Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-14
Astron.Astrophys. 426 (2004) L53-L57
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy & Astrophysics Letters, 4.5 pages with 1 figure
Scientific paper
10.1051/0004-6361:200400080
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 12.3 micron 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 2 micron 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.
Apai Daniel
Bouwman Jeroen
Dullemond Cornelis Petrus
Henning Th
Pascucci Ilaria
No associations
LandOfFree
Grain growth and dust settling in a brown dwarf disk: Gemini/T-ReCS observations of CFHT-BD-Tau 4 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Grain growth and dust settling in a brown dwarf disk: Gemini/T-ReCS observations of CFHT-BD-Tau 4, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Grain growth and dust settling in a brown dwarf disk: Gemini/T-ReCS observations of CFHT-BD-Tau 4 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-414671