EDP Sciences
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Volume 439, Number 2, August IV 2005
Page(s) 585 - 594
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20042441

A&A 439, 585-594 (2005)
DOI: 10.1051/0004-6361:20042441

Dynamics of the young multiple system GG Tauri

I. Orbital fits and inner edge of the circumbinary disk of GG Tau A
H. Beust1 and A. Dutrey1, 2

1  Laboratoire d'Astrophysique de Grenoble, Université J. Fourier, UMR 5571 du CNRS, BP 53, 38041 Grenoble Cedex 9, France
    e-mail: herve.beust@obs.ujf-grenoble.fr
2  Laboratoire d'Astrodynamique, d'Astrophysique et d'Aéronomie de Bordeaux, 2 rue de l'Observatoire, BP 89, 33270 Floirac, France

(Received 26 November 2004 / Accepted 1 April 2005 )

The GG Tauri system is a prototype example of a young, pre-main sequence multiple stellar system. Both millimeter and optical observations reveal that the central binary ( GG Tau A) harbors a ring-shape circumbinary disk. In this paper, we analyse a compilation of astrometric data of the GG Tau A binary over 12 years that allow us, in combination with information coming from the disk observations (millimeter data), to derive a fairly accurate fit of the orbit ($a=32.4\,$AU, e=0.34). We also perform a dynamical study of the circumbinary disk, and show that in order to be in agreement with the orbit deduced from the fit, the inner gap of the disk should be approximatively twice as small as observed. We show that if we allow the error bars on the astrometric data to be larger, another orbit may be found ($a=62\,$AU, e=0.35), compatible with the location of the inner disk gap, although only marginally compatible with the astrometric data. Possible solutions to solve this discrepancy are discussed.

Key words: stars: circumstellar matter -- stars: individual: GG Tau -- methods: numerical -- celestial mechanics -- planetary systems: protoplanetary disks

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