The Structure of the DoAr 25 Circumstellar Disk

Abstract

We present high spatial resolution (< 0.3" = 40$AU)SubmillimeterArrayobservationsofthe865microncontinuumemissionfromthecircumstellardiskaroundtheyoungstarDoAr25.Despiteitsbrightmillimeteremission,thissourceexhibitsonlyacomparativelysmallinfraredexcessandlowaccretionrate,suggestingthatthematerialandstructuralpropertiesoftheinnerdiskmaybeinanadvancedstateofevolution.AsimplemodelofthephysicalconditionsinthediskisderivedfromthesubmillimetervisibilitiesandthecompletespectralenergydistributionusingaMonteCarloradiativetransfercode.Forthestandardassumptionofahomogeneousgrainsizedistributionatalldiskradii,theresultsindicateashallowsurfacedensityprofile,$Σ\propto r^{-p}$ with p = 0.34, significantly less steep than a steady-state accretion disk (p = 1) or the often adopted minimum mass solar nebula (p = 1.5). Even though the total mass of material is large (M_d = 0.10 M_sun), the densities inferred in the inner disk for such a model may be too low to facilitate any mode of planet formation. However, alternative models with steeper density gradients (p = 1) can explain the observations equally well if substantial grain growth in the planet formation region (r < 40 AU) has occurred. We discuss these data in the context of such models with dust properties that vary with radius and highlight their implications for understanding disk evolution and the early stages of planet formation.

ApJL in press

References in corpus (24)

• Spectral Energy Distributions of T Tauri Stars With Passive Circumstellar Disks
• Dust coagulation in protoplanetary disks: a rapid depletion of small grains
• The Submillimeter Array
• Accretion Disks Around Young Objects. III. Grain Growth
• Flaring vs. self-shadowed disks: the SEDs of Herbig Ae/Be stars
• Observations of IC348: The Disk Population at 2-3 Million Years
• High Resolution Submillimeter Constraints on Circumstellar Disk Structure
• Radiative Equilibrium and Temperature Correction in Monte Carlo Radiation Transfer
• Accretion in the Rho-Oph pre-main sequence stars
• A Submillimeter View of Circumstellar Dust Disks in $\rho$ Ophiuchus
• ISOCAM observations of the rho Ophiuchi cloud: Luminosity and mass functions of the pre-main sequence embedded cluster
• On the Diversity of the Taurus Transitional Disks: UX Tau A & Lk Ca 15
• The COMPLETE Survey of Star-Forming Regions: Phase I Data
• Large dust particles in disks around T Tauri stars
• Demographics of Transition Objects
• Large grains in the disk of CQ Tau
• Optical Spectroscopy of the Surface Population of the rho Ophiuchi Molecular Cloud: The First Wave of Star Formation
• Resolving the inner dust disks surrounding LkCa 15 and MWC 480 at mm wavelengths
• Towards Planetesimals in the Disk around TW Hya: 3.5 centimeter Dust Emission
• An Inner Hole in the Disk around TW Hydrae Resolved in 7 Millimeter Dust Emission
• Constraints on properties of the protoplanetary disks around UX Ori and CQ Tau
• Growth and migration of solids in evolving protostellar disks I: Methods and Analytical tests
• A Mid-Infrared Imaging Survey of Embedded Young Stellar Objects in the Rho Ophiuchi Cloud Core
• Resolving and probing the circumstellar disk of the Herbig Ae star MWC 480 at 1.4 mm: Evolved dust?

Cited by in corpus (13)

• Protoplanetary Disks and Their Evolution
• Protoplanetary Disk Structures in Ophiuchus
• The TW Hya Disk at 870 microns: Comparison of CO and Dust Radial Structures
• The Role of Multiplicity in Disk Evolution and Planet Formation
• A Millimeter Continuum Size-Luminosity Relationship for Protoplanetary Disks
• The Nature of Transition Circumstellar Disks I. The Ophiuchus Molecular Cloud
• Grain Growth in the Circumstellar Disks of the Young Stars CY Tau and DoAr 25
• Disks Around T Tauri Stars with SPHERE (DARTTS-S) II: Twenty-one new polarimetric images of young stellar disks
• Demographics of Transition Discs in Ophiuchus and Taurus
• The SEEDS High Contrast Imaging Survey of Exoplanets around Young Stellar Objects
• New Constraints From Dust Lines On The Surface Densities Of Protoplanetary Disks
• Heavy Element Enrichment of a Jupiter-mass Protoplanet as a Function of Orbital Location
• Testing velocity kinks as a planet-detection method: Do velocity kinks in surface gas emission trace planetary spiral wakes in the midplane continuum?