2017ApJ...846...70P


Query : 2017ApJ...846...70P

2017ApJ...846...70P - Astrophys. J., 846, 70-70 (2017/September-1)

Millimeter spectral indices and dust trapping by planets in brown dwarf disks.

PINILLA P., QUIROGA-NUNEZ L.H., BENISTY M., NATTA A., RICCI L., HENNING T., VAN DER PLAS G., BIRNSTIEL T., TESTI L. and WARD-DUONG K.

Abstract (from CDS):

Disks around brown dwarfs (BDs) are excellent laboratories to study the first steps of planet formation in cold and low-mass disk conditions. The radial-drift velocities of dust particles in BD disks higher than in disks around more massive stars. Therefore, BD disks are expected to be more depleted in millimeter-sized grains compared to disks around T Tauri or Herbig Ae/Be stars. However, recent millimeter observations of BD disks revealed low millimeter spectral indices, indicating the presence of large grains in these disks and challenging models of dust evolution. We present 3 mm photometric observations carried out with the IRAM/Plateau de Bure Interferometer (PdBI) of three BD disks in the Taurus star-forming region, which have been observed with ALMA at 0.89 mm. The disks were not resolved and only one was detected with enough confidence (∼3.5σ) with PdBI. Based on these observations, we obtain the values and lower limits of the spectral index and find low values (αmm <= 3.0). We compare these observations in the context of particle trapping by an embedded planet, a promising mechanism to explain the observational signatures in more massive and warmer disks. We find, however, that this model cannot reproduce the current millimeter observations for BD disks, and multiple-strong pressure bumps globally distributed in the disk remain as a favorable scenario to explain observations. Alternative possibilities are that the gas masses in the BD disk are very low (∼2 x 10–3 MJup) such that the millimeter grains are decoupled and do not drift, or fast growth of fluffy aggregates.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): brown dwarfs - circumstellar matter - planets and satellites: formation - protoplanetary disks - protoplanetary disks

Simbad objects: 12

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Number of rows : 12
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 IC 348 OpC 03 44 34 +32 09.8           ~ 1260 1
2 V* HL Tau Or* 04 31 38.471952 +18 13 58.08504   15.89 14.49 14.39   K5 1271 0
3 ITG 3 Y*O 04 38 14.8833303682 +26 11 39.971794234       20.33 17.84 M7e 54 0
4 2MASS J04390396+2544264 Y*O 04 39 03.9603916514 +25 44 26.337817736       18.40 15.40 M7IVe 53 0
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3747 0
6 2MASS J04414825+2534304 Y*O 04 41 48.2522895943 +25 34 30.569106360         17.03 M8e 49 0
7 M 42 HII 05 35 17.3 -05 23 28           ~ 3818 0
8 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1023 1
9 TWA 27 LM* 12 07 33.4676156527 -39 32 54.016042897     19.95 17.99 15.88 M8IVe 316 0
10 [GY92] 204 TT* 16 27 06.5924723987 -24 41 48.883697790       17.57 15.43 M5 86 0
11 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3199 1
12 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 732 0

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2021.08.02-14:26:09

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