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

D. Apai, I. Pascucci, M. F. Sterzik, N. Van Der Bliek, J. Bouwman, C. P. Dullemond, Th Henning

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

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 μm 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 μm 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.

Original languageEnglish (US)
Pages (from-to)L53-L57
JournalAstronomy and astrophysics
Volume426
Issue number3
DOIs
StatePublished - Nov 2004
Externally publishedYes

Keywords

  • Accretion, accretion disks
  • Circumstellar matter
  • Planetary systems: protoplanetary disks
  • Stars: individual: CFHT-BD-Tau 4
  • Stars: low-mass, brown dwarfs
  • Stars: pre-main sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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