Local variance asymmetries in Planck temperature anisotropy maps
  Recently, it was shown that local variance maps of temperature anisotropy are
simple and useful tools for the study of large scale hemispherical power
asymmetry. This was done by studying the distribution of dipoles of the local
variance maps. In this work, we extend the study of the dipolar asymmetry in
local variance maps using foreground cleaned Planck 143 GHz and 217 GHz data to
smaller scales. In doing so, we include the effect of the CMB Doppler dipole.
Further, we show that it is possible to use local variance maps to measure the
Doppler dipole in these Planck channel maps, after removing large scale
features (up to $l=600$), at a significance of about $3 \sigma$. At these small
scales, we do not find any power asymmetry in the direction of the anomalous
large scale power asymmetry beyond that expected from cosmic variance. At large
scales, we verify previous results i.e. the presence of hemispherical power
asymmetry at a significance of at least $3.3 \sigma$.
