2005ApJ...621.1023S

Query : 2005ApJ...621.1023S

2005ApJ...621.1023S - Astrophys. J., 621, 1023-1032 (2005/March-2)

Discovery of two very low mass binaries: final results of an adaptive optics survey of nearby M6.0-M7.5 stars.

SIEGLER N., CLOSE L.M., CRUZ K.L., MARTIN E.L. and REID I.N.

Abstract (from CDS):

We present updated results of a high-resolution, magnitude-limited (Ks<12 mag) imaging survey of nearby low-mass M6.0-M7.5 field stars. The observations were carried out using adaptive optics at the Gemini North, VLT, Keck II, and Subaru telescopes. Our sample of 36 stars consists predominantly of nearby (≲30 pc) field stars, five of which we have resolved as binaries. Two of the binary systems, 2MASSI J0429184-312356 and 2MASSI J1847034+552243, are presented here for the first time. All five of the discovered binary systems have separations between 0".08 and 0".53 (2-9 AU) with similar mass ratios (q>0.8, ΔKs<1 mag). This result supports the hypothesis that wide (a>20 AU), very low mass (VLM; Mtot<0.19M☉) binary systems are rare. The projected semimajor axis distribution of these systems peak at ∼5 AU, and we report a sensitivity-corrected binary fraction of 9+4–3% for stars with primaries of spectral type M6.0-M7.5 with separations ≳3 AU and mass ratios q≳0.6. Within these instrumental sensitivities, these results support the overall trend that both the semimajor axis distribution and binary fraction are a function of the mass of the primary star and decrease with decreasing primary mass. These observations provide important constraints for low-mass binary star formation theories.

Abstract Copyright: ∼

Journal keyword(s): Stars: Binaries: General - Instrumentation: Adaptive Optics - Stars: Low-Mass, Brown Dwarfs

Status at CDS : All or part of tables of objects could be ingested in SIMBAD; there are some issues with cross-identifications or classifications.

Simbad objects: 74

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Number of rows : 74
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 LP 881-64 ** 00 24 44.1774908692 -27 08 25.263232614   17.18 15.338 13.502 11.403 M5.5/6Ve+M8.5Ve+M9/9.5V 154 0
2 DENIS J020529.0-115925 BD* 02 05 29.3651195393 -11 59 29.721210536           L7V 156 0
3 NAME Teegarden's Star LM* 02 53 00.8917932409 +16 52 52.632190137   17.21 15.14 13.03 10.65 dM6 207 0
4 LP 356-770 LM* 03 30 05.0997403728 +24 05 28.062407292   19.3 18.54 17.3 15.3 M7e 27 0
5 Cl* Melotte 22 IPMBD 29 LM* 03 45 31.3588216104 +24 52 47.651834928           ~ 12 0
6 Cl* Melotte 22 IPMBD 25 LM* 03 46 26.0867944944 +24 05 09.641476032           ~ 15 0
7 Cl* Melotte 22 PPL 15 LM* 03 48 04.6585327824 +23 39 30.318163560         17.91 M6.5 108 0
8 Cl* Melotte 22 BPL 283 LM* 03 53 23.1548800968 +23 19 20.148390372         18.34 ~ 18 0
9 Cl* Melotte 22 PLIZ 6 LM* 03 53 55.1153189928 +23 23 36.301442892         17.752 M8.0 26 0
10 2MASS J03572695-4417305 BD* 03 57 26.9613211008 -44 17 30.532793208         17.86 L0beta 43 1
11 LP 415-20 LM* 04 21 49.5764748384 +19 29 08.566062612           M7+M9.5 56 0
12 LP 475-855 LM* 04 29 02.87040 +13 37 58.6632         14.81 M7e 21 0
13 RX J0429.3-3124 LM* 04 29 18.4672536672 -31 23 56.743066104       16.2   M5.0Ve 36 0
14 LP 775-31 PM* 04 35 16.1486673944 -16 06 57.213311348     17.820 15.78 13.36 M8Ve 53 0
15 LSPM J0746+2000 BD* 07 46 42.56207 +20 00 32.1839       17.9 15.034 L0+L1.5 201 1
16 LP 423-31 PM* 07 52 23.9250338268 +16 12 14.957934141   17.7 16.73 15.8   M6.0V 60 0
17 LSPM J0818+2333 PM* 08 18 58.0142578714 +23 33 51.585203370   20.5   17.0   M7e 29 0
18 2MASS J08503593+1057156 BD* 08 50 35.93400 +10 57 15.6168       22.466 20.349 L6.5+L8.5 85 0
19 2MASS J08564793+2235182 BD* 08 56 47.9153673048 +22 35 18.292009308           L3 26 0
20 2MASSW J0920122+351742 BD* 09 20 12.23664 +35 17 42.9684           L5.5+L9 52 0
21 2MASSI J0952219-192431 LM* 09 52 21.8872375272 -19 24 32.203844316     18.349 16.402 14.199 M7Ve 38 0
22 LP 315-53 LM* 10 16 34.6688204247 +27 51 48.826153026   19.5 18.946 16.858 14.555 M8V 73 0
23 LSPM J1024+1815 LM* 10 24 09.9507669912 +18 15 53.019085464   20.0   17.1   M7e 21 0
24 LP 213-67 LM* 10 47 12.6095390983 +40 26 43.737443862   19.2       M6.5Ve 47 1
25 LSPM J1049+2538 LM* 10 49 41.4273547728 +25 38 53.303275824   20.2   17.0   M6e 15 0
26 2MASS J11011926-7732383 ** 11 01 19.266 -77 32 38.31       19.4 16.59 M7+M8 36 0
27 HD 97334B BD* 11 12 25.6353966120 +35 48 12.742807176           L4.5+L6 95 0
28 LP 732-94 SB* 11 21 49.1708652037 -13 13 08.693807585     19.57     M8.5V 147 1
29 2MASSI J1124532+132253 LM* 11 24 53.2665269928 +13 22 52.900456476           M5.5 11 0
30 2MASSI J1127534+741107 LM* 11 27 53.4339959376 +74 11 07.566305316           M8e 10 0
31 2MASS J11463449+2230527 BD* 11 46 34.5341033040 +22 30 54.036482400           L3+L4 94 0
32 LSPM J1200+2048 LM* 12 00 32.9030746656 +20 48 51.384235176   21.4   19.1   M8V 32 0
33 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 376 0
34 2MASS J12255432-2739466 BD* 12 25 54.32328 -27 39 46.6776           T5.5+T8 67 0
35 SIPS J1228-1547 BD* 12 28 15.23184 -15 47 34.2312       20.414 18.042 L5.5+L5.5 151 0
36 2MASS J12372705-2117481 LM* 12 37 27.0288851352 -21 17 48.133399344       17.181 14.919 M6e 8 0
37 2MASSW J1239272+551537 BD* 12 39 27.27287 +55 15 37.1630           L5V 47 0
38 LP 321-222 LM* 12 46 51.6144758160 +31 48 10.900214430   19.9   17.7   M5V 41 0
39 LP 218-8 LM* 12 53 12.4299447040 +40 34 02.691851911   20.1   17.5   M7Ve 49 0
40 LSPM J1311+8032 ** 13 11 39.2572362000 +80 32 21.953177772   21.4   18.6   M7.5+M8 16 0
41 2MASS J13365044+4751321 LM* 13 36 50.4688214328 +47 51 32.198153040           M8V 20 0
42 V* WY UMi PM* 13 44 58.3020615912 +77 15 51.349135860           M7e 7 0
43 LP 220-13 PM* 13 56 41.4543005078 +43 42 59.080742558   20.4   17.3   M8V 42 0
44 2MASSI J1426316+155701 LM* 14 26 31.6133387736 +15 57 01.066079268       18.320 15.819 M9V 32 0
45 LP 440-35 LM* 14 31 30.3904858872 +17 17 57.706097028   18.4   16.8   M6.5 13 0
46 DENIS J144137.2-094558 BD* 14 41 37.1567200536 -09 45 59.229849096       20.030 17.234 L1+L1 61 0
47 2MASSW J1449378+235537 BD* 14 49 37.8493181976 +23 55 37.884727668           L0V 16 0
48 NAME HD 130948BC BD* 14 50 16.00 +23 54 41.8           L4+L4 75 0
49 BD+16 2708B SB* 14 54 29.4185719182 +16 06 08.616294953           M8.5 143 0
50 LP 135-272 LM* 15 21 01.0497945984 +50 53 22.801588116   20.9   18.1   M7.5 35 0
51 LSPM J1524+2925 LM* 15 24 24.7592952355 +29 25 31.544540909   20.4   16.6   M7.5V 30 0
52 PM J15273+4130N PM* 15 27 19.2717181008 +41 30 44.968431564       17.68   M6.5 12 0
53 2MASSI J1534498-295227 BD* 15 34 49.84080 -29 52 27.4188           T4.5+T5 73 0
54 LP 328-36 LM* 15 43 58.1280653616 +32 06 42.039103392   18.6   17.0   M6.5e 10 0
55 2MASSI J1546054+374946 PM* 15 46 05.4098698968 +37 49 45.887257992       18.05   M7.5V 23 0
56 LSPM J1550+3041 LM* 15 50 38.1839209872 +30 41 03.962611896   20.7   18.1   M7V 20 0
57 2MASSI J1600054+170832 BD* 16 00 05.4775186992 +17 08 32.725071672           L1.5V 15 0
58 2MASSW J1728114+394859 BD* 17 28 11.50056 +39 48 59.3100           L5+L6.5 65 0
59 LSPM J1750+4424 LM* 17 50 12.9048979032 +44 24 04.388509332   21.0   18.8   M6.5+M8.5 26 0
60 LP 44-162 LM* 17 57 15.4028425766 +70 42 01.191850031   20.4 18.79 17.0 14.12 M7.5V 43 0
61 LSR J1835+3259 PM* 18 35 37.8801226673 +32 59 53.316099140   20.0   17.1   M8.5V 160 0
62 2MASSI J1847034+552243 SB* 18 47 03.4341091776 +55 22 43.458679704   18.7   16.4   M6+M7 15 0
63 2MASS J18595094-3706313 Or* 18 59 50.9461096368 -37 06 31.493373948           M5.75 22 1
64 LP 872-22 LM* 20 52 08.5882795503 -23 18 10.138588364     19.95 17.32   M6.5e 16 0
65 2MASS J21402931+1625183 ** 21 40 29.3219106816 +16 25 18.097174704         15.36 M8+M9.5 35 0
66 ** BOY 12 LM* 21 47 43.6526221656 +14 31 31.439372700           M8e 9 0
67 * eps Ind B BD* 22 04 10.5951812451 -56 46 58.239102418     24.12 20.8 15.60 T1V+T6V 176 1
68 2MASSW J2206228-204705 SB* 22 06 22.8297746064 -20 47 06.597790152     19.788 17.452 14.877 M8.0V 50 0
69 LP 399-314 LM* 22 21 54.4207545342 +27 29 06.613883943   19.8   16.6   M6e 10 0
70 LP 288-31 LM* 22 33 47.8609481928 +35 47 47.310477540   18.8   16.6   M6e 17 0
71 LP 460-44 LM* 22 35 49.1191098853 +18 40 29.945129302   20.4   17.7   M7e 25 0
72 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0
73 LP 462-11 CV* 23 13 47.3343443160 +21 17 29.337707544   17.9   15.5   M7.5V 21 0
74 NAME HD 221356BC ** 23 31 01.6270258272 -04 06 19.516808592       19.2 15.51 M8.0V+L3.0V 34 0

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