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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731975.0, MPI für Astronomie / Publikationen_mpia
Ringed substructure and a gap at 1 au in the nearest protoplanetary disk
Authors:Andrews, S. M.; Wilner, D. J.; Zhu, Z.; Birnstiel, T.; Carpenter, J. M.; Pérez, L. M.; Bai, X.-N.; Öberg, K. I.; Hughes, A. M.; Isella, A.; Ricci, L.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:The Astrophysical Journal Letters
Issue / Number:2
Start Page:id. L40 (5 pp)
Audience:Not Specified
Abstract / Description:We present long baseline Atacama Large Millimeter/submillimeter Array (ALMA) observations of the 870 μm continuum emission from the nearest gas-rich protoplanetary disk, around TW Hya, that trace millimeter-sized particles down to spatial scales as small as 1 au (20 mas). These data reveal a series of concentric ring-shaped substructures in the form of bright zones and narrow dark annuli (1-6 au) with modest contrasts (5%-30%). We associate these features with concentrations of solids that have had their inward radial drift slowed or stopped, presumably at local gas pressure maxima. No significant non-axisymmetric structures are detected. Some of the observed features occur near temperatures that may be associated with the condensation fronts of major volatile species, but the relatively small brightness contrasts may also be a consequence of magnetized disk evolution (the so-called zonal flows). Other features, particularly a narrow dark annulus located only 1 au from the star, could indicate interactions between the disk and young planets. These data signal that ordered substructures on ˜au scales can be common, fundamental factors in disk evolution and that high-resolution microwave imaging can help characterize them during the epoch of planet formation.
Free Keywords:planet–disk interactions; protoplanetary disks; stars: individual: TW Hydrae
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.3847/2041-8205/820/2/L40
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