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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 559051.0, MPI für Astronomie / Publikationen_mpia
Protoplanetary disk structures in Ophiuchus. II. Extension to fainter sources
Authors:Andrews, Sean M.; Wilner, D. J.; Hughes, A. M.; Qi, Chunhua; Dullemond, C. P.
Language:English
Date of Publication (YYYY-MM-DD):2010
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Volume:723
Issue / Number:2
Start Page:1241
End Page:1254
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present new results from a significant extension of our previous high angular resolution (0farcs3 ≈ 40 AU) submillimeter array survey of the 340 GHz (880 μm) thermal continuum emission from dusty circumstellar disks in the ~1 Myr old Ophiuchus star-forming region. An expanded sample is constructed to probe disk structures that emit significantly lower millimeter luminosities (hence dust masses), down to the median value for T Tauri stars. Using a Monte Carlo radiative transfer code, the millimeter visibilities and broadband spectral energy distribution for each disk are simultaneously reproduced with a two-dimensional parametric model for a viscous accretion disk that has a surface density profile Σ vprop (R/Rc )-γexp [ - (R/Rc )2-γ]. We find wide ranges of characteristic radii (Rc = 14-198 AU) and disk masses (Md = 0.004-0.143 M sun), but a narrow distribution of surface density gradients (γ = 0.4-1.1) that is consistent with a uniform value langγrang = 0.9 ± 0.2 and independent of mass (or millimeter luminosity). In this sample, we find a correlation between the disk luminosity/mass and characteristic radius, such that fainter disks are both smaller and less massive. We suggest that this relationship is an imprint of the initial conditions inherited by the disks at their formation epoch, compare their angular momenta with those of molecular cloud cores, and speculate on how future observations can help constrain the distribution of viscous evolution timescales. No other correlations between disk and star properties are found. The inferred disk structures are briefly compared with theoretical models for giant planet formation, although resolution limitations do not permit us to directly comment on material inside R ≈ 20 AU. However, there is some compelling evidence for the evolution of dust in the planet formation region: 4/17 disks in the sample show resolved regions of significantly reduced millimeter optical depths within ~20-40 AU of their central stars.
Free Keywords:accretion; accretion disks; circumstellar matter; planetary systems; protoplanetary disks; stars: pre-main sequence
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010ApJ...723.1241A [ID No:1]
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