L483: Warm Carbon-Chain Chemistry Source Harboring Hot Corino Activity
  The Class 0 protostar, L483, has been observed in various molecular lines in
the 1.2 mm band at a sub-arcsecond resolution with ALMA. An infalling-rotating
envelope is traced by the CS line, while a very compact component with a broad
velocity width is observed for the CS, SO, HNCO, NH$_2$CHO, and HCOOCH$_3$
lines. Although this source is regarded as the warm carbon-chain chemistry
(WCCC) candidate source at a 1000 au scale, complex organic molecules
characteristic of hot corinos such as NH$_2$CHO and HCOOCH$_3$ are detected in
the vicinity of the protostar. Thus, both hot corino chemistry and WCCC are
seen in L483. Although such a mixed chemical character source has been
recognized as an intermediate source in previous single-dish observations, we
here report the first spatially-resolved detection. A kinematic structure of
the infalling-rotating envelope is roughly explained by a simple ballistic
model with the protostellar mass of 0.1--0.2 $M_\odot$ and the radius of the
centrifugal barrier (a half of the centrifugal radius) of 30--200 au, assuming
the inclination angle of 80\degr\ (0\degr\ for a face-on). The broad line
emission observed in the above molecules most likely comes from the disk
component inside the centrifugal barrier. Thus, a drastic chemical change is
seen around the centrifugal barrier.
