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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709913.0, MPI für Astronomie / Publikationen_mpia
GG Tauri: the fifth element
Authors:Di Folco, E.; Dutrey, A.; Le Bouquin, J. -. B.; Lacour, S.; Berger, J. -. P.; Köhler, R.; Guilloteau, S.; Piétu, V.; Bary, J.; Beck, T.; Beust, H.; Pantin, E.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Astronomy and Astrophysics
Start Page:id. L2 (6 pp)
Audience:Not Specified
Abstract / Description:We aim at unveiling the observational imprint of physical mechanisms that govern planetary formation in young, multiple systems. In particular, we investigate the impact of tidal truncation on the inner circumstellar disks. We observed the emblematic system GG Tau at high-angular resolution: a hierarchical quadruple system composed of low-mass T Tauri binary stars surrounded by a well studied, massive circumbinary disk in Keplerian rotation. We used the near-IR 4-telescope combiner PIONIER on the VLTI and sparse-aperture-masking techniques on VLT/NaCo to probe this proto-planetary system at sub-au scales. We report the discovery of a significant closure-phase signal in H and Ks bands that can be reproduced with an additional low-mass companion orbiting GG Tau Ab, at a (projected) separation rho = 31.7 ± 0.2 mas (4.4 au) and PA = 219.6 ± 0.3°. This finding offers a simple explanation for several key questions in this system, including the missing-stellar-mass problem and the asymmetry of continuum emission from the inner dust disks observed at millimeter wavelengths. Composed of now five co-eval stars with 0.02 <= M* <= 0.7 M&sun;, the quintuple system GG Tau has become an ideal test case to constrain stellar evolution models at young ages (few 106 yr). Based on ESO programs 090.C-0339(A,F).Appendix A is available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201423675/olm">http://www.aanda.org</A>FITS files are available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> ( or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/565/L2">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/565/L2</A>
Free Keywords:binaries: close; techniques: high angular resolution; techniques: interferometric; protoplanetary disks
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201423675
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