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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 308587.0, MPI für Astronomie / Publikationen_mpia
Large dust particles in disks around T Tauri stars
Authors:Rodmann, J.; Henning, T.; Chandler, C. J.; Mundy, L. G.; Wilner, D. J.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:Astronomy and Astrophysics
Volume:446
Start Page:211
End Page:221
Audience:Not Specified
Abstract / Description:We present 7-mm continuum observations of 14 low-mass pre-main-sequence stars in the Taurus-Auriga star-forming region obtained with the Very Large Array with ~1.''5 resolution and ~0.3 mJy rms sensitivity. For 10 objects, the circumstellar emission has been spatially resolved. The large outer disk radii derived suggest that the emission at this wavelength is mostly optically thin. The millimetre spectral energy distributions are characterised by spectral indices alphamm= 2.3 to 3.2. After accounting for contributions from free-free emission and corrections for optical depth, we determine dust opacity indices beta in the range 0.5 to 1.6, which suggest that millimetre-sized dust aggregates are present in the circumstellar disks. Four of the sources with beta>1 may be consistent with submicron-sized dust as found in the interstellar medium. Our findings indicate that dust grain growth to millimetre-sized particles is completed within less than 1 Myr for the majority of circumstellar disks.
Free Keywords:stars: pre-main sequence; stars: planetary systems: protoplanetary disks; planetary systems: formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi...
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