B - Astrophys. J., 681, 579-593 (2008/July-1)

Subtle signatures of multiplicity in late-type dwarf spectra: the unresolved M8.5 + T5 binary 2MASS J03202839-0446358.

BURGASSER A.J., LIU M.C., IRELAND M.J., CRUZ K.L. and DUPUY T.J.

Abstract (from CDS):

Evidence is presented that 2MASS J03202839-0446358, a late-type dwarf with discrepant optical (M8:) and near-infrared (L1) spectral types, is an as-yet unresolved stellar/brown dwarf binary with late-type M dwarf and T dwarf components. This conclusion is based on low-resolution, near-infrared spectroscopy that reveals a subtle but distinctive absorption feature at 1.6 µm. The feature, which is also present in the combined light spectrum of the M8.5 + T6 binary SCR 1845-6357, arises from the combination of FeH absorption from an M8.5 primary and pseudocontinuum flux from a T5±1 secondary, as ascertained from binary spectral templates constructed from empirical data. The binary templates provide a far superior match to the overall near-infrared spectral energy distribution of 2MASS J0320-0446 than any single comparison spectra. Laser guide star adaptive optics (LGS AO) imaging observations, including the first application of LGS AO aperture mask interferometry, fail to resolve a faint companion, restricting the projected separation of the system to less than 8.3 AU at the time of observation. 2MASS J0320-0446 is the second very low mass binary to be identified from unresolved, low-resolution, near-infrared spectroscopy, a technique that complements traditional high-resolution imaging and spectroscopic methods.

Abstract Copyright: ∼

Journal keyword(s): Stars: Binaries: General - Stars: Fundamental Parameters - Stars: Individual - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 109

goto Full paper

goto View the references in ADS

Number of rows : 109
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 2MASS J00345157+0523050 BD* 00 34 51.57696 +05 23 05.0964           T6.5 41 0
2 LSPM J0036+1821 BD* 00 36 16.1118891182 +18 21 10.286665966       18.451 16.053 L3.5 230 0
3 * 54 Psc B BD* 00 39 18.9174 +21 15 16.309           T7.5 86 1
4 2MASS J00501994-3322402 BD* 00 50 19.94352 -33 22 40.2708           T7 45 0
5 2MASSI J0103320+193536 BD* 01 03 32.03712 +19 35 36.1824           L6V 93 0
6 2MASS J01174748-3403258 BD* 01 17 47.4931545768 -34 03 25.849109412       21.040 18.825 L1gamma 36 0
7 SIMP J013656.5+093347.3 BD* 01 36 56.5605419830 +09 33 47.311965969           T2.0 167 0
8 2MASS J01443536-0716142 BD* 01 44 35.4064614144 -07 16 14.318758700           L6.5 63 0
9 BRLT 38 BD* 01 51 41.55936 +12 44 30.0768           T0.5 74 0
10 2MASSW J0205034+125142 BD* 02 05 03.44232 +12 51 42.2316           L5V 37 0
11 2MASS J02074284+0000564 BD* 02 07 42.84984 +00 00 56.4408           T4.5 46 0
12 2MASS J02081833+2542533 BD* 02 08 18.3864053730 +25 42 53.199852759           L1V 53 0
13 SIPS J0227-1624 BD* 02 27 10.3319565862 -16 24 47.668301470         16.846 L1.5 33 0
14 2MASSI J0228110+253738 BD* 02 28 11.01312 +25 37 38.0136           L0 28 0
15 HD 16270B BD* 02 35 59.9394221640 -23 31 20.410151736           L1.5 49 0
16 2MASS J02415367-1241069 BD* 02 41 53.7110817850 -12 41 07.161725942           L2.5 15 0
17 2MASS J02431371-2453298 BD* 02 43 13.71792 -24 53 29.8356           T6.0 55 0
18 NAME Teegarden's Star LM* 02 53 00.8917932409 +16 52 52.632190137   17.21 15.14 13.03 10.65 dM6 207 0
19 DENIS J025503.3-470049 BD* 02 55 03.6927058871 -47 00 51.356903955     22.921 19.906 17.454 L9 170 0
20 HD 18571 * 02 59 16.7596506264 +01 14 40.474198968   8.66 8.63     A0V 44 0
21 2MASSW J0310599+164816 BD* 03 10 59.86560 +16 48 15.5988           L8V 57 0
22 USNO-B1.0 0852-00031783 * 03 20 27.9735879696 -04 46 24.043364400           ~ 2 0
23 2MASS J03202839-0446358 BD* 03 20 28.3630482681 -04 46 36.396685568           M8.5+T5 49 0
24 2MASSI J0328426+230205 BD* 03 28 42.65592 +23 02 05.1900           L9.5 50 0
25 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 308 0
26 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1616128256 +25 40 23.239779672         17.36 L0V 136 0
27 2MASS J04070885+1514565 BD* 04 07 08.85480 +15 14 56.5980           T5.5 24 0
28 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 182 0
29 2MASS J04390101-2353083 BD* 04 39 01.0048450008 -23 53 08.495187288           L4.5 50 0
30 2MASS J05103524-4208146 BD* 05 10 35.24352 -42 08 14.6580           T5 14 1
31 2MASS J05160945-0445499 BD* 05 16 09.45840 -04 45 49.9392           T5.5 29 0
32 2MASS J05591914-1404488 BD* 05 59 19.1872549354 -14 04 49.206913185           T4.5 159 0
33 2MASS J06020638+4043588 BD* 06 02 06.38496 +40 43 58.8900           T4.5 18 0
34 2MASSI J0727182+171001 BD* 07 27 18.24600 +17 10 01.2072           T7.0 104 0
35 2MASS J07290002-3954043 BD* 07 29 00.02496 -39 54 04.3992           T8pec 36 0
36 2MASSI J0755480+221218 BD* 07 55 47.95488 +22 12 16.9416           T5.2 37 0
37 2MASS J08053189+4812330 BD* 08 05 31.8496436040 +48 12 33.131831320           L4+T5 51 0
38 SSSPM J0829-1309 BD* 08 28 34.1716399433 -13 09 19.841445886         16.07 L2 59 0
39 2MASS J08300825+4828482 BD* 08 30 08.1496038211 +48 28 47.538657498           L9.5 53 0
40 SIPS J0847-1532 BD* 08 47 28.7413750872 -15 32 37.370330484           L1.5 44 0
41 2MASS J09393548-2448279 BD* 09 39 35.48976 -24 48 27.9432           T8 69 0
42 2MASS J09490860-1545485 BD* 09 49 08.60280 -15 45 48.5244           T1.0+T2.0 26 0
43 2MASS J10073369-4555147 BD* 10 07 33.69888 -45 55 14.7108           T5 17 0
44 2MASSI J1010148-040649 BD* 10 10 14.80704 -04 06 49.9320           L6 73 0
45 HD 89744B BD* 10 22 14.8720836024 +41 14 26.514370356           L0.5 50 0
46 2MASSW J1047539+212423 BD* 10 47 53.85456 +21 24 23.4684           T6.5 98 0
47 LSPM J1048+0111 BD* 10 48 42.8144208091 +01 11 58.221081965       19.4   L1 64 0
48 2MASS J10521350+4422559 BD* 10 52 13.50504 +44 22 55.9128           L6.5+T1.5 38 0
49 Wolf 359 PM* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 775 0
50 2MASS J11040127+1959217 BD* 11 04 01.2774943824 +19 59 21.714139176           L4 50 0
51 2MASSI J1106119+275422 BD* 11 06 11.9261120247 +27 54 21.827590955           T0.0+T4.5 37 1
52 2MASS J11101001+0116130 BD* 11 10 10.01064 +01 16 13.0872           T5.5 86 0
53 2MASS J11145133-2618235 BD* 11 14 51.33720 -26 18 23.5620           T7.5 50 0
54 2MASS J11220826-3512363 BD* 11 22 08.2584613608 -35 12 36.580608360           T2.0 28 0
55 RX J1124.1+3808B LM* 11 24 04.8863943864 +38 08 05.432794728         16.12 M8.5V 25 0
56 SDSS J120747.17+024424.8 BD* 12 07 47.17392 +02 44 24.9288           L6.5+T2.5 73 0
57 2MASS J12095613-1004008 BD* 12 09 56.13096 -10 04 00.8076           T2+T7.5 67 0
58 2MASS J12144089+6316434 BD* 12 14 40.89984 +63 16 43.4352           T3.5 18 0
59 2MASS J12171110-0311131 BD* 12 17 11.10288 -03 11 13.1748           T7.5 92 0
60 2MASS J12212770+0257198 BD* 12 21 27.7124211648 +02 57 19.767907440           L0.5 51 0
61 ULAS2MASS J1231+0847 BD* 12 31 47.53608 +08 47 33.1116           T6 37 0
62 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 167 0
63 NAME Kelu-1 BD* 13 05 40.1642434199 -25 41 05.712165150         16.85 L2+L3.5 267 0
64 2MASS J13243553+6358281 BD* 13 24 35.53752 +63 58 28.1532           L8.0+T3.5 61 1
65 2MASS J13464634-0031501 BD* 13 46 46.34496 -00 31 50.1312           T6 86 0
66 2MASS J14044948-3159330 BD* 14 04 49.48416 -31 59 33.0576           T1+T5 35 1
67 LP 271-25 LM* 14 28 43.2275214164 +33 10 39.259309081   21.2   17.8   M9Ve 262 0
68 2MASS J14392836+1929149 BD* 14 39 28.1499428599 +19 29 15.908790370           L1V 145 0
69 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 242 1
70 2MASS J15031961+2525196 BD* 15 03 19.6109033841 +25 25 19.795679019           T5.5 84 0
71 2MASSW J1506544+132106 BD* 15 06 54.3299045806 +13 21 06.039351151           L3 116 0
72 2MASSW J1507476-162738 BD* 15 07 47.6758255542 -16 27 40.113982846     22.136 18.928 16.579 L5V 216 0
73 2MASSI J1526140+204341 BD* 15 26 14.0097630623 +20 43 40.439684259           L5 46 0
74 2MASSI J1546271-332511 BD* 15 46 27.18600 -33 25 11.1828           T5.7 34 1
75 2MASS J16150413+1340079 BD* 16 15 04.13496 +13 40 07.9284           T6 21 0
76 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 162 0
77 2MASS J16322911+1904407 BD* 16 32 29.11416 +19 04 40.7136       22.42 19.98 L8V 145 0
78 2MASS J16452211-1319516 BD* 16 45 22.0921435313 -13 19 52.257875238           L1.5 46 0
79 VB 8 LM* 16 55 35.2557374336 -08 23 40.753073075   18.7 16.916 14.566 12.24 M7Ve 457 0
80 2MASS J17503293+1759042 BD* 17 50 32.93832 +17 59 04.2504           T3.5 56 0
81 2MASS J18071593+5015316 BD* 18 07 15.9375533592 +50 15 31.636789740           L1 54 0
82 2MASS J18283572-4849046 BD* 18 28 35.72256 -48 49 04.6380           T6 31 0
83 SCR J1845-6357 LM* 18 45 05.2532493080 -63 57 47.450109578     17.40 14.99 12.46 M8.5V 77 1
84 SCR J1845-6357B BD* 18 45 05.2560 -63 57 47.808           T6 35 0
85 2MASS J19010601+4718136 BD* 19 01 06.01920 +47 18 13.6620           T5 20 0
86 VB 10 PM* 19 16 57.6109547886 +05 09 01.600923413     17.30     M8V 499 1
87 2MASSI J2002507-052152 BD* 20 02 50.7115352376 -05 21 52.556536728           L5.5 43 0
88 2MASS J20282035+0052265 BD* 20 28 20.3489639184 +00 52 26.588682516           L2.5 43 0
89 LP 927-32 LM* 20 39 23.8211249030 -29 26 34.669490930     17.618 15.637 13.523 M6Ve 28 0
90 SIPS J2049-1944 LM* 20 49 19.7504586496 -19 44 32.750924046       17.850 15.449 M7.5e 24 0
91 2MASS J20575409-0252302 BD* 20 57 54.0936475128 -02 52 30.247487652           L1 71 0
92 2MASS J21073169-0307337 BD* 21 07 31.6891615128 -03 07 33.669058548           L0 22 0
93 CFBDS J212413+010002 BD* 21 24 13.87968 +00 59 59.9172           T6 28 0
94 2MASS J21321145+1341584 BD* 21 32 11.45376 +13 41 58.4124           L4.5+L8.5 29 0
95 CFBDS J213926+022023 BD* 21 39 26.76936 +02 20 22.6968           L8.5+T3.5 108 0
96 V* HN Peg B BD* 21 44 28.47168 +14 46 07.7988           T2.5 143 0
97 2MASS J21512543-2441000 BD* 21 51 25.43136 -24 41 00.0600       21.831 19.252 L3 19 0
98 2MASS J21513839-4853542 BD* 21 51 38.39304 -48 53 54.2508           T4.5 21 0
99 2MASS J21543318+5942187 BD* 21 54 33.18696 +59 42 18.7740           T6 21 0
100 LP 459-419 PM* 22 12 03.5244084961 +16 41 09.097112159   18.1   16.24   dM6.5 15 0
101 2MASS J22282889-4310262 BD* 22 28 28.89432 -43 10 26.2740           T6.5 74 0
102 2MASS J22341394+2359559 LM* 22 34 14.0191104024 +23 59 55.879228988           M9.5e 26 0
103 2MASS J22495345+0044046 BD* 22 49 53.45592 +00 44 04.6608           L3+L5 49 0
104 2MASSI J2254188+312349 BD* 22 54 18.92016 +31 23 49.8300           T5.0 80 0
105 2MASS J23312378-4718274 BD* 23 31 23.78712 -47 18 27.4356           T5 25 0
106 2MASSI J2339101+135230 BD* 23 39 10.25160 +13 52 28.4772           T5.4 32 0
107 SSSPM J2352-2538 LM* 23 51 50.4633005025 -25 37 36.861356975           M9e 50 0
108 APMPM J2354-3316C LM* 23 54 09.2806070800 -33 16 26.761079407         16.00 M8.5Ve 25 0
109 2MASSI J2356547-155310 BD* 23 56 54.77040 -15 53 11.1336           T5.8 48 0

To bookmark this query, right click on this link: simbad:objects in 2008ApJ...681..579B and select 'bookmark this link' or equivalent in the popup menu