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


Query : 2013A&A...559A.126A

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 - 2023
#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4094 0
2 IRAS S04414+2506 BD* 04 44 27.1429754400 +25 12 16.434936000           M7e 73 0
3 NAME TW Hya Association As* 11 01.9 -34 42           ~ 907 0
4 NAME Cha II MoC 12 54 -77.2           ~ 321 0
5 [PB95] Oph B 11 PoC 16 24 12.9 -24 26 06           ~ 19 0
6 BKLT J162532-243404 LM* 16 25 32.4211514208 -24 34 05.046026628           M6.5 8 0
7 SONYC RhoOph-7 BD* 16 26 03.28 -24 30 25.9           L0 8 0
8 BKLT J162618-242951 LM* 16 26 18.58104 -24 29 51.4860           M6.75 19 0
9 CRBR 2317.3-1925 Y*O 16 26 18.82056 -24 26 10.5216           M7 45 0
10 CFHTWIR-Oph 18 BD* 16 26 19.40880 -24 27 43.7976           L0 6 0
11 [GY92] 3 Y*O 16 26 21.9078410496 -24 44 39.697627344       17.95 15.62 M6.5 53 0
12 NAME rho Oph Cluster Cl* 16 26 22 -24 23.7           ~ 63 0
13 [RR90] Oph 2320.8-1721 Y*O 16 26 22.26912 -24 24 07.0632           M8 70 0
14 [GY92] 15 Y*O 16 26 22.95576 -24 28 46.1496           M6 25 0
15 CRBR 2322.3-1143 Y*O 16 26 23.81424 -24 18 29.0016           M6.7 25 0
16 [GY92] 64 Y*O 16 26 32.52576 -24 26 35.4480           M8 23 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 18 0
19 [GY92] 109 Y*O 16 26 42.89280 -24 22 59.0808           M6 19 0
20 [RR90] Oph 2349.8-2601 Y*O 16 26 51.2924609616 -24 32 42.001375272           M8.5 52 0
21 2MASS J16265226-2401466 LM* 16 26 52.260 -24 01 46.70           M7.5 5 0
22 [GY92] 154 Y*O 16 26 54.77088 -24 27 02.2464           M6 25 0
23 SONYC RhoOph-1 BD* 16 26 56.33520 -24 42 37.7244           L0 8 0
24 WL 21 Y*O 16 26 57.33000 -24 35 38.8032           M6 43 0
25 YLW 1C Or* 16 26 58.39608 -24 21 29.9808           M6 33 0
26 CFHTWIR-Oph 57 LM* 16 27 04.0204966776 -24 02 47.127727500           M7.25 4 0
27 SONYC RhoOph-6 BD* 16 27 05.92680 -24 18 40.2156           L3? 13 0
28 BBRCG 21 Y*O 16 27 05.97624 -24 28 36.3252           M7 39 0
29 [GY92] 204 TT* 16 27 06.5924837856 -24 41 48.871282992       17.57 15.43 M5 93 0
30 [RR90] Oph 2412.9-2447 Y*O 16 27 14.34048 -24 31 31.9260           M7.75 12 0
31 CFHTWIR-Oph 77 LM* 16 27 25.64400 -24 37 28.5168           M9.75 9 0
32 BKLT J162726-241925 Y*O 16 27 26.22336 -24 19 22.9980           M7.75 29 0
33 [GY92] 264 TT* 16 27 26.5812811008 -24 25 54.395321448       17.90 15.72 M8 44 0
34 BKLT J162736-245134 BD* 16 27 36.61152 -24 51 36.0900           L0 13 0
35 BKLT J162737-241756 Y*O 16 27 37.4277519528 -24 17 54.924640440           M7.5 30 0
36 [GY92] 310 Y*O 16 27 38.6295993720 -24 38 39.214842072         17.40 M8 66 0
37 [GY92] 320 LM* 16 27 40.8466548528 -24 29 00.785382684           M7.75 24 0
38 CFHTWIR-Oph 98 LM* 16 27 44.226 -23 58 52.14           M9.75 8 0
39 [GY92] 344 Y*O 16 27 45.78672 -24 44 53.8620           M6 29 0
40 [GY92] 350 Y*O 16 27 46.2923939352 -24 31 41.243157372           M7.5 40 0
41 CFHTWIR-Oph 100 BD* 16 27 46.54902 -24 05 59.0647           L0 4 0
42 2MASS J16274725-2446458 LM* 16 27 47.25816 -24 46 45.8256           M7 5 0
43 [GY92] 371 Y*O 16 27 49.7891400099 -24 25 21.930904732           M6 31 0
44 [GY92] 397 Y*O 16 27 55.25496 -24 28 39.5580           M6 27 0
45 [GY92] 450 Y*O 16 28 03.55560 -24 34 38.6148           M6 14 0
46 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3446 1
47 BKLT J162810-242421 BD* 16 28 10.45080 -24 24 20.0700           L0 9 0
48 BKLT J162812-241138 Y*O 16 28 12.7235398560 -24 11 35.716712676           M6 32 0
49 BKLT J162830-245403 LM* 16 28 29.9242568088 -24 54 06.361602084           M6.5 10 0
50 BKLT J162848-242631 LM* 16 28 48.7135089240 -24 26 31.708697712           M6.25 14 0
51 NAME Oph Cluster ClG 17 12 24.7 -23 21 01           ~ 262 0

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2023.01.30-21:57:16

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