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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 730296.0, MPI für Astronomie / Publikationen_mpia
Examining the T Tauri system with SPHERE
Authors:Csépány, G.; van den Ancker, M.; Ábrahám, P.; Brandner, W.; Hormuth, F.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Astronomy and Astrophysics
Start Page:id. L9 (5 pp)
Audience:Not Specified
Abstract / Description:Context. The prototypical low-mass young stellar object, T Tauri, is a well-studied multiple system with at least three components. <BR /> Aims: We aim to explore the T Tau system with the highest spatial resolution, study the time evolution of the known components, and re-determine the orbital parameters of the stars. <BR /> Methods: Near-infrared classical imaging and integral field spectrograph observations were obtained during the Science Verification of SPHERE, the new high-contrast imaging facility at the VLT. The obtained FWHM of the primary star varies between 0.050'' and 0.059'', making these the highest spatial resolution near-infrared images of the T Tauri system obtained to date. <BR /> Results: Our near-infrared images confirm the presence of extended emission south of T Tau Sa, reported in the literature. New narrow-band images show, for the first time, that this feature shows strong emission in both the Br-γ and H2 1-0 S(1) lines. Broadband imaging at 2.27 μm shows that T Tau Sa is 0.92 mag brighter than T Tau Sb, which is in contrast to observations from Jan. 2014 (when T Tau Sa was fainter than Sb), and demonstrates that T Tau Sa has entered a new period of high variability. The newly obtained astrometric positions of T Tau Sa and Sb agree with orbital fits from previous works. The orbit of T Tau S (the centre of gravity of Sa and Sb) around T Tau N is poorly constrained by the available observations and can be fit with a range of orbits ranging from a nearly circular orbit with a period of 475 years to highly eccentric orbits with periods up to 2.7 × 104 years. We also detected a feature south of T Tau N, at a distance of 144 ± 3 mas, which shows the properties of a new companion. Based on observations made at the La Silla Paranal Observatory under programme ID 60.A-9363(A) and 60.A-9364(A).Figures 3-5 are available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201526201/olm">http://www.aanda.org</A>
Free Keywords:stars: variables: T Tauri; Herbig Ae/Be; stars: pre-main sequence; stars: evolution; binaries: visual; techniques: high angular resolution; instrumentation: adaptive optics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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