2009ApJ...702..805S


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.09CEST07:15:14

2009ApJ...702..805S - Astrophys. J., 702, 805-822 (2009/September-1)

Substellar objects in nearby young clusters (SONYC): the bottom of the initial mass function in NGC 1333.

SCHOLZ A., GEERS V., JAYAWARDHANA R., FISSEL L., 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 substellar objects with masses down to a few times that of Jupiter in nearby star-forming regions. Here, we present the first results from SONYC observations of NGC 1333, a ∼1 Myr old cluster in the Perseus star-forming complex. We have carried out extremely deep optical and near-infrared imaging in four bands (i', z', J, K) using Subaru Prime Focus Camera and Multi-Object InfraRed Camera and Spectrograph (MOIRCS) instruments at the Subaru telescope. The survey covers 0.25 deg2 and reaches completeness limits of 24.7 mag in the i' band and 20.8 mag in the J band. We select 196 candidates with colors as expected for young, very low mass objects. Follow-up multi-object spectroscopy with MOIRCS is presented for 53 objects. We confirm 19 objects as likely brown dwarfs (BDs) in NGC 1333, seven of them previously known. Nine additional objects are classified as possible stellar cluster members, likely with early to mid M spectral types. The confirmed objects are strongly clustered around the peak in the gas distribution and the core of the cluster of known stellar members. For 11 of them, we confirm the presence of disks based on Spitzer/Infrared Array Camera photometry. The effective temperatures for the BD sample range from 2500 K to 3000 K, which translates to masses of ∼0.015-0.1 M, based on model evolutionary tracks. For comparison, the completeness limit of our survey translates to mass limits of 0.004 M for AV≲ 5 mag or 0.008 M for AV≲ 10 mag. Compared with other star-forming regions, NGC 1333 shows an overabundance of BDs relative to low-mass stars, by a factor of 2-5. On the other hand, NGC 1333 has a deficit of planetary-mass objects: based on the surveys in σ Orionis, the Orion Nebula Cluster and Chamaeleon I, the expected number of planetary-mass objects in NGC 1333 is 8-10, but we find none. It is plausible that our survey has detected the minimum mass limit for star formation in this particular cluster, at around 0.012-0.02 M. If confirmed, our findings point to significant regional/environmental differences in the number of BDs and the minimum mass of the initial mass function.

Abstract Copyright:

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

Nomenclature: Tables 1-2: [SGJ2009] NN (Nos 1-28) = SONYC NGC 1333-NN (Nos 1-28).

Simbad objects: 45

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Number of rows : 45

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2MASS J03284323+3110425 Y*O 03 28 43.23096 +31 10 42.5964           ~ 16 0
2 2MASS J03284734+3111298 Y*? 03 28 47.345 +31 11 29.86           ~ 5 0
3 MBO 139 LM* 03 28 47.66040 +31 21 54.6084           M9.2 3 0
4 2MASS J03285097+3123479 Y*O 03 28 50.9737635143 +31 23 47.774454104           M4.0 11 0
5 ASR 109 LM* 03 28 54.928 +31 15 29.01           M7.9 9 0
6 ASR 38 Y*O 03 28 55.2526319531 +31 17 35.366189033           M8V 9 0
7 [SGJ2009] 4 LM* 03 28 56.41 +31 16 03.6           M9.6 3 0
8 MBO 91 LM* 03 28 56.9361319141 +31 20 48.627639468           M7V 7 0
9 ASR 64 Y*O 03 28 57.11 +31 19 11.9           M7.3 16 0
10 MBO 80 Y*O 03 28 58.4230989158 +31 22 56.732336763           M7V 8 0
11 2MASS J03290069+3122008 Y*O 03 29 00.69648 +31 22 00.8256           M1.5 10 0
12 ASR 3 Y*O 03 29 02.1579763820 +31 16 11.437787334           M4V 15 0
13 ASR 63 Y*O 03 29 03.39816 +31 18 39.9528           M7.5V 14 0
14 [SGJ2009] 9 LM* 03 29 05.549 +31 10 14.22           M8 3 0
15 2MASS J03290566+3120107 Y*O 03 29 05.664 +31 20 10.72           ~ 7 0
16 MBO 141 LM* 03 29 07.11 +31 23 22.8           M9.2 3 0
17 2MASS J03290832+3120203 Y*O 03 29 08.3258468992 +31 20 20.303837650           M4.0 11 0
18 2MASS J03290933+3121042 Y*O 03 29 09.330 +31 21 04.20           ~ 14 0
19 MBO 62 LM* 03 29 10.7956733290 +31 22 30.120345738           M7.5V 7 0
20 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1261 1
21 ASR 85 Y*O 03 29 11.63880 +31 20 37.4784           ~ 14 0
22 MBO 66 Y*O 03 29 14.4339295021 +31 22 36.191417751           M6.5V 7 0
23 MBO 79 Y*O 03 29 16.8124112656 +31 23 25.225811768           M2.5V 14 0
24 ASR 80 Y*O 03 29 17.7561777616 +31 19 48.138269608           M6.5V 15 0
25 2MASS J03291865+3120178 Y*O 03 29 18.658 +31 20 17.81           ~ 14 0
26 2MASS J03291987+3118478 * 03 29 19.87 +31 18 47.9           ~ 6 0
27 MBO 177 * 03 29 22.30 +31 21 37.1           ~ 2 0
28 2MASS J03292805+3118391 * 03 29 28.0520928925 +31 18 39.087352935           ~ 4 0
29 2MASS J03292815+3116285 Y*O 03 29 28.1541354595 +31 16 28.578328319           M7.5 11 0
30 [SGJ2009] 28 * 03 29 33.50 +31 17 56.5           ~ 1 0
31 2MASS J03293387+3120362 LM* 03 29 33.8853237266 +31 20 36.019307963           M7.5 4 0
32 [GMM2008] 129 Y*O 03 29 35.70 +31 21 08.6           M8.2 4 0
33 [SGJ2009] 19 LM* 03 29 36.36 +31 17 49.8           ~ 2 0
34 [BLH2002] KPNO-Tau 1 LM* 04 15 14.7224038902 +28 00 09.386264531     24.063     M8.5Ve 38 0
35 [BLH2002] KPNO-Tau 5 LM* 04 29 45.6733565875 +26 30 46.559502443     19.690 19.10 15.08 M7.5Ve 50 0
36 2MASS J04312405+1800215 TT* 04 31 24.0575671088 +18 00 21.455153686   20.38 18.678   14.32 M7 65 0
37 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3691 0
38 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2056 1
39 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 501 0
40 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1087 1
41 LP 666-9 LM* 08 53 36.1607609203 -03 29 32.201339067     18.959 16.781 14.487 M9Ve 230 0
42 Wolf 359 Er* 10 56 28.826208 +07 00 52.34400 16.706 15.541 13.507 11.684 9.507 dM6 644 0
43 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1014 1
44 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 712 0
45 VB 10 Er* 19 16 57.6103282334 +05 09 01.588675251     17.30     M8V 443 1

    Equat.    Gal    SGal    Ecl

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2021.05.09-07:15:14

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