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We present the analysis of Multi-Espectr\'ografo en GTC de Alta Resoluci\'onpara Astronom\'ia (MEGARA) high-dispersion integral field spectroscopicobservations of the bipolar planetary nebula (PN) M 3-38. These observationsunveil the presence of a fast outflow aligned with the symmetry axis of M 3-38that expands with a velocity up to $\pm$225 km s$^{-1}$. The deprojected spacevelocity of this feature can be estimated to be $\approx$320$^{+130}_{-60}$ kms$^{-1}$, which together with its highly collimated morphology suggests that itis one of the fastest jet detected in a PN. We have also used Keplerobservations of the central star of M 3-38 to unveil variability associatedwith a dominant period of 17.7 days. We attribute this to the presence of alow-mass star with an orbital separation of $\approx$0.12-0.16 au. The fast andcollimated ejection and the close binary system point towards a common envelopeformation scenario for M 3-38.

The common envelope origins of the fast jet in the planetary nebula M 3-38