Structure and Composition of Two Transitional Circumstellar Disks in Corona Australis

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dc.contributor.author Silverstone, Murray
dc.date.accessioned 2019-06-11T17:47:27Z
dc.date.available 2019-06-11T17:47:27Z
dc.date.copyright 2010
dc.date.issued 2010-08-13
dc.identifier.citation Hughes, A.M., et al. (2010): Structure and Composition of Two Transitional Circumstellar Disks in Corona Australis. The Astronomical Journal, 140(3). DOI: http://dx.doi.org/10.1088/0004-6256/140/3/887 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5719
dc.description.abstract The late stages of evolution of the primordial circumstellar disks surrounding young stars are poorly understood, yet vital to constraining theories of planet formation. We consider basic structural models for the disks around two ~10 Myr old members of the nearby RCrA association: RX J1842.9 -3532 and RX J1852.3-3700. We present new arcsecond-resolution maps of their 230 GHz continuum emission from the Submillimeter Array and unresolved CO(3-2) spectra from the Atacama Submillimeter Telescope Experiment. By combining these data with broadband fluxes from the literature and infrared fluxes and spectra from the catalog of the Formation and Evolution of Planetary Systems Legacy program on the Spitzer Space Telescope, we assemble a multiwavelength data set probing the gas and dust disks. Using the Monte Carlo radiative transfer code RADMC to model simultaneously the spectral energy distribution and millimeter continuum visibilities, we derive basic dust disk properties and identify an inner cavity of radius 16 AU in the disk around RX J1852.3–3700. We also identify an optically thin 5 AU cavity in the disk around RX J1842.9–3532, with a small amount of optically thick material close to the star. The molecular line observations suggest an intermediate disk inclination in RX J1842.9–3532, consistent with the continuum emission. In combination with the dust models, the molecular data allow us to derive a lower CO content than expected, suggesting that the process of gas clearing is likely underway in both systems, perhaps simultaneously with planet formation. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.publisher American Astronomical Society en_US
dc.subject Circumstellar matter en_US
dc.subject Protoplanetary disks en_US
dc.subject Stars en_US
dc.title Structure and Composition of Two Transitional Circumstellar Disks in Corona Australis en_US
dc.type text en_US
dc.rights.holder American Astronomical Society en_US


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