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Radial Surface Density Profiles of Gas and Dust in the Debris Disk Around 49 CetiWe present approximately 0".4 resolution images of CO(3-2) and associated continuum emission from the gas-bearing debris disk around the nearby A star 49 Ceti, observed with the Atacama Large Millimeter/Submillimeter Array (ALMA). We analyze the ALMA visibilities in tandem with the broadband spectral energy distribution to measure the radial surface density profiles of dust and gas emission from the system. The dust surface density decreases with radius between approximately 100 and 310 au, with a marginally significant enhancement of surface density at a radius of approximately 110 au. The SED requires an inner disk of small grains in addition to the outer disk of larger grains resolved by ALMA. The gas disk exhibits a surface density profile that increases with radius, contrary to most previous spatially resolved observations of circumstellar gas disks. While approximately 80% of the CO flux is well described by an axisymmetric power-law disk in Keplerian rotation about the central star, residuals at approximately 20% of the peak flux exhibit a departure from axisymmetry suggestive of spiral arms or a warp in the gas disk. The radial extent of the gas disk (approx. 220 au) is smaller than that of the dust disk (approx. 300 au), consistent with recent observations of other gasbearing debris disks. While there are so far only three broad debris disks with well characterized radial dust profiles at millimeter wavelengths, 49 Ceti's disk shows a markedly different structure from two radially resolved gas-poor debris disks, implying that the physical processes generating and sculpting the gas and dust are fundamentally different.
Document ID
20170007785
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Hughes, A. Meredith
(Wesleyan Univ. Middletown, CT, United States)
Lieman-Sifry, Jesse
(Wesleyan Univ. Middletown, CT, United States)
Flaherty, Kevin M.
(Wesleyan Univ. Middletown, CT, United States)
Daley, Cail M.
(Wesleyan Univ. Middletown, CT, United States)
Roberge, Aki
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Kospal, Agnes
(Konkoly Observatory Budapest, Hungary)
Moor, Attila
(Konkoly Observatory Budapest, Hungary)
Kamp, Inga
(Groningen Rijksuniv. Netherlands)
Wilner, David J.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Andrews, Sean M.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Kastner, Joel H.
(Rochester Inst. of Tech. Rochester, NY, United States)
Abraham, Peter
(Konkoly Observatory Budapest, Hungary)
Date Acquired
August 17, 2017
Publication Date
April 19, 2017
Publication Information
Publication: The Astrophysical Journal
Publisher: The American Astronomical Society
Volume: 839
Issue: 2
ISSN: 0004-637X
e-ISSN: 1538-4357
Subject Category
Astrophysics
Astronomy
Report/Patent Number
GSFC-E-DAA-TN45575
Funding Number(s)
CONTRACT_GRANT: NSF AST-1412647
CONTRACT_GRANT: NNX16AB43G
CONTRACT_GRANT: NSF CNS-0619508
Distribution Limits
Public
Copyright
Other
Keywords
Atacama Large Millimeter Submillimeter Array(ALMA)

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