摘要：Aims. The immediate vicinity of T Tauri was observed with the new
high-contrast imaging instrument SPHERE at the VLT to resolve remaining mysteries of the
system, such as the putative small edge-on disk around T Tauri Sa and the assignment of
the complex outflow patterns to the individual stars.
Methods. We used SPHERE IRDIS narrow-band classical imaging in
Paβ,
Brγ, and
the ν =
1−0 S(1) line of
H2, as well as in
the nearby continua to obtain high spatial resolution and high-contrast images over the
near-infrared spectral range. Line maps were created by subtracting the nearby continuum.
We also reanalyzed coronagraphic data taken with SPHERE’s integral field spectrograph in
J- and
H-band with
the goal of obtaining a precise extinction estimate to T Tauri Sb, and of verifying the
recently reported claim of another stellar or substellar object in the system.
Results. A previously unknown coiling structure is observed southwest of
the stars in reflected light, which points to the vicinity of T Tauri N. We map the
circumbinary emission from T Tauri S in J- and H-band scattered light for the first time, showing
a morphology that differs significantly from that observed in K-band. Molecular Hydrogen
emission is found southwest of the stars, near the coiling structure. We also detect the
H2 emitting
region T Tauri NW. The motion of T Tauri NW with respect to T Tauri N and S between
previous images and our 2014 data provides strong evidence that the southeast–northwest
outflow triggering T Tauri NW is likely to be associated with T Tauri S. We also present
accurate relative photometry of the stars, which confirms that T Tauri Sa is brightening
again. Our analysis rules out the presence of the recently proposed companion to T Tauri N
with high confidence.
关键词：techniques: high angular resolution;stars: formation;stars: individual: T Tauri;stars: winds, outflows
