期刊
ASTROPHYSICAL JOURNAL
卷 775, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/775/2/136
关键词
circumstellar matter; planet-disk interactions; protoplanetary disks; stars: individual (V4046 Sgr); submillimeter: planetary systems
资金
- NASA Origins of Solar Systems grant [NNX11AK63]
- National Science Foundation [AST-1108950]
- Smithsonian Institution
- Academia Sinica
- NASA
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1108950] Funding Source: National Science Foundation
We present sensitive, sub-arcsecond resolution Submillimeter Array observations of the protoplanetary disk around the nearby, pre-main sequence spectroscopic binary V4046 Sgr. We report for the first time a large inner hole (r = 29 AU) spatially resolved in the 1.3 mm continuum emission and study the structure of this disk using radiative transfer calculations to model the spectral energy distribution, continuum visibilities, and spectral line emission of CO and its main isotopologues. Our modeling scheme demonstrates that the majority of the dust mass is distributed in a narrow ring (centered at 37 AU with a FWHM of 16 AU) that is similar to 5x more compact than the gas disk. This structure implies that the dust-to-gas mass ratio has a strong spatial variation, ranging from a value much larger than typical of the interstellar medium (ISM) at the ring to much smaller than that of the ISM at larger disk radii. We suggest that these basic structural features are potentially observational signatures of the accumulation of solids at a local gas pressure maximum. These models also require a substantial population of similar to mu m sized grains inside the central disk cavity. We suggest that this structure is likely the result of dynamical interactions with a low-mass companion, although photoevaporation may also play a secondary role.
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