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Astron. Astrophys. 348, 570-578 (1999)

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GG Tauri: the ring world

S. Guilloteau 1, A. Dutrey 1 and M. Simon 2

1 Institut de Radio Astronomie Millimétrique, 300 Rue de la Piscine, F-38406 Saint Martin d'Hères, France
2 Department of Physics and Astronomy, State University of New York, Stony Brook, NY 11794-3800, USA

Received 22 October 1998 / Accepted 16 April 1999

Abstract

We present sub-arcsecond images of the mm dust emission and 13CO J=2-1 line emission in the young quadruple system GG Tau. These observations unambiguously resolve the circumbinary disk of the close ([FORMULA]) binary system into two distinct components: an extremely dense, sharp-edged ring, surrounded by an extended disk. Continuum emission is also detected from the center of this structure; it probably arises in the small circumstellar disk or disks of the binary. The kinematic data show that the ring+disk system is in Keplerian rotation and yield the estimate [FORMULA] for the mass of the binary stars. We derive the physical parameters of the ring and disk from these data and from new 2" resolution images of the HCO+ J=1-0 line and 3.4 mm continuum emission. The temperature in the ring + disk system is consistent with heating by the stellar light (including the IR excess coming from the inner disks). Comparison with the optical/NIR images indicates a disk thickness compatible with an hydrostatic equilibrium.

Key words: stars: binaries: close – stars: circumstellar matter – stars: individual: GG Tau – stars: pre-main sequence – radio continuum: stars – radio lines: stars

Send offprint requests to: S. Guilloteau

Correspondence to: guillote@iram.fr

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© European Southern Observatory (ESO) 1999

Online publication: July 26, 1999
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