Examining the T Tauri system with SPHERE

Gergely Csépány, Mario Van Den Ancker, P. Ábrahám, Wolfgang Brandner, Felix Hormuth

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Context. The prototypical low-mass young stellar object, T Tauri, is a well-studied multiple system with at least three components. 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. 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 0.05000 and 0.05900, making these the highest spatial resolution near-infrared images of the T Tauri system obtained to date. 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 X 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.

Original languageEnglish
Article numberL9
JournalAstronomy and Astrophysics
Volume578
DOIs
Publication statusPublished - Jun 1 2015

Fingerprint

near infrared
spatial resolution
orbits
stars
orbitals
eccentric orbits
center of gravity
high resolution
circular orbits
spectrographs
narrowband
gravity
broadband
young
parameter
method
science

Keywords

  • Binaries: visual
  • Instrumentation: adaptive optics
  • Stars: evolution
  • Stars: pre-main sequence
  • Stars: variables: T Tauri, Herbig Ae/Be
  • Techniques: high angular resolution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Csépány, G., Van Den Ancker, M., Ábrahám, P., Brandner, W., & Hormuth, F. (2015). Examining the T Tauri system with SPHERE. Astronomy and Astrophysics, 578, [L9]. https://doi.org/10.1051/0004-6361/201526201

Examining the T Tauri system with SPHERE. / Csépány, Gergely; Van Den Ancker, Mario; Ábrahám, P.; Brandner, Wolfgang; Hormuth, Felix.

In: Astronomy and Astrophysics, Vol. 578, L9, 01.06.2015.

Research output: Contribution to journalArticle

Csépány, G, Van Den Ancker, M, Ábrahám, P, Brandner, W & Hormuth, F 2015, 'Examining the T Tauri system with SPHERE', Astronomy and Astrophysics, vol. 578, L9. https://doi.org/10.1051/0004-6361/201526201
Csépány, Gergely ; Van Den Ancker, Mario ; Ábrahám, P. ; Brandner, Wolfgang ; Hormuth, Felix. / Examining the T Tauri system with SPHERE. In: Astronomy and Astrophysics. 2015 ; Vol. 578.
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