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Title:
The Disk Around CoKu Tauri/4: Circumbinary, Not Transitional
Authors:
Ireland, M. J.; Kraus, A. L.
Affiliation:
AA(Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125; .), AB(Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125.)
Publication:
The Astrophysical Journal, Volume 678, Issue 1, pp. L59-L62. (ApJL Homepage)
Publication Date:
05/2008
Origin:
UCP
ApJ Keywords:
Stars: Low-Mass, Brown Dwarfs
DOI:
10.1086/588216
Bibliographic Code:
2008ApJ...678L..59I

Abstract

CoKu Tau/4 has been labeled as one of the very few known transition disk objects-disks around young stars that have their inner disks cleared of dust, arguably as a result of planetary formation. We report aperture-masking interferometry and adaptive optics imaging observations showing that CoKu Tau/4 is in fact a near-equal binary star of projected separation ~53 mas (~8 AU). The spectral energy distribution of the disk is then naturally explained by the inner truncation of the disk through gravitational interactions with the binary star system. We discuss the possibility that such ``unseen'' binary companions could cause other circumbinary disks to be labeled as transitional.

Data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

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