Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...348..570g&link_type=abstract
Astronomy and Astrophysics, v.348, p.570-578 (1999)
Astronomy and Astrophysics
Astrophysics
127
Stars: Binaries: Close, Stars: Circumstellar Matter, Stars: Individual: Gg Tau, Stars: Pre-Main Sequence, Radio Continuum: Stars, Radio Lines: Stars
Scientific paper
We present sub-arcsecond images of the mm dust emission and \thirco\ J=2-1 line emission in the young quadruple system GG Tau. These observations unambiguously resolve the circumbinary disk of the close ( ~ 0.3'') 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 M = (1.28 +/- 0.07)(D/140 pc) M_\odot 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.
Dutrey Anne
Guilloteau Stéphane
Simon Manfred
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