2016A&A...593A.111T


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.29CEST03:18:16

2016A&A...593A.111T - Astronomy and Astrophysics, volume 593A, 111-111 (2016/9-1)

Brown dwarf disks with ALMA: Evidence for truncated dust disks in Ophiuchus.

TESTI L., NATTA A., SCHOLZ A., TAZZARI M., RICCI L. and DE GREGORIO MONSALVO I.

Abstract (from CDS):

Context. The study of the properties of disks around young brown dwarfs can provide important clues on the formation of these very low-mass objects and on the possibility of forming planetary systems around them. The presence of warm dusty disks around brown dwarfs is well known, based on near- and mid-infrared studies.
Aims. High angular resolution observations of the cold outer disk are limited; we used ALMA to attempt a first survey of young brown dwarfs in the ρ Oph star-forming region.
Methods. All 17 young brown dwarfs in our sample were observed at 890µm in the continuum at 0.5 angular resolution. The sensitivity of our observations was chosen to detect ∼0.5M of dust.
Results. We detect continuum emission in 11 disks (∼65% of the total), and the estimated mass of dust in the detected disks ranges from ∼0.5 to ∼6M. These disk masses imply that planet formation around brown dwarfs may be relatively rare and that the supra-Jupiter mass companions found around some brown dwarfs are probably the result of a binary system formation. We find evidence that the two brightest disks in ρ Oph have sharp outer edges at R≥25AU, in contrast to disks around Taurus brown dwarfs. This difference may suggest that the different environment in ρ Oph may lead to significant differences in disk properties. A comparison of the Mdisk/M* ratio for brown dwarf and solar-mass systems also shows a possible deficit of mass in brown dwarfs, which could support the evidence for dynamical truncation of disks in the substellar regime. These findings are still tentative and need to be put on firmer grounds by studying the gaseous disks around brown dwarfs and by performing a more systematic and unbiased survey of the disk population around the more massive stars.

Abstract Copyright: © ESO, 2016

Journal keyword(s): protoplanetary disks - brown dwarfs - stars: formation - submillimeter: planetary systems

Status at CDS:  

Simbad objects: 27

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Number of rows : 27

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 ITG 17 Y*O 04 39 47.4820305505 +26 01 40.693626234     21.556   15.78 M7 84 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3444 0
3 IRAS S04414+2506 BD* 04 44 27.1421731772 +25 12 16.439761677           M7e 60 0
4 QSO B1514-24 BLL 15 17 41.8135246339 -24 22 19.482167214   15.13 14.00 13.95   ~ 640 3
5 NAME Upper Sco Association As* 16 12 -23.4           ~ 1010 1
6 NOVA Sco 1863 No* 16 22 30.7782086963 -17 52 43.162570042   8.80 8.70     F8+K2 463 0
7 QSO B1622-253 QSO 16 25 46.89164010 -25 27 38.3267989   21.3 20.6 19.60   ~ 298 1
8 QSO B1622-297 QSO 16 26 06.02083867 -29 51 26.9710860   18.41 20.5 17.6   ~ 361 0
9 BKLT J162618-242951 Y*O 16 26 18.58104 -24 29 51.4860           M6.75 14 0
10 CRBR 2317.3-1925 Y*O 16 26 18.82056 -24 26 10.5216           M7 40 0
11 [GY92] 5 Y*O 16 26 21.5389368381 -24 26 01.000528521       18.30 15.80 M7 59 1
12 [GY92] 3 Y*O 16 26 21.9083577172 -24 44 39.720788042       17.95 15.62 M6.5 45 0
13 [RR90] Oph 2320.8-1721 Y*O 16 26 22.26912 -24 24 07.0632           M8 64 0
14 [GY92] 15 Y*O 16 26 22.95576 -24 28 46.1496           ~ 22 0
15 CRBR 2322.3-1143 Y*O 16 26 23.81424 -24 18 29.0016           ~ 22 0
16 VSSG 29 Y*O 16 26 27.8166288668 -24 26 41.866584968         17.85 M5 36 1
17 BBRCG 21 Y*O 16 27 05.97624 -24 28 36.3252           ~ 35 0
18 [GY92] 204 Y*O 16 27 06.5924723987 -24 41 48.883697790       17.57 15.43 M5 81 0
19 BKLT J162726-241925 Y*O 16 27 26.22336 -24 19 22.9980           M7.75 26 0
20 [GY92] 264 TT* 16 27 26.5817762470 -24 25 54.393628119       17.90 15.72 M8 37 0
21 BKLT J162737-241756 Y*O 16 27 37.4272403427 -24 17 54.955552302           M7.5 25 0
22 [GY92] 310 Y*O 16 27 38.6280925403 -24 38 39.230714152         17.40 M8 60 0
23 [GY92] 320 Y*O 16 27 40.8482069443 -24 29 00.786855105           M7.75 18 0
24 [GY92] 350 Y*O 16 27 46.2918321741 -24 31 41.264641200           M7.5 35 0
25 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3006 0
26 BKLT J162812-241138 Y*O 16 28 12.7237256177 -24 11 35.723756180           M6 26 0
27 QSO B1730-130 QSO 17 33 02.70578476 -13 04 49.5481484   18 18.5 18.78 17.39 ~ 976 1

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2020.05.29-03:18:16

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