2014ApJ...785..159M

Query : 2014ApJ...785..159M

2014ApJ...785..159M - Astrophys. J., 785, 159 (2014/April-3)

Substellar objects in nearby young clusters (SONYC). VIII. Substellar population in Lupus 3.

MUZIC K., SCHOLZ A., GEERS V.C., JAYAWARDHANA R. and LOPEZ MARTI B.

Abstract (from CDS):

SONYC–Substellar Objects in Nearby Young Clusters–is a survey program to investigate the frequency and properties of substellar objects in nearby star-forming regions. We present a new imaging and spectroscopic survey conducted in the young (∼1 Myr), nearby (∼200 pc) star-forming region Lupus 3. Deep optical and near-infrared images were obtained with MOSAIC-II and NEWFIRM at the CTIO 4 m telescope, covering ∼1.4 deg2 on the sky. The i-band completeness limit of 20.3 mag is equivalent to 0.009-0.02 M☉, for AV ≤ 5. Photometry and 11-12 yr baseline proper motions were used to select candidate low-mass members of Lupus 3. We performed a spectroscopic follow-up of 123 candidates, using VIMOS at the Very Large Telescope, and we identify 7 probable members, among which 4 have spectral type later than M6.0 and Teff ≤ 3000 K, i.e., are probably substellar in nature. Two of the new probable members of Lupus 3 appear underluminous for their spectral class and exhibit emission line spectrum with strong Hα or forbidden lines associated with active accretion. We derive a relation between the spectral type and effective temperature: Teff= (4120±175) - (172±26)xSpT, where SpT refers to the M spectral subtype between 1 and 9. Combining our results with the previous works on Lupus 3, we show that the spectral type distribution is consistent with that in other star-forming regions, as well as the derived star-to-brown dwarf ratio of 2.0-3.3. We compile a census of all spectroscopically confirmed low-mass members with spectral type M0 or later.

Abstract Copyright: ∼

Journal keyword(s): brown dwarfs - stars: formation - stars: low-mass - stars: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/ApJ/785/159): table2.dat table3.dat table4.dat>

Nomenclature: Table 2: SONYC Lup3-NN (Nos 1-27).

Simbad objects: 115

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Number of rows : 115
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 NGC 1333 OpC 03 29 09.2 +31 20 59           ~ 1575 1
2 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
4 Cl Collinder 69 OpC 05 35 32.1 +09 44 02     2.8     ~ 369 0
5 * eta Cha Pu* 08 41 19.5125857944 -78 57 48.105898056 5.02 5.351 5.453     B8V 246 0
6 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
7 Lupus 1 Cld 15 43 02.1 -34 09 06           ~ 320 0
8 HD 325367 Or* 16 03 05.4915085848 -40 18 25.426727676   11.40 8.50     M0 406 0
9 Lupus 4 MoC 16 03 12.4 -42 07 43           ~ 163 0
10 2MASS J16052862-3846210 Y*? 16 05 28.6224621192 -38 46 21.098396424       17.06 14.74 M6 7 0
11 V* HO Lup Or* 16 07 00.603672 -39 02 19.49316   13.94 13.17 13.03   M1e 70 0
12 2MASS J16070384-3911113 Or* 16 07 03.84336 -39 11 11.3208       18.79 16.80 M4.5 47 0
13 2MASS J16070854-3914075 LM* 16 07 08.5530917712 -39 14 07.494035352   17.85   18.67 17.86 M1.75 44 0
14 SONYC Lup3-24 * 16 07 09.06 -39 01 07.6           M1.50 1 0
15 THA 15-20 TT* 16 07 11.5873449384 -39 03 47.492129340   16.25 14.58 14.11 12.92 M0.5 122 0
16 SONYC Lup3-2 LM? 16 07 33.82 -39 03 26.5           M3.00 1 0
17 SONYC Lup3-13 RG* 16 07 36.48 -39 04 53.8           M0.00 1 0
18 2MASS J16073773-3921388 Or* 16 07 37.7327699304 -39 21 38.745260928   18.38 17.4 17.12 15.68 M5.5e 48 0
19 Sz 94 TT* 16 07 49.5974149968 -39 04 28.760342844   16.31 16.00 14.76 12.90 ~ 39 0
20 Sz 95 TT* 16 07 52.3109740056 -38 58 06.091698756   16.714 15.189 14.934 12.53 ~ 66 0
21 SONYC Lup3-15 * 16 07 52.46 -39 09 48.1           M2.50 1 0
22 SONYC Lup3-3 LM* 16 07 55.1838796776 -39 06 03.793003452       18.83 16.06 M6.5 10 0
23 2MASS J16075888-3924347 TT* 16 07 58.8952865040 -39 24 34.774540992   17.34 17.8 16.58 14.74 M4.5 18 0
24 2MASS J16080017-3902595 Or* 16 08 00.1718615064 -39 02 59.504573976   16.94 17.01 16.72 14.31 M5.5e 53 0
25 SONYC Lup3-14 LM? 16 08 01.42 -39 10 16.1           <M1 1 0
26 2MASS J16080475-3904495 LM* 16 08 04.7606778408 -39 04 49.513861992       19.62 16.76 M7 9 0
27 Sz 96 TT* 16 08 12.6308620920 -39 08 33.470354256   14.80 13.43 13.69 11.84 ~ 87 0
28 2MASS J16081497-3857145 Or* 16 08 14.9753942112 -38 57 14.409165492       18.93 17.42 4.75 48 0
29 SONYC Lup3-5 LM* 16 08 16.0404001440 -39 03 04.320708732   17.74 19.92 18.15 15.28 M7.5 36 0
30 THA 15-24 Or* 16 08 21.8037909864 -39 04 21.491863824   16.18 14.61 14.67 12.92 M3 70 0
31 V* V1279 Sco Or* 16 08 22.4935277520 -39 04 46.427612052   14.99 13.66 11.70 11.21 M0.4 154 1
32 THA 15-25 Or* 16 08 24.0422612880 -39 05 49.433170740   15.49 16.00 15.39 14.17 M3.5 59 0
33 THA 15-26 Or* 16 08 25.7633674272 -39 06 01.247043888   16.62 15.43 14.97 13.12 M5 79 0
34 SSTc2d J160828.1-391310 Or* 16 08 28.1226362485 -39 13 09.781567277   17.45   17.76 16.13 M6.5 33 0
35 THA 15-27 Y*O 16 08 28.43136 -39 05 32.4312   17.03 15.46 14.00 12.35 M4 29 0
36 WRAY 16-203 Or* 16 08 29.7275063376 -39 03 11.024360496   16.26 15.91 15.38 15.69 K0: 180 1
37 THA 15-29 Or* 16 08 30.2687378568 -39 06 11.176056000   14.8 11.14 15.18 13.15 M4 76 0
38 THA 15-30 TT* 16 08 30.8142130416 -39 05 48.837746436   15.2 15.25 13.96 13.57 M5 73 0
39 SONYC Lup3-28 LM* 16 08 33.0523649616 -38 52 22.432604376       17.96 15.37 M7.5 13 0
40 V* V856 Sco Ae* 16 08 34.2870044544 -39 06 18.325711332 7.66 7.41 7.05 6.92   A9V_sh 405 0
41 V* V1027 Sco a2* 16 08 34.5616203192 -39 05 34.278268848   6.552 6.629 6.66   A0/3III 204 0
42 2MASS J16083547-3900358 ** 16 08 35.47512 -39 00 35.8416         13.88 M6.5 6 0
43 UCAC3 102-194847 Or* 16 08 35.7826940376 -39 03 47.933557092   16.88 15.49 15.02 13.09 M6 39 0
44 THA 15-31 Or* 16 08 36.9025257864 -40 16 20.380514952   15.0 14     M4 24 0
45 2MASS J16083733-3923109 Or* 16 08 37.3331402112 -39 23 10.926378348   20.1 19.1 20.70 18.44 M7.5e 28 0
46 2MASS J16083974-3929228 Y*? 16 08 39.7447960992 -39 29 22.869438036       15.44 13.49 M5 8 0
47 Sz 106 Or* 16 08 39.7597402848 -39 06 25.321212288   15.1   15.00 14.66 M2.5 55 0
48 Sz 107 Or* 16 08 41.7980924472 -39 01 37.038551232   17.31 16.06 15.42 13.20 M5.5 48 0
49 Sz 108 TT* 16 08 42.7394012688 -39 06 18.313411608   14.497 13.058 12.824 11.16 M3Ve: 47 0
50 NAME Sz 108B Or* 16 08 42.8838783888 -39 06 14.692839804       17.71 14.39 M6Ve 44 0
51 V* V1191 Sco TT* 16 08 48.1612456128 -39 04 19.195145724   18.23 16.43 15.71 13.57 M6.5 26 0
52 2MASS J16084817-3909197 Or* 16 08 48.1774909152 -39 09 19.828771092   17.27 17.41 17.29 15.02 ~ 14 0
53 IRAS 16054-3857 Or* 16 08 49.3987083072 -39 05 39.447341844   16.76 17.71 15.89 14.24 M4.5 61 0
54 V* V1192 Sco Or* 16 08 51.4348063536 -39 05 30.460358652     21.9 18.97 18.18 M5 78 0
55 V* V1193 Sco Or* 16 08 51.5693655096 -39 03 17.707587264   15.27 14.58 13.72 12.28 M4.5 82 0
56 2MASS J16085373-3914367 Or* 16 08 53.7357629040 -39 14 36.799256184       21.73 18.76 M5.5 41 0
57 THA 15-33 TT* 16 08 54.6849382512 -39 37 43.145069664   15.34 13.98 13.29   M1IVe 109 0
58 2MASS J16085529-3848481 Or* 16 08 55.2899613672 -38 48 48.174613416   17.36   17.24 15.24 M6.5 43 1
59 Sz 112 Or* 16 08 55.5289090032 -39 02 33.941081832   16.62 15.39 14.78 12.93 M6 76 0
60 2MASS J16085575-3826330 Y*? 16 08 55.7460506784 -38 26 33.074473632       16.76 14.78 M5.5 8 0
61 THA 15-34 Or* 16 08 57.8026653048 -39 02 22.853868252   17.46 16.50 16.64 14.65 M6 67 0
62 2MASS J16085953-3856275 Or* 16 08 59.5395612120 -38 56 27.592929708       19.25 16.91 M8.5e 38 0
63 SONYC Lup3-6 LM* 16 08 59.5426975033 -38 56 20.419242697           M4.75 2 0
64 2MASS J16090141-3925119 Or* 16 09 01.4148377304 -39 25 11.923332420   16.92 15.31 15.04 13.48 M4 58 0
65 THA 15-35 Or* 16 09 01.8486544824 -39 05 12.414717240   15.33 14.12 14.35 12.54 M5.5 142 0
66 2MASS J16090452-3921125 Y*? 16 09 04.5246160776 -39 21 12.497203224       14.61 12.52 M5 7 0
67 Sz 115 TT* 16 09 06.2137580736 -39 08 51.873869400   16.88 15.48 15.09 13.12 ~ 58 0
68 2MASS J16090850-3903430 TT* 16 09 08.5062297456 -39 03 43.080273612   18.00 16.60 16.43 14.16 M5.0 21 0
69 SONYC Lup3-10 LM* 16 09 13.43 -38 58 04.9           M8.75 2 0
70 2MASS J16091570-3851396 Y*? 16 09 15.7035853584 -38 51 39.540289932       15.42 13.72 M5 9 0
71 2MASS J16091713-3927096 TT* 16 09 17.1451249440 -39 27 09.591968160   17.66 18.5 17.76 15.67 M5.5 13 0
72 2MASS J16092279-3855506 Y*O 16 09 22.7973325920 -38 55 50.705258016       14.58 12.62 M5 10 0
73 2MASS J16092320-3855547 TT* 16 09 23.1946497840 -38 55 54.588719532     14.42 13.41 11.86 ~ 12 0
74 2MASS J16092800-3848538 Y*O 16 09 28.0069460952 -38 48 53.764124040       16.08 13.99 M5.5 10 0
75 Lupus 3 SFR 16 09.6 -39 03           ~ 348 0
76 THA 15-36 TT* 16 09 42.565776 -39 19 41.09520   15.30 13.89 13.57 11.68 ~ 29 0
77 THA 15-37 Or* 16 09 44.3607357216 -39 13 30.167581764   15.84 14.59 14.20 12.38 M2 70 0
78 2MASS J16094986-3849029 Or* 16 09 49.8734955960 -38 49 02.958465792       19.85 17.62 ~ 7 0
79 2MASS J16095628-3859518 Or* 16 09 56.2954845696 -38 59 51.581549796   17.37 18.0 16.49 15.28 M6.0e 53 0
80 THA 15-38 TT* 16 09 57.0796720248 -38 59 48.025255020   15.35 13.71 13.49 11.96 ~ 28 0
81 THA 15-40 TT* 16 10 12.1994252424 -39 21 17.990363016   15.70 14.06 13.88 11.84 M3e 42 0
82 2MASS J16101307-3846165 Y*O 16 10 13.0661978112 -38 46 16.494246336       19.15 17.42 ~ 19 0
83 2MASS J16101386-3759589 Y*O 16 10 13.8620329440 -37 59 58.959032496       16.66 14.37 M6 8 0
84 SONYC Lup3-16 * 16 10 14.95 -39 10 16.2           M4.50 1 0
85 THA 15-41 TT* 16 10 16.4255309472 -39 08 05.033094180   15.33 13.73 13.28 12.12 M2 41 0
86 SONYC Lup3-8 LM? 16 10 18.13 -39 10 33.6           M1.00 1 0
87 2MASS J16101984-3836065 Or* 16 10 19.8333629688 -38 36 06.586243272   17.39   16.76 15.57 M6.5 41 0
88 2MASS J16102955-3922144 Or* 16 10 29.5517478000 -39 22 14.451017844   17.51 16.31 15.79 13.90 M4.5 60 0
89 2MASS J16103062-3831517 Y*? 16 10 30.6170756088 -38 31 51.745097316       17.39 15.18 M6 6 0
90 UCAC3 103-203926 Y*? 16 10 33.23016 -38 30 23.4828   16.597 15.148 14.933 12.40 M4.5 5 0
91 2MASS J16104192-3823046 Y*? 16 10 41.9167714704 -38 23 04.661359512       14.32 12.56 M5 6 0
92 2MASS J16104536-3854547 RG* 16 10 45.3653978616 -38 54 54.728034696   17.51   17.13 16.05 <M1 17 0
93 SONYC Lup3-22 LM? 16 10 47.49 -38 57 12.4           <M1 1 0
94 THA 15-42 Or* 16 10 51.5849835192 -38 53 13.767885384   15.89 14.48 14.44 12.95 M1e 84 0
95 SONYC Lup3-26 * 16 10 56.40 -39 04 31.7           M5.0 1 0
96 2MASS J16105899-3914514 Y*? 16 10 58.9982059080 -39 14 51.465672492       15.72 13.87 M5 7 0
97 SONYC Lup3-18 * 16 11 09.03 -39 06 22.7           M2.50 1 0
98 SONYC Lup3-27 * 16 11 15.08 -39 07 15.0           M7.0 1 0
99 SONYC Lup3-12 LM* 16 11 18.4727717496 -39 02 58.484380236           <M1 1 0
100 SONYC Lup3-9 LM? 16 11 26.34 -39 02 17.1           M1.00 1 0
101 2MASS J16113191-3811102 Y*O 16 11 31.9166570856 -38 11 10.254198372   18.76   15.90 14.56 ~ 8 0
102 SONYC Lup3-21 * 16 11 33.34 -38 59 44.3           M3.00 1 0
103 SONYC Lup3-20 * 16 11 36.20 -39 02 36.9           M4.00 1 0
104 2MASS J16113801-3841356 TT* 16 11 38.0194605120 -38 41 35.679110172 17.05 15.31 13.40 12.28 11.22 ~ 15 0
105 SONYC Lup3-19 RG* 16 11 39.24 -39 06 32.8           M0.50 1 0
106 2MASS J16114484-3832445 Y*O 16 11 44.8498394040 -38 32 44.556385488   17.49   17.12 14.73 ~ 14 0
107 2MASS J16115116-3851047 Or* 16 11 51.1641248592 -38 51 04.783630284   17.54 17.31 17.15 15.18 M4 10 0
108 SONYC Lup3-17 RG* 16 11 56.11 -39 08 23.8           <M1 1 0
109 2MASS J16115979-3823383 TT* 16 11 59.7947194344 -38 23 38.374012212   18.17 16.55 16.24 14.26 M5.0e 52 0
110 SONYC Lup3-25 * 16 12 04.96 -39 06 11.4           M2.50 1 0
111 2MASS J16120601-3904091 LM* 16 12 06.0162926784 -39 04 09.019365600       20.538 18.676 M3.00 2 0
112 UCAC3 104-204340 Y*O 16 12 07.6124856384 -38 13 24.387555432       14.42 12.72 M4.5 10 0
113 2MASS J16121046-3909040 Y*? 16 12 10.4644289544 -39 09 03.961604268       18.74 16.21 M6.5 4 0
114 2MASS J16122559-3817428 Y*O 16 12 25.6133468016 -38 17 42.811403928       17.42 15.30 M6 9 0
115 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 670 0

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