ARRAKIS: Atlas of Resonance Rings As Known In the S4G
  Resonance rings are the consequence of secular evolution processes that
redistribute material and angular momentum in discs. We produced a Catalogue
and an Atlas of the rings detected in the Spitzer Survey of Stellar Structure
in Galaxies (S4G) and to conduct a statistical study of the data in the
Catalogue.
  We traced the contours of rings previously identified by Buta et al. (in
preparation) and fitted them with ellipses. We found the orientation of bars by
studying the galaxy ellipse fits from S4G's Pipeline 4. We used the galaxy
orientation data obtained by S4G's Pipeline 4 to obtain intrinsic ellipticities
and orientations of rings and the bars.
  ARRAKIS contains data on 724 ringed galaxies in the S4G. The frequency of
resonance rings in the S4G is of 16+-1% and 35+-1% for outer and inner
features, respectively. Outer rings are mostly found in Hubble stages -1<=T<=4.
Inner rings are found in a distribution that covers the range -1<=T<=7. We
confirm that outer rings have two preferred orientations, parallel and
perpendicular to the bar. We confirm a tendency for inner rings to be oriented
parallel to the bar, but we find that a significant fraction (~50%) of them
have random orientations with respect to the bar. These misaligned inner rings
are mostly found in late-type galaxies (T>=4). This may be due to spiral modes
decoupled from the bar dominating the Fourier amplitude spectrum at the radius
of the inner ring.
  We find that the fraction of barred galaxies hosting outer (inner) rings is
~1.7 times (~1.3 times) that in unbarred galaxies. The fact that rings are only
mildly favoured by bars suggests that those in unbarred galaxies either formed
due to weak departures from the axisymmetry of the galactic potential or that
they are born because of bars that have been destroyed after the ring
formation.
