  The present work is a critical revision of the hypothesis of the planetary
tidal influence on solar activity published by Abreu et al. (Astron. Astrophys.
548, A88, 2012; called A12 here). A12 describes a hypothesis that planets can
have an impact on the solar tachocline and therefore on solar activity. We
checked the procedure and results of A12, namely the algorithm of planetary
tidal torque calculation and the wavelet coherence between torque and
heliospheric modulation potential. We found that the claimed peaks in
long-period range of the torque spectrum are artefacts caused by the
calculation algorithm. Also the statistical significance of the results of the
wavelet coherence is found to be overestimated by an incorrect choice of the
background assumption of red noise. Using a more conservative non-parametric
random phase method, we found that the long-period coherence between planetary
torque and heliospheric modulation potential becomes insignificant. Thus we
conclude that the considered hypothesis of planetary tidal influence on solar
activity is not based on a solid ground.
