  Uninterrupted observations from space-borne telescopes provide the
photometric precision that is required to detect shallow transits of small
planets missed by ground-based surveys. We used data from the Transiting
Exoplanet Survey Satellite (TESS) to search for nearby planetary companions in
12 planetary systems with hot Jupiters: HD 2685, Qatar-10, WASP-4, WASP-48,
WASP-58, WASP-91, WASP-120, WASP-121, WASP-122, WASP-140, XO-6, and XO-7. We
also applied the transit timing method based on homogeneously determined
mid-transit times in order to search for non-transiting companions that could
gravitationally perturb the already known planets. We found no additional
planets in those systems down to the regime of sub-Neptunian globes. This
negative result is in line with statistical studies, supporting the
high-eccentricity migration as a pathway of the investigated giant planets to
the tight orbits observed today.
