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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731792.0, MPI für Astronomie / Publikationen_mpia
The VLA Nascent Disk and Multiplicity Survey: First Look at Resolved Candidate Disks around Class 0 and I Protostars in the Perseus Molecular Cloud
Authors:Segura-Cox, D. M.; Harris, R. J.; Tobin, J. J.; Looney, L. W.; Li, Z.-Y.; Chandler, C.; Kratter, K.; Dunham, M. M.; Sadavoy, S.; Perez, L.; Melis, C.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:The Astrophysical Journal Letters
Issue / Number:2
Start Page:id. L14 (6 pp)
Audience:Not Specified
Abstract / Description: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 Rc > 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.
Free Keywords:protoplanetary disks; stars: protostars
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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