2011ApJ...726...23G

Query : 2011ApJ...726...23G

2011ApJ...726...23G - Astrophys. J., 726, 23 (2011/January-1)

Substellar objects in nearby young clusters (SONYC). II. The brown dwarf population of ρ Ophiuchi.

GEERS V., SCHOLZ A., JAYAWARDHANA R., LEE E., LAFRENIERE D. and TAMURA M.

Abstract (from CDS):

SONYC–Substellar Objects in Nearby Young Clusters–is a survey program to investigate the frequency and properties of brown dwarfs (BDs) down to masses below the deuterium-burning limit in nearby star-forming regions. In this second paper, we present results on the ∼1 Myr old cluster ρ Ophiuchi, combining our own deep optical- and near-infrared imaging using Subaru with photometry from the Two Micron All Sky Survey and the Spitzer Space Telescope. Of the candidates selected from iJKsphotometry, we have confirmed three–including a new BD with a mass close to the deuterium limit–as likely cluster members through low-resolution infrared spectroscopy. We also identify 27 substellar candidates with mid-infrared excess consistent with disk emission, of which 16 are new and 11 are previously spectroscopically confirmed BDs. The high and variable extinction makes it difficult to obtain the complete substellar population in this region. However, current data suggest that its ratio of low-mass stars to BDs is similar to those reported for several other clusters, though higher than what was found for NGC 1333 in Scholz et al.

Abstract Copyright: ∼

Journal keyword(s): brown dwarfs - circumstellar matter - stars: formation - stars: low-mass

Nomenclature: Table 1: [GSJ2011] NN (Nos 1-27). Table 2: SONYC RhoOph-N (Nos 1-2).

Simbad objects: 68

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Number of rows : 68
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 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
3 BKLT J162532-243404 LM* 16 25 32.4211514208 -24 34 05.046026628           M6.5 10 0
4 BKLT J162542-244350 BD? 16 25 42.5349622176 -24 43 51.097289952           ~ 2 0
5 BKLT J162604-241753 Y*O 16 26 04.57776 -24 17 51.4824           M4.5 19 0
6 BKLT J162618-242951 LM* 16 26 18.58104 -24 29 51.4860           M6.75 20 0
7 CRBR 2317.3-1925 Y*O 16 26 18.82056 -24 26 10.5216           M7 47 0
8 [GY92] 5 Or* 16 26 21.5381846568 -24 26 00.994958844       18.30 15.80 M7 77 1
9 [GY92] 3 Or* 16 26 21.9078410496 -24 44 39.697627344       17.95 15.62 M6.5 62 0
10 [GY92] 10 Y*O 16 26 22.18584 -24 23 52.3572           M8.5 33 0
11 [RR90] Oph 2320.8-1721 Y*O 16 26 22.26912 -24 24 07.0632           M8 72 0
12 CRBR 2322.3-1143 LM* 16 26 23.81424 -24 18 29.0016           M6.7 28 0
13 [GY92] 31 Y*O 16 26 25.23384 -24 23 23.9208           M5.5 28 1
14 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 312 1
15 VSSG 29 LM* 16 26 27.8153977560 -24 26 41.853907500         17.85 M5 49 1
16 [GY92] 59 TT* 16 26 31.3666819344 -24 25 30.308255112         18.90 M3.75 23 1
17 [GY92] 64 Y*O 16 26 32.52576 -24 26 35.4480           M8 24 0
18 V* V2675 Oph Or* 16 26 36.8195427312 -24 19 00.220560852           M3.25 24 1
19 [GY92] 80 LM* 16 26 37.8105478872 -24 39 03.114912780           M5.25-5.5 27 0
20 [GY92] 84 Y*O 16 26 38.80368 -24 23 22.7328           M6 22 0
21 [GY92] 90 LM* 16 26 39.91704 -24 22 33.4272           M8.25 20 0
22 BKLT J162640-242046 * 16 26 40.06872 -24 20 44.1888           ~ 3 0
23 [GY92] 119 * 16 26 46.12104 -24 21 53.7588           ~ 4 0
24 [RR90] Oph 2349.8-2601 Or* 16 26 51.2924609616 -24 32 42.001375272           M8.5 57 0
25 2MASS J16265226-2401466 LM* 16 26 52.260 -24 01 46.70           M7.5 5 0
26 [GY92] 149 * 16 26 54.02616 -24 42 56.0124           ~ 3 0
27 [GY92] 155 Y*? 16 26 55.41768 -24 42 43.5276           ~ 5 0
28 [GY92] 158 * 16 26 56.1895907328 -24 43 38.995839804           ~ 3 0
29 SONYC RhoOph-1 BD* 16 26 56.33520 -24 42 37.7244           L0 8 0
30 CFHTWIR-Oph 53 BD* 16 26 56.36976 -24 41 20.4576           L3? 12 0
31 SONYC RhoOph-2 BD? 16 26 57.34944 -24 42 18.6876           ~ 2 0
32 [GY92] 170 * 16 26 58.62504 -24 43 44.1804           ~ 3 0
33 2MASS J16265867-2424555 Y*O 16 26 58.67448 -24 24 55.5768           M4-7 12 0
34 WL 14 Or* 16 26 59.04984 -24 35 56.8788           ~ 53 0
35 NAME rho Oph E MoC 16 27 02.0 -24 38 31           ~ 65 0
36 [GY92] 191 * 16 27 03.53376 -24 44 01.1004           ~ 3 0
37 CFHTWIR-Oph 57 LM* 16 27 04.0204966776 -24 02 47.127727500           M7.25 5 0
38 [GY92] 196 V* 16 27 05.0378092872 -24 44 22.978709484           ~ 4 0
39 BBRCG 21 Y*O 16 27 05.97624 -24 28 36.3252           M7 40 0
40 [GY92] 201 Or* 16 27 06.0467528760 -24 38 12.325167060           ~ 13 0
41 [GY92] 204 TT* 16 27 06.5924837856 -24 41 48.871282992       17.57 15.43 M5 113 0
42 [GY92] 208 Y*? 16 27 08.19456 -24 42 28.6776           ~ 6 0
43 NAME rho Oph B Cloud MoC 16 27 11 -24 28.5           ~ 88 1
44 [GY92] 258 TT* 16 27 24.39000 -24 41 47.5620           ~ 23 0
45 [MPK2010b] 4450 BD? 16 27 25.35 -24 25 37.5           ~ 6 0
46 BKLT J162726-241925 Y*O 16 27 26.22336 -24 19 22.9980           M7.75 30 0
47 [GY92] 264 LM* 16 27 26.5812811008 -24 25 54.395321448       17.90 15.72 M8 60 0
48 BBRCG 58 Y*O 16 27 32.13768 -24 29 43.5696           M6 25 0
49 NAME rho Oph F MoC 16 27 37.3 -24 42 28           ~ 65 0
50 BKLT J162737-241756 Or* 16 27 37.4277519528 -24 17 54.924640440           M7.5 36 0
51 [GY92] 310 Or* 16 27 38.6295993720 -24 38 39.214842072         17.40 M8 70 0
52 [GY92] 312 Y*O 16 27 38.94456 -24 40 20.6724           M2.5 52 0
53 [GY92] 320 LM* 16 27 40.8466548528 -24 29 00.785382684           M7.75 29 0
54 [GY92] 322 Y*O 16 27 41.49432 -24 35 37.6656           ~ 19 0
55 2MASS J16274178-2442346 Y*O 16 27 41.788 -24 42 34.60           ~ 12 0
56 [GY92] 325 * 16 27 42.6446045208 -24 42 15.627921552           ~ 3 0
57 [GY92] 333 * 16 27 43.54416 -24 28 21.4788           ~ 4 0
58 [GY92] 347 * 16 27 45.84504 -24 29 52.3248           ~ 3 0
59 [GY92] 350 Or* 16 27 46.2923939352 -24 31 41.243157372           M7.5 46 0
60 2MASS J16274825-2442256 BD? 16 27 48.25 -24 42 25.6           ~ 14 0
61 BKLT J162748-242542 * 16 27 48.34 -24 25 42.1           ~ 2 0
62 BKLT J162750-242544 * 16 27 50.81376 -24 25 44.2236           ~ 3 0
63 [GY92] 423 * 16 27 59.4460332456 -24 29 12.016397436           ~ 3 0
64 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
65 BKLT J162812-241138 Or* 16 28 12.7235398560 -24 11 35.716712676           M6 40 0
66 BKLT J162817-241706 Y*O 16 28 17.7432826872 -24 17 05.145877680           M5 12 0
67 BKLT J162830-245403 LM* 16 28 29.9242568088 -24 54 06.361602084           M6.5 10 0
68 SA 112- reg 20 42 07 +00 31.4           ~ 23 0

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