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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 607207.0, MPI für Astronomie / Publikationen_mpia
Multi-wavelength observations of the young binary system Haro 6-10: The case of misaligned discs
Authors:Roccatagliata, V.; Ratzka, T.; Henning, T.; Wolf, S.; Leinert, C.; Bouwman, J.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:Astronomy and Astrophysics
Start Page:33
Audience:Not Specified
Abstract / Description:Context. We present a multi-wavelength, high-resolution observational survey of the young binary system Haro 6-10 (GV Tau, IRAS 04263+2426), which harbours one of the few known infrared companions. <BR /> Aims: The primary goal of this project is to determine the physical and geometrical properties of the circumstellar and circumbinary material in the Haro 6-10 system. <BR /> Methods: High-resolution optical (HST/WFPC2) and near-infrared (VLT/NACO) images in different bands were analysed to investigate the large-scale structures of the material around the binary. Mid-infrared interferometry (VLTI/MIDI) and spectroscopy (TIMMI2 at the 3.6 m ESO telescope) were carried out to determine the structure and optical depth of the circumstellar material around the individual components. <BR /> Results: The multi-wavelength observations suggest that both components of the binary system Haro 6-10 are embedded in a common envelope. The measured extinction indicates a dust composition of the envelope similar to that of the interstellar medium. Each component of the system has a circumstellar disc-like structure typical of young stars. The discs are highly misaligned: the northern component is seen almost edge-on and the southern component is an almost face-on disc. <BR /> Conclusions: The two main formation scenarios of binary systems with misaligned discs are the gravitational capture of a passing object in a dense environment and the fragmentation of the collapsing molecular cloud. Given the low-density environment of the Taurus-Aurigae star-forming region, the first scenario is unlikely for Haro 6-10. The binary system most probably formed via fragmentation of two different parts of the collapsing molecular cloud combined with other dynamical processes related to the cloud and/or the protostars. This can also be the explanation for other binary systems with an infrared companion. Based on observations collected at the European Southern Observatory, Paranal, Chile (Proposal IDs: 070.C-0544(A); 072.C-0321(A); 274.C-5032(A); 076.C-0200(A)).
Free Keywords:binaries: general; stars: formation; protoplanetary disks; stars: individual: Haro 6-10
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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