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LoTr 5 is a planetary nebula with an unusual long-period binary central star.As far as we know, the pair consists of a rapidly rotating G-type star and ahot star, which is responsible for the ionization of the nebula. The rotationperiod of the G-type star is 5.95 days and the orbital period of the binary isnow known to be $\sim$2700 days, one of the longest in central star ofplanetary nebulae. The spectrum of the G central star shows a complex H$\alpha$double-peaked profile which varies with very short time scales, also reportedin other central stars of planetary nebulae and whose origin is still unknown.We present new radial velocity observations of the central star which allow usto confirm the orbital period for the long-period binary and discuss thepossibility of a third component in the system at $\sim$129 days to the G star.This is complemented with the analysis of archival light curves from SuperWASP,ASAS and OMC. From the spectral fitting of the G-type star, we obtain aeffective temperature of $T_{\rm eff}$ = 5410$\pm$250 K and surface gravity of$\log g$ = 2.7$\pm$0.5, consistent with both giant and subgiant stars. We alsopresent a detailed analysis of the H$\alpha$ double-peaked profile and concludethat it does not present correlation with the rotation period and that thepresence of an accretion disk via Roche lobe overflow is unlikely.

A new look inside Planetary Nebula LoTr 5: A long-period binary with hints of a possible third component