Morpho-kinematics of the circumstellar envelope of the AGB star R Dor: a
  global view
  We analyse new ALMA observations of the $^{29}$SiO ($\nu$=0, $J$=8$-$7) and
SO$_2$($\nu$=0, $34_{3,31}$$-$$34_{2,32}$) line emissions of the circumstellar
envelope (CSE) of the oxygen-rich AGB star R Dor. With a spatial resolution of
$\sim$2.3 au, they cover distances below $\sim$30 au from the star providing a
link between earlier observations and clarifying some open issues. The main
conclusions are: 1) Rotation is confined below $\sim$15 au from the star, with
velocity reaching a maximum below 10 au and morphology showing no significant
disc-like flattening. 2) In the south-eastern quadrant, a large Doppler
velocity gas stream is studied in more detail than previously possible and its
possible association with an evaporating planetary companion is questioned. 3)
A crude evaluation of the respective contributions of rotation, expansion and
turbulence to the morpho-kinematics is presented. Significant line broadening
occurs below $\sim$12 au from the star and causes the presence of high Doppler
velocity components near the line of sight pointing to the centre of the star.
4) Strong absorption of the continuum emission of the stellar disc and its
immediate dusty environment is observed to extend beyond the disc in the form
of self-absorption. The presence of a cold SiO layer extending up to some 60 au
from the star is shown to be the cause. 5) Line emissions from SO, $^{28}$SiO,
CO and HCN molecules are used to probe the CSE up to some 100 au from the star
and reveal the presence of two broad back-to-back outflows, the morphology of
which is studied in finer detail than in earlier work.
