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Disks in Young Binary Systems: Unresolved Millimeter-Wave Observations

Published online by Cambridge University Press:  13 May 2016

Eric L. N. Jensen
Eric L. N. Jensen*
Affiliation:
Swarthmore College, Dept. of Physics & Astronomy, Swarthmore, PA 19081 USA

Abstract

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Observations at millimeter and submillimeter wavelengths are sensitive to the total mass of circumstellar and circumbinary dust in a multiple system, and in some cases single-dish observations can help constrain the location of disk material in spite of their lack of spatial resolution. Young binary stars show a great diversity of disk properties, with a large part of the variation accounted for by binary separation. Many of the closest binaries (those with separations a less than a few AU) harbor massive circumbinary disks. Binaries with a ≳ 100 AU tend to have massive circumstellar disks. In both cases, the properties of these disks (as deduced from millimeter and infrared fluxes) are indistinguishable from those around single stars. In the intermediate separation range (10 ≲ a ≲ 100), however, while disks do exist in most binaries, they are strongly limited by the presence of stellar companion, with inferred dust masses of order an Earth mass. While comparison of sample properties is secure, calculating masses in individual systems is limited by the uncertainty in dust opacity and surface density distribution laws (as in single stars), with the additional complication of the uncertain disk geometry in the system.

Type
VIII. Environments of Young Binaries - Indirect Observations
Information
Symposium - International Astronomical Union , Volume 200: The Formation of Binary Stars , 2001 , pp. 285 - 294
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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