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XO-7b is a hot Jupiter transiting a $V = 10.52$ mag G0V-type star. Theplanetary system is interesting because the linear slope in the discoveryradial-velocity (RV) data indicated a wide-orbit massive companion. In 2020 westarted an RV campaign for the system with the main scientific goal tofollow-up this linear slope, and to put constraints on the orbital period ofthe companion. Furthermore, we aimed at refining the system parameters and wewanted to probe transit timing variations (TTVs) of XO-7b in order to searchfor long-term dynamical signs of the companion of XO-7b in theobserved-minus-calculated (O-C) data of mid-transit times. Apart from thediscovery RVs, we obtained and analyzed 20 follow-up RV observations and TESSphotometric data. The previously observed significant linear RV slope was notconfirmed with the follow-up RV data, where we detected only a marginal linearslope with the opposite trend. If the announced companion really exists, themost convincing explanation is that both RV datasets were collected near itsquadrature position. Based on the RVs we estimated the minimum orbital period,which is $P_\mathrm{orb,min,3} \gtrsim 7900 \pm 1660$ d, and the 'minimum'minimum mass of the companion, which is $(M_3 \sin i)_\mathrm{min} = 16.7 \pm3.5~\mathrm{M_{Jup}}$. We did not find significant evidence of the companion ofXO-7b in the O-C dataset of mid-transit times. We can again conclude that ifthe announced companion really exists, this is in agreement with previousresults that distant companions of exoplanets are only known by RV solutions.

Search for the wide-orbit massive companion of XO-7b in the follow-up radial-velocity and transit-timing data: no significant clues