2004A&A...426L..53A


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.17CEST12:27:33

2004A&A...426L..53A - Astronomy and Astrophysics, volume 426, L53-57 (2004/11-2)

Grain growth and dust settling in a brown dwarf disk. Gemini/T-ReCS observations of CFHT-BD-Tau 4.

APAI D., PASCUCCI I., STERZIK M.F., VAN DER BLIEK N., BOUWMAN J., DULLEMOND C.P. and HENNING T.

Abstract (from CDS):

We present accurate mid-infrared observations of the disk around the young, bona fide brown dwarf CFHT-BD-Tau 4. We report GEMINI/T-ReCS measurements in the 7.9, 10.4 and 12.3µm filters, from which we infer the presence of a prominent, broad silicate emission feature. The shape of the silicate feature is dominated by emission from 2µm amorphous olivine grains. Such grains, being an order of magnitude larger than those in the interstellar medium, are a first proof of dust processing and grain growth in disks around brown dwarfs. The object's spectral energy distribution is below the prediction of the classical flared disk model but higher than that of the two-layer flat disk. A good match can be achieved by using an intermediate disk model with strongly reduced but non-zero flaring. Grain growth and dust settling processes provide a natural explanation for this disk geometry and we argue that such intermediate flaring might explain the observations of several other brown dwarf disks as well.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - circumstellar matter - planetary systems: protoplanetary disks stars: individual: CFHT-BD-Tau 4 - stars: low-mass, dwarfs brown - stars: pre-main sequence

Simbad objects: 6

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Number of rows : 6

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 ITG 17 Y*O 04 39 47.4820305505 +26 01 40.693626234     21.556   15.78 M7 87 0
2 V* HK Cha Or* 11 07 42.3440888366 -77 33 59.381952754   21.9 19.8   15.26 ~ 76 0
3 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 673 1
4 V* DX Cha Ae* 12 00 05.0870448690 -78 11 34.559255151   6.81 6.60     A0_sh 312 0
5 [GY92] 5 Y*O 16 26 21.5389368381 -24 26 01.000528521       18.30 15.80 M7 63 1
6 [GY92] 310 Y*O 16 27 38.6280925403 -24 38 39.230714152         17.40 M8 63 0

    Equat.    Gal    SGal    Ecl

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2021.04.17-12:27:33

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