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Title: THE VLA NASCENT DISK AND MULTIPLICITY SURVEY: FIRST LOOK AT RESOLVED CANDIDATE DISKS AROUND CLASS 0 AND I PROTOSTARS IN THE PERSEUS MOLECULAR CLOUD

We present the first dust emission results toward a sample of seven protostellar disk candidates around Class 0 and I sources in the Perseus molecular cloud from the VLA Nascent Disk and Multiplicity (VANDAM) survey with ∼0.″05 or 12 AU resolution. To examine the surface brightness profiles of these sources, we fit the Ka-band 8 mm dust-continuum data in the u, v-plane to a simple, parametrized model based on the Shakura–Sunyaev disk model. The candidate disks are well-fit by a model with a disk-shaped profile and have masses consistent with known Class 0 and I disks. The inner-disk surface densities of the VANDAM candidate disks have shallower density profiles compared to disks around more evolved Class II systems. The best-fit model radii of the seven early-result candidate disks are R{sub c} > 10 AU; at 8 mm, the radii reflect lower limits on the disk size since dust continuum emission is tied to grain size and large grains radially drift inwards. These relatively large disks, if confirmed kinematically, are inconsistent with theoretical models where the disk size is limited by strong magnetic braking to <10 AU at early times.
Authors:
; ;  [1] ;  [2] ;  [3] ; ;  [4] ;  [5] ;  [6] ;  [7] ;  [8]
  1. Department of Astronomy, University of Illinois, Urbana, IL 61801 (United States)
  2. Leiden Observatory, Leiden University, P.O. Box 9513, 2000-RA Leiden (Netherlands)
  3. Department of Astronomy, University of Virginia, Charlottesville, VA 22903 (United States)
  4. National Radio Astronomy Observatory, Socorro, NM 87801 (United States)
  5. Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States)
  6. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
  7. Max-Planck-Institut für Astronomie, D-69117 Heidelberg (Germany)
  8. Center for Astrophysics and Space Sciences, University of California, San Diego, CA 92093 (United States)
Publication Date:
OSTI Identifier:
22518628
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 817; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BRIGHTNESS; CLOUDS; COMPARATIVE EVALUATIONS; COSMIC DUST; DENSITY; GRAIN SIZE; MASS; MULTIPLICITY; PROTOPLANETS; PROTOSTARS; PUBLIC OPINION; STARS; SURFACES