2008ApJ...675.1375L


Query : 2008ApJ...675.1375L

2008ApJ...675.1375L - Astrophys. J., 675, 1375-1406 (2008/March-2)

The disk population of the Chamaeleon I star-forming region.

LUHMAN K.L., ALLEN L.E., ALLEN P.R., GUTERMUTH R.A., HARTMANN L., MAMAJEK E.E., MEGEATH S.T., MYERS P.C. and FAZIO G.G.

Abstract (from CDS):

We present a census of circumstellar disks in the Chamaeleon I star-forming region. Using the Infrared Array Camera and the Multiband Imaging Photometer on board the Spitzer Space Telescope, we have obtained images of Chamaeleon I at 3.6, 4.5, 5.8, 8.0, and 24 µm. To search for new disk-bearing members of the cluster, we have performed spectroscopy on objects that have red colors in these data. Through this work, we have discovered four new members of Chamaeleon I with spectral types of M4, M6, M7.5, and L0. The first three objects are highly embedded (AJ∼5) and reside near known protostars, indicating that they may be among the youngest low-mass sources in the cluster (τ<1 Myr). The L0 source is the coolest known member of Chamaeleon I. Its luminosity implies a mass of 0.004-0.01 M, making it the least massive brown dwarf for which a circumstellar disk has been reliably detected. To characterize the disk population in Chamaeleon I, we have classified the infrared spectral energy distributions of the 203 known members that are encompassed by the Spitzer images. Through these classifications, we find that the disk fraction in Chamaeleon I is roughly constant at ∼50% from 0.01 to 0.3 M. These data are similar to the disk fraction of IC 348, which is a denser cluster at the same age as Chamaeleon I. However, the disk fraction at M≳1 M is significantly higher in Chamaeleon I than in IC 348 (65% vs. 20%), indicating longer disk lifetimes in Chamaeleon I for this mass range. Thus, low-density star-forming regions like Chamaeleon I may offer more time for planet formation around solar-type stars than denser clusters.

Abstract Copyright:

Journal keyword(s): Accretion, Accretion Disks - Stars: Planetary Systems: Protoplanetary Disks - Stars: Formation - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence

VizieR on-line data: <Available at CDS (J/ApJ/675/1375): table4.dat table5.dat table6.dat table7.dat>

Nomenclature: Tables 4-7: [L2007b] Cha JHHMMSSss+DDMMSSs N=17 added. Table 11: [FLG2003] eps Cha NN (Nos 13-21) added.

Simbad objects: 89

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Number of rows : 89
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 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1162 0
2 IC 348 OpC 03 44 34 +32 09.8           ~ 1268 1
3 V* GG Tau Or* 04 32 30.3318954228 +17 31 40.834888327 14.84 14.78 13.40 11.54   M0e+M2.0e 678 1
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3790 0
5 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 511 0
6 NGC 2362 OpC 07 18 41 -24 57.3           ~ 370 0
7 NAME eta Cha Association MGr 08 42 06 -79 01.6           ~ 328 0
8 V* CS Cha Or* 11 02 24.8849252208 -77 33 35.683462615   12.88 11.69   10.123 K2Ve 205 0
9 Hn 1 Y*O 11 02 32.5992281327 -77 29 13.008552253         13.10 M3+M5 38 0
10 [LES2004] ChaI 424 LM* 11 02 53.74920 -77 22 56.1468           M8.5 6 0
11 ISO-ChaI 13 NIR 11 02 55.792 -77 24 30.41         18.09 ~ 6 0
12 Hn 3 Y*O 11 03 56.8248481185 -77 21 32.994947040   17.05 15.44 15.03 12.57 M4IIIe 29 0
13 CHSM 1715 Y*O 11 04 04.2476748151 -76 39 32.946469603     19.84     M4.5e 22 0
14 CHSM 1982 Y*O 11 04 10.6080493790 -76 12 49.058501690           M6e 14 0
15 CHXR 14N Y*O 11 04 51.0229111739 -76 25 24.078948749   15.98 14.13   11.89 K4Ve 22 0
16 CHXR 14S Y*O 11 04 52.8623059984 -76 25 51.535117807   16.51 14.66   12.05 K8Ve 20 0
17 CHXR 15 Y*O 11 05 42.8798706942 -77 26 51.564304595         13.51 M5+M5 31 0
18 HD 96675 Y*O 11 05 57.8104415475 -76 07 48.883424761   7.82 7.68   8.48 B6IV/V 72 0
19 Ass Cha T 2-21 TT* 11 06 15.3485848381 -77 21 56.737939872   12.58 11.01   9.35 G5Ve 128 0
20 CHXR 73B LM* 11 06 28.49 -77 37 34.2           M9.5+ 30 0
21 CHXR 73 Y*O 11 06 28.7626436677 -77 37 33.144403799         15.78 M3e 44 1
22 CHSM 7869 LM* 11 06 32.7588696676 -76 25 21.063963637         16.83 M6e 18 0
23 V* UX Cha Or* 11 06 45.0955906069 -77 27 02.383778673     14.78   12.07 K5Ve 54 0
24 IRAS 11051-7706 Y*O 11 06 46.025 -77 22 29.67           ~ 73 0
25 [PMG2001] NIR 76 Y*? 11 06 46.580 -77 22 32.56           ~ 55 0
26 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1031 1
27 CHXR 74 TT* 11 06 57.3104472434 -77 42 10.645175426         13.66 M3Ve 42 0
28 IRAS 11057-7706 Y*O 11 07 09.19896 -77 23 04.9920           ~ 59 0
29 Hn 6 Y*O 11 07 11.4517064116 -77 46 39.352554383         13.31 M3e 35 0
30 CHSM 9484 Y*? 11 07 11.8067194913 -76 25 50.011734825         16.07 M5e 19 0
31 [CCE98] 1-46 Y*O 11 07 13.2882531875 -77 43 49.778015603         14.77 M3.5e 40 0
32 CHXR 76 Or* 11 07 35.1777230466 -77 34 49.293344749   20.04 18.15   14.39 M4e 42 0
33 CHXR 26 Y*O 11 07 36.869 -77 33 33.52         15.18 M3.5e 26 0
34 2MASS J11074656-7615174 Y*O 11 07 46.5885434456 -76 15 17.407167200         16.84 M5.75e 26 0
35 RX J1108.2-7728 Y*O 11 07 55.775088 -77 27 25.52724   15.26 13.40 13.07 11.04 K3Ve 52 0
36 V* HM Cha Or* 11 07 57.2859502381 -77 17 26.245693013       20.9 17.14 M0.75-M1.75 35 0
37 CHXR 30A Y*O 11 07 59.9490505190 -77 17 30.542052824   21.8   18.3 15.78 K8 25 0
38 [AKS95b] RX J1108.8-7519a TT* 11 08 49.73 -75 19 41.6           ~ 9 0
39 V* PU Car Ce* 11 08 53.6898995785 -75 21 36.001145506           M1Ve 24 0
40 V* HR Cha Or* 11 08 54.1972544726 -77 32 11.662612572     19.1   15.01 M5.25e 35 0
41 CHX 13 X 11 08 55.7 -76 35 59           M0 19 0
42 HJM C 1-15 Y*O 11 09 13.8184943576 -76 28 39.688945442         13.91 M4Ve 25 0
43 [CCE98] 1-74 TT* 11 09 17.6894816682 -76 27 57.916038219   15.48 13.92   11.72 K4Ve 40 0
44 V* HU Cha Or* 11 09 18.12888 -76 30 29.2500         14.99 M1/2e 47 0
45 CHX 15b Y*O 11 09 40.0554020707 -76 28 39.259268411   15.68 14.04   11.66 K8Ve 34 0
46 HJM C 1-24 TT* 11 09 46.1867409078 -76 34 46.505353388   11.93 18.41   14.72 M3.25e 53 1
47 2MASS J11095262-7740348 Y*? 11 09 52.5590172973 -77 40 34.968785493     21.47     M3e 14 0
48 [PMK99] IR Cha INa4 Y*O 11 10 03.368 -76 33 11.13           M4: 15 0
49 HJM C 1-4 Y*O 11 10 03.6833471517 -76 33 29.222406347     18.78 16.1 14.72 K8e 53 0
50 OTS 44 Y*O 11 10 09.34392 -76 32 17.8512           M9.5+ 53 0
51 CHXX 16 LM* 11 10 22.2510284067 -76 25 13.840839864         16.58 ~ 28 0
52 HJM C 6-2 Y*O 11 10 28.5074803567 -77 16 59.599068546     17.93   13.97 M3Ve 31 0
53 Glass Q Y*O 11 10 37.9009258039 -77 32 39.873598579   16.89 14.97   11.90 K5.5+K7 67 0
54 HJM C 2-5 Y*O 11 10 56.0147051732 -76 45 32.757909031         13.95 M6e 42 0
55 HJM E 1-7 Or* 11 11 34.7529878525 -76 36 21.250012774   16.35 14.73   12.35 K8Ve 30 0
56 CHX 18N TT* 11 11 46.3366412620 -76 20 08.947142071   13.27 11.96   10.37 K5IVe 63 1
57 Hn 15 Y*O 11 11 54.024360 -76 19 30.93132   16.02 14.37 13.98 11.88 M2.5+M3.5 22 1
58 HJM E 1-10 Y*O 11 12 03.2797581554 -76 37 03.244993895         13.97 M5.5e 27 0
59 HJM E 4-3 Y*O 11 12 42.1035695224 -76 58 40.105613409   14.74 13.29 12.98   K5Ve 28 0
60 HJM E 1-8 TT* 11 12 42.9823393023 -76 37 04.866099514         10.95 K3Ve 29 0
61 HJM E 2-9 Y*O 11 12 48.6109499042 -76 47 06.616676741         13.66 M4e 26 0
62 Hn 18 Y*O 11 13 24.4527724500 -76 29 22.875007645         13.51 M4Ve 35 0
63 HJM E 1-4 Y*O 11 13 27.3698112219 -76 34 16.644118218   15.96 14.35   12.10 K8Ve 26 0
64 CHXR 60 X 11 13 28.0 -76 29 10           M4.25 21 0
65 Hn 19 Y*O 11 13 29.6966247744 -76 29 01.382016585         13.42 M4Ve 26 0
66 Hn 20 Y*O 11 14 15.5412946530 -76 27 36.573467035         13.24 M4Ve 25 0
67 Hn 21W Y*O 11 14 24.5185372817 -77 33 06.401221475     18.20   14.24 M4e 29 0
68 Hn 21E Y*O 11 14 26.1053639615 -77 33 04.435007028     20.7   15.47 M6e 12 0
69 CHXR 68B * 11 18 19.5917357145 -76 22 01.436057748   16.46 14.80     M2e 12 0
70 CHXR 68A * 11 18 20.2671732411 -76 21 57.734321272   14.22 12.75 12.51 10.96 K4Ve 18 0
71 IRAS F11171-7919 Y*O 11 18 35.821080 -79 35 54.93624   16.49 15.06 14.99 12.22 M4.75 19 0
72 RX J1123.2-7924 TT* 11 22 55.6424838079 -79 24 44.004919373     13.72     M1.5 16 0
73 2MASS J11291261-7546263 TT* 11 29 12.6353724118 -75 46 26.408578257     12.91     K3Ve 20 0
74 [FLG2003] eps Cha 15 Y*O 11 33 49.2936458918 -76 18 40.058321656         14.08 M4.5 6 0
75 [FLG2003] eps Cha 16 Y*O 11 40 49.6758936384 -74 59 39.247725825         15.02 M5.75 9 0
76 [FLG2003] eps Cha 17 Y*O 11 43 26.6929738153 -78 04 45.469950865         13.33 M5 18 0
77 V* DZ Cha LM* 11 49 31.8520891363 -78 51 01.058647109     12.832   10.732 M0Ve 67 0
78 RX J1150.4-7704 TT* 11 50 28.3020693049 -77 04 38.244495921     12.0   10.54 K4 23 0
79 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 721 0
80 [FLG2003] eps Cha 20 TT* 11 58 26.8118541887 -77 54 45.268534759   15.85 14.29     M3Ve 18 0
81 V* DW Cha Ro* 11 58 28.1599177302 -77 54 29.528939536   11.63 10.502   9.011 K4Ve 43 1
82 NAME eps Cha Association OpC 11 59 51 -78 12.4           ~ 134 1
83 V* DX Cha Ae* 12 00 05.0870448690 -78 11 34.559255151   6.81 6.60     A0_sh 315 0
84 NAME Cha II MoC 12 54 -77.2           ~ 309 0
85 NAME Lup Cloud SFR 16 03 -38.1           ~ 576 0
86 NAME Upper Sco Association As* 16 12 -23.4           ~ 1129 1
87 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 986 2
88 IC 1396 OpC 21 39 00 +57 29.4           ~ 453 1
89 NGC 7160 OpC 21 53 40 +62 36.2   6.34 6.1     ~ 214 0

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2021.10.24-05:37:55

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