2013A&A...559A.126A


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.21CET10:55:51

2013A&A...559A.126A - Astronomy and Astrophysics, volume 559A, 126-126 (2013/11-1)

Herschel survey of brown dwarf disks in ρ Ophiuchi.

ALVES DE OLIVEIRA C., ABRAHAM P., MARTON G., PINTE C., KISS CS., KUN M., KOSPAL A., ANDRE P. and KOENYVES V.

Abstract (from CDS):

Young brown dwarfs are known to possess circumstellar disks, a characteristic that is fundamental to the understanding of their formation process, and raises the possibility that these objects harbour planets. We want to characterise the far-IR emission of disks around the young brown dwarf population of the ρ Ophiuchi cluster in LDN 1688. Recent observations of the ρ Ophiuchi cluster with the Herschel Space Observatory allow us to probe the spectral energy distribution (SED) of the brown dwarf population in the far-IR, where the disk emission peaks. We performed aperture photometry at 70, 100, and 160µm, and constructed SEDs for all previously known brown dwarfs detected. These were complemented with ancillary photometry at shorter wavelengths. We compared the observed SEDs to a grid of synthetic disks produced with the radiative transfer code MCFOST, and used the relative figure of merit estimated from the Bayesian inference of each disk parameter to analyse the structural properties. We detected 12 Class II brown dwarfs with Herschel, which corresponds to one-third of all currently known brown dwarf members of ρ Ophiuchi. We did not detect any of the known Class III brown dwarfs. Comparison to models reveals that the disks are best described by an inner radius between 0.01 and 0.07AU, and a flared disk geometry with a flaring index between 1.05 and 1.2. Furthermore, we can exclude values of the disk scale-height lower than 10AU (measured at a fiducial radius of 100AU). We combined the Herschel data with recent ALMA observations of the brown dwarf GY92 204 (ISO-Oph 102), and by comparing its SED to the same grid of disk models, we derived an inner disk radius of 0.035AU, a scale height of 15AU with a flaring index of β∼1.15, an exponent for dust settling of -1.5, and a disk mass of 0.001M. This corresponds to a disk-to-central object mass ratio of ∼1%. The structural parameters constrained by the extended SED coverage (inner radius and flaring index) show a narrow distribution for the young brown dwarfs detected in ρ Ophiuchi, suggesting that these objects share the same disk evolution and, perhaps, formation.

Abstract Copyright:

Journal keyword(s): brown dwarfs - accretion, accretion disks

Simbad objects: 51

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Number of rows : 51

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 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3374 0
2 IRAS S04414+2506 BD* 04 44 27.1421731772 +25 12 16.439761677           M7e 59 0
3 NAME TW Hya Association As* 11 01.9 -34 42           ~ 802 0
4 NAME Cha II MoC 12 54 -77.2           ~ 295 0
5 [PB95] Oph B 11 PoC 16 24 12.9 -24 26 06           ~ 17 0
6 BKLT J162532-243404 BD? 16 25 32.4204176852 -24 34 05.015150400           M6.5 7 0
7 SONYC RhoOph-7 BD* 16 26 03.28 -24 30 25.9           L0 6 0
8 BKLT J162618-242951 Y*O 16 26 18.58104 -24 29 51.4860           M6.75 14 0
9 CRBR 2317.3-1925 Y*O 16 26 18.82056 -24 26 10.5216           M7 39 0
10 CFHTWIR-Oph 18 BD* 16 26 19.40880 -24 27 43.7976           L0 5 0
11 [GY92] 3 Y*O 16 26 21.9083577172 -24 44 39.720788042       17.95 15.62 M6.5 44 0
12 NAME rho Oph Cluster Cl* 16 26 22 -24 23.7           ~ 46 0
13 [RR90] Oph 2320.8-1721 Y*O 16 26 22.26912 -24 24 07.0632           M8 63 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 [GY92] 64 Y*O 16 26 32.52576 -24 26 35.4480           ~ 20 0
17 CFHTWIR-Oph 33 BD* 16 26 39.68520 -24 22 06.0924           L4 7 0
18 [GY92] 90 Y*O 16 26 39.91704 -24 22 33.4272           M8.25 15 0
19 [GY92] 109 Y*O 16 26 42.89280 -24 22 59.0808           ~ 18 1
20 [RR90] Oph 2349.8-2601 Y*O 16 26 51.2908889493 -24 32 42.017741452           M8.5 47 0
21 2MASS J16265226-2401466 BD? 16 26 52.260 -24 01 46.70           M7.5 4 0
22 [GY92] 154 Y*O 16 26 54.77088 -24 27 02.2464           ~ 22 0
23 SONYC RhoOph-1 BD? 16 26 56.33520 -24 42 37.7244           ~ 7 0
24 WL 21 TT* 16 26 57.33000 -24 35 38.8032           ~ 40 0
25 YLW 1C Y*O 16 26 58.39608 -24 21 29.9808           ~ 31 1
26 2MASS J16270402-2402467 BD? 16 27 04.0216962546 -24 02 47.127579958           M7.25 4 0
27 SONYC RhoOph-6 BD* 16 27 05.92680 -24 18 40.2156           L3 10 0
28 BBRCG 21 Y*O 16 27 05.97624 -24 28 36.3252           ~ 34 0
29 [GY92] 204 Y*O 16 27 06.5924723987 -24 41 48.883697790       17.57 15.43 M5 79 0
30 [RR90] Oph 2412.9-2447 Y*O 16 27 14.34048 -24 31 31.9260           M4.5 10 0
31 CFHTWIR-Oph 77 BD* 16 27 25.64400 -24 37 28.5168           M7 7 0
32 BKLT J162726-241925 Y*O 16 27 26.22336 -24 19 22.9980           M7.75 25 0
33 [GY92] 264 TT* 16 27 26.5817762470 -24 25 54.393628119       17.90 15.72 M8 36 0
34 BKLT J162736-245134 BD* 16 27 36.61152 -24 51 36.0900           L0 8 0
35 BKLT J162737-241756 Y*O 16 27 37.4272403427 -24 17 54.955552302           M7.5 24 0
36 [GY92] 310 Y*O 16 27 38.6280925403 -24 38 39.230714152         17.40 M8 59 0
37 [GY92] 320 Y*O 16 27 40.8482069443 -24 29 00.786855105           M7.75 17 0
38 2MASS J16274422-2358521 BD? 16 27 44.226 -23 58 52.14           M9.75 4 0
39 [GY92] 344 Y*O 16 27 45.78672 -24 44 53.8620           ~ 27 0
40 [GY92] 350 Y*O 16 27 46.2918321741 -24 31 41.264641200           M7.5 34 0
41 CFHTWIR-Oph 100 BD* 16 27 46.54 -24 05 59.2           L0 3 0
42 2MASS J16274725-2446458 BD? 16 27 47.258 -24 46 45.83           M7 5 0
43 [GY92] 371 Y*O 16 27 49.7891400099 -24 25 21.930904732           ~ 28 0
44 [GY92] 397 Y*O 16 27 55.25496 -24 28 39.5580           ~ 23 0
45 [GY92] 450 Y*O 16 28 03.55560 -24 34 38.6148           ~ 14 0
46 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2971 0
47 BKLT J162810-242421 BD* 16 28 10.45080 -24 24 20.0700           L0 6 0
48 BKLT J162812-241138 Y*O 16 28 12.7237256177 -24 11 35.723756180           M6 25 0
49 BKLT J162830-245403 Y*? 16 28 29.9230235887 -24 54 06.359460798           M6.5 9 0
50 BKLT J162848-242631 BD? 16 28 48.7135557721 -24 26 31.709654950           M6.25 9 0
51 NAME Oph Cluster ClG 17 12 24.7 -23 21 01           ~ 235 0

    Equat.    Gal    SGal    Ecl

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2020.02.21-10:55:51

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