  Some circumstellar disks, called transitional or hybrid disks, present
characteristics of both protoplanetary disks (significant amount of gas) and
debris disks (evolved structures around young main-sequence stars, composed of
second generation dust, from collisions between planetesimals). Therefore, they
are an ideal astrophysical laboratory to witness the last stages of planet
formation. The circumstellar disk around HD~141569A was intensively observed
and resolved in the past from space but also from the ground but the recent
implementation of high contrast imaging systems opens new opportunities to
re-analyze this object. We analyzed Gemini archival data from the Near-Infrared
Coronagraphic Imager (NICI) obtained in 2011 in the H band, using several
angular differential imaging techniques (classical ADI, LOCI, KLIP). These
images reveal the complex structures of this disk with an unprecedented
resolution. We also include archival Hubble Space Telescope (HST) images as an
independent dataset to confirm these findings. Using an analysis of the inner
edge of the disk, we show that the inner disk is almost axisymmetrical. The
measurement of an offset towards the East observed by previous authors is
likely due to the fact that the Eastern part of this disk is wider and more
complex in substructure. Our precise re-analysis of the eastern side shows
several structures including a splitting of the disk and a small finger
detached from the inner edge on the southeast. Finally, we find that the arc at
250 AU is unlikely to be a spiral, at least not at the inclination derived from
the first ring, but instead could be interpreted as a third belt at a different
inclination. If the very symmetrical inner disk edge is carved by a companion,
the data presented here put additional constraints on its position.
