High-Resolution Near-Infrared Polarimetry and Sub-Millimeter Imaging of
  FS Tau A: Possible Streamers in Misaligned Circumbinary Disk System
  We analyzed the young (2.8-Myr-old) binary system FS Tau A using
near-infrared (H-band) high-contrast polarimetry data from Subaru/HiCIAO and
sub-millimeter CO (J=2-1) line emission data from ALMA. Both the near-infrared
and sub-millimeter observations reveal several clear structures extending to
$\sim$240 AU from the stars. Based on these observations at different
wavelengths, we report the following discoveries. One arm-like structure
detected in the near-infrared band initially extends from the south of the
binary with a subsequent turn to the northeast, corresponding to two bar-like
structures detected in ALMA observations with an LSRK velocity of 1.19-5.64
km/s. Another feature detected in the near-infrared band extends initially from
the north of the binary, relating to an arm-like structure detected in ALMA
observations with an LSRK velocity of 8.17-16.43 km/s. From their shapes and
velocities, we suggest that these structures can mostly be explained by two
streamers that connect the outer circumbinary disk and the central binary
components. These discoveries will be helpful for understanding the evolution
of streamers and circumstellar disks in young binary systems.
