2007ApJ...670.1337D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST15:39:54

2007ApJ...670.1337D - Astrophys. J., 670, 1337-1346 (2007/December-1)

A comprehensive view of circumstellar disks in Chamaeleon I: infrared excess, accretion signatures, and binarity.

DAMJANOV I., JAYAWARDHANA R., SCHOLZ A., AHMIC M., NGUYEN D.C., BRANDEKER A. and VAN KERKWIJK M.H.

Abstract (from CDS):

We present a comprehensive study of disks around 81 young, low-mass stars and brown dwarfs in the nearby ∼2 Myr old Chamaeleon I star-forming region. We use mid-infrared photometry from the Spitzer Space Telescope, supplemented by findings from ground-based high-resolution optical spectroscopy and adaptive optics imaging. We derive disk fractions of 52%±6% and 58+6–7% based on 8 and 24 µm color excesses, respectively, consistent with those reported for other clusters of similar age. Within the uncertainties, the disk frequency in our sample of K3-M8 objects in Cha I does not depend on stellar mass. Diskless and disk-bearing objects have similar spatial distributions. There are no obvious transition disks in our sample, implying a rapid timescale for the inner disk clearing process; however, we find two objects with weak excess at 3-8 µm and substantial excess at 24 µm, which may indicate grain growth and dust settling in the inner disk. For a subsample of 35 objects with high-resolution spectra, we investigate the connection between accretion signatures and dusty disks: in the vast majority of cases (29/35) the two are well correlated, suggesting that, on average, the timescale for gas dissipation is similar to that for clearing the inner dust disk. The exceptions are six objects for which dust disks appear to persist even though accretion has ceased or dropped below measurable levels. Adaptive optics images of 65 of our targets reveal that 17 have companions at (projected) separations of 10-80 AU. Of the five ≲20 AU binaries, four lack infrared excess, possibly indicating that a close companion leads to faster disk dispersal. The closest binary with excess is separated by ∼20 AU, which sets an upper limit of ∼8 AU for the outer disk radius. The overall disk frequency among stars with companions (35+15–13%) is lower than (but still statistically consistent with) the value for the total sample.

Abstract Copyright:

Journal keyword(s): Accretion, Accretion Disks - Stars: Binaries: General - Stars: Circumstellar Matter - Stars: Planetary Systems - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 92

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Number of rows : 92

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 348 OpC 03 44 34 +32 09.8           ~ 1227 1
2 NAME TW Hya Association As* 11 01.9 -34 42           ~ 819 0
3 ISO-ChaI 28 Y*O 11 03 41.8506531591 -77 26 52.113632297           M5.5e 17 0
4 V* GR Cha Or* 11 03 47.6444437349 -77 19 56.421700753         13.91 M5e 24 0
5 Hn 3 Y*O 11 03 56.8248481185 -77 21 32.994947040   17.05 15.44 15.03 12.57 M4IIIe 27 0
6 BYB 18 Y*O 11 04 42.5993743243 -77 41 57.172118661         13.63 M4.5e 50 0
7 Sz 13 Or* 11 04 57.0098115161 -77 15 57.051233669     18.91 16.65 14.68 M3e 37 0
8 Hn 4 Y*O 11 05 14.5496059237 -77 11 29.219513274         13.20 M4+M3 24 0
9 CHXR 15 Y*O 11 05 42.8798706942 -77 26 51.564304595         13.51 M5+M5 31 0
10 Ass Cha T 2-21 TT* 11 06 15.3485848381 -77 21 56.737939872   12.58 11.01   9.35 G5Ve 123 0
11 [CCE98] 2-19 Y*O 11 06 15.4367164700 -77 37 50.161995540         16.40 M3e 15 0
12 CHXR 73 Y*O 11 06 28.7626436677 -77 37 33.144403799         15.78 M3e 42 1
13 [NC98] Cha HA 12 Em* 11 06 37.9644089837 -77 43 09.114902996     20.6   15.91 M6.5e 37 0
14 ISO-ChaI 79 pr* 11 06 39.4494750569 -77 36 05.243613520         17.83 M5e 24 0
15 Hn 5 Or* 11 06 41.7898286101 -76 35 49.064605354         13.61 M4.5e 39 0
16 Ass Cha T 2-22 Y*O 11 06 43.4643282637 -77 26 34.439892844         13.02 M3e 33 0
17 V* UX Cha Or* 11 06 45.0955906069 -77 27 02.383778673     14.78   12.07 K5Ve 53 0
18 IRAS 11051-7706 Y*O 11 06 46.025 -77 22 29.67           ~ 71 0
19 [PMG2001] NIR 76 Y*? 11 06 46.580 -77 22 32.56           ~ 55 0
20 NAME Cha I MoC 11 06 48 -77 18.0           ~ 968 1
21 CHXR 74 TT* 11 06 57.3104472434 -77 42 10.645175426         13.66 M3Ve 42 0
22 V* UY Cha Or* 11 06 59.0259228302 -77 18 53.406348011         12.97 M4Ve 55 0
23 IRAS 11057-7706 Y*O 11 07 09.19896 -77 23 04.9920           ~ 59 0
24 [CCE98] 2-21 Y*O 11 07 09.25152 -77 18 47.1420           M2.5 23 0
25 CHSM 9484 Y*? 11 07 11.8067194913 -76 25 50.011734825         16.07 M5e 19 0
26 V* UZ Cha Or* 11 07 12.0599793783 -76 32 23.245866021         12.62 K8Ve 50 0
27 [CCE98] 1-46 Y*O 11 07 13.2882531875 -77 43 49.778015603         14.77 M3.5e 40 0
28 [NC98] Cha HA 1 Y*O 11 07 16.6694944374 -77 35 53.222755937   22.8 21.0   16.38 M7.5/8e 82 0
29 [NC98] Cha HA 9 BD* 11 07 18.5742862738 -77 32 51.553842979     23.1   17.57 M5.5e 48 0
30 [CCE98] 2-24 Y*O 11 07 21.426 -77 22 11.76           M2 33 0
31 CHXR 76 Or* 11 07 35.1777230466 -77 34 49.293344749   20.04 18.15   14.39 M4e 41 0
32 CHXR 26 Y*O 11 07 36.869 -77 33 33.52         15.18 M3.5e 26 0
33 CHSM 10496 Em* 11 07 37.7397076094 -77 35 30.798281267   23.7 22.2   17.03 ~ 38 0
34 V* HK Cha Or* 11 07 42.3440888366 -77 33 59.381952754   21.9 19.8   15.26 ~ 76 0
35 Glass H Y*O 11 07 55.887 -77 27 25.75   15.30 13.49   11.04 K3Ve 52 0
36 HD 97048 Ae* 11 08 03.3105687971 -77 39 17.491180130 9.03 8.76 9.00   8.64 A0Vep 458 0
37 Ass Cha T 1-19 Y*O 11 08 16.4935782089 -77 44 37.208594822   18.40 16.53   13.12 M4Ve 47 0
38 ISO-ChaI 137 Em* 11 08 17.0488242221 -77 44 11.882363175   20.4 18.51   14.34 M5.5e 24 0
39 ISO-ChaI 143 Y*? 11 08 22.3644100400 -77 30 27.790600663         15.51 M5e 39 0
40 ISO-ChaI 147 Y*? 11 08 26.4689399244 -77 15 55.081276798         16.81 M5.75 23 0
41 Ass Cha T 1-20 Or* 11 08 39.0278260669 -77 16 04.168315197   18.44 16.28 15.822 13.17 K5Ve 76 0
42 V* HQ Cha Or* 11 08 39.5016839836 -77 34 16.747297668   21.7 19.75   15.06 ~ 60 0
43 Sz 28 pr* 11 08 50.9082136997 -76 25 13.683233652   16.4     14.60 M4Ve 32 0
44 V* HR Cha Or* 11 08 54.1972544726 -77 32 11.662612572     19.1   15.01 M5.25e 34 0
45 V* HS Cha Or* 11 08 54.9596817049 -76 32 41.150823907     20.12 18.616 16.650 M5.5e 30 0
46 CHX 13 X 11 08 55.7 -76 35 59           M0 19 0
47 Sz 30 TT* 11 09 11.72304 -77 29 12.4836   14.89 13.28 13.02 11.032 M2.5+M2 50 0
48 HJM C 1-15 pr* 11 09 13.8184943576 -76 28 39.688945442         13.91 M4Ve 25 0
49 [CCE98] 1-74 TT* 11 09 17.6894816682 -76 27 57.916038219   15.48 13.92   11.72 K4Ve 40 0
50 V* HU Cha Or* 11 09 18.12888 -76 30 29.2500         14.99 M1/2e 47 0
51 V* VZ Cha Or* 11 09 23.7736314968 -76 23 20.855918834   13.82 12.94   12.14 K7e 124 0
52 CHX 15b pr* 11 09 40.0554020707 -76 28 39.259268411   15.68 14.04   11.66 K8Ve 33 0
53 HJM C 7-1 Y*O 11 09 42.5581655835 -77 25 57.930317904         15.91 ~ 33 0
54 BYB 43 Y*O 11 09 47.3857825572 -77 26 29.196716064         16.62 M3.25e 44 0
55 2MASS J11094866-7714383 Y*O 11 09 48.67 -77 14 38.3           M1 10 0
56 [KG2001] 102 Y*O 11 09 49.1459702022 -77 31 19.759411980         15.64 M5.5 14 0
57 HD 97300 Ae* 11 09 50.0178181814 -76 36 47.711452436   9.41 9.20   8.82 B9V 157 1
58 ISO-ChaI 217 pr* 11 09 52.1370847465 -76 39 12.880114192         16.63 ~ 42 0
59 2MASS J11095262-7740348 Y*? 11 09 52.5590172973 -77 40 34.968785493     21.47     M3e 13 0
60 ISO-ChaI 220 Y*O 11 09 53.3256952909 -77 28 36.636877998           M5.75 26 0
61 V* HX Cha Or* 11 09 54.062760 -76 29 25.54332       16.08 14.03 M3.5+M7 62 0
62 V* HY Cha Or* 11 09 54.3715732403 -76 31 11.425347874     21.6   17.27 M1.75e 26 0
63 V* WX Cha Or* 11 09 58.666944 -77 37 09.03432   14.93 13.85 14.23 12.20 M1+M5 90 0
64 V* WY Cha Or* 11 10 07.0323174364 -76 29 37.640377806   15.29 13.87   11.62 K8Ve 79 1
65 2MASS J11100785-7727480 Y*? 11 10 07.8409195036 -77 27 48.070710758         17.79 M5.5 29 0
66 CHXX 16 LM* 11 10 22.2510284067 -76 25 13.840839864         16.58 ~ 28 0
67 HJM C 6-2 Y*O 11 10 28.5074803567 -77 16 59.599068546     17.93   13.97 M3Ve 29 0
68 [LES2004] ChaI 405 TT* 11 10 34.7900577915 -77 22 05.254117743     20.9   15.61 M4 17 0
69 ISO-ChaI 250 LM* 11 10 36.4169296509 -77 22 13.101624548         16.52 M4.75 18 0
70 Glass Q Y*O 11 10 37.9009258039 -77 32 39.873598579   16.89 14.97   11.90 K5.5+K7 67 0
71 ISO-ChaI 252 Y*? 11 10 41.3837182099 -77 20 47.962681310     22.4 20.06 17.27 ~ 32 0
72 V* IK Cha Or* 11 10 53.5826928495 -77 25 00.473687651         17.51 M4.5 28 0
73 HJM C 2-5 pr* 11 10 56.0147051732 -76 45 32.757909031         13.95 M6e 42 0
74 HJM E 1-7 Or* 11 11 34.7529878525 -76 36 21.250012774   16.35 14.73   12.35 K8Ve 29 0
75 V* XX Cha Or* 11 11 39.6733333784 -76 20 15.037536625   16.67 15.28   12.56 M3Ve 97 1
76 CHX 18N TT* 11 11 46.3366412620 -76 20 08.947142071   13.27 11.96   10.37 K5IVe 60 1
77 CHX 18 X 11 11 49.8 -76 19 48           ~ 61 1
78 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
79 HJM E 1-10 pr* 11 12 03.2797581554 -76 37 03.244993895         13.97 M5.5e 27 0
80 V* IM Cha Or* 11 12 03.5022968628 -77 26 00.846650924     20.08     M4.75 28 0
81 Sz 40 Or* 11 12 09.8315145785 -76 34 36.496433593   15.2     13.41 M4.5Ve 52 0
82 Sz 41 TT* 11 12 24.3971939698 -76 37 06.179976409   11.2 11.60   10.22 K7+M2.5 91 1
83 HJM E 1-8 TT* 11 12 42.9823393023 -76 37 04.866099514         10.95 K3Ve 29 0
84 Hn 18 Y*O 11 13 24.4527724500 -76 29 22.875007645         13.51 M4Ve 35 0
85 HJM E 1-4 Y*O 11 13 27.3698112219 -76 34 16.644118218   15.96 14.35   12.10 K8Ve 26 0
86 CHXR 60 X 11 13 28.0 -76 29 10           M4.25 21 0
87 Hn 19 Y*O 11 13 29.6966247744 -76 29 01.382016585         13.42 M4Ve 26 0
88 Sz 44 Or* 11 13 33.5605868629 -76 35 37.465480024   15.4     13.59 M4Ve 29 0
89 Hn 20 Y*O 11 14 15.5412946530 -76 27 36.573467035         13.24 M4Ve 25 0
90 NAME Upper Sco Association As* 16 12 -23.4           ~ 1021 1
91 IC 1396 OpC 21 39 00 +57 29.4           ~ 445 1
92 NGC 7160 OpC 21 53 40 +62 36.2   6.34 6.1     ~ 208 0

    Equat.    Gal    SGal    Ecl

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2020.07.12-15:39:54

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