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We present 22 new transit observations of the exoplanets WASP-18Ab, WASP-19b,and WASP-77Ab, from the Transit Monitoring in the South (TraMoS) project. Wesimultaneously model our newly collected transit light curves with archivalphotometry and radial velocity data, to obtain refined physical and orbitalparameters. We include TESS light curves of the three exoplanets to perform anextended analysis of the variations in their transit mid-time (TTV) and torefine their planetary orbital ephemeris. We did not find significant $\rmTTV_{RMS}$ variations larger than 47, 65, and 86 seconds for WASP-18Ab,WASP-19b, and WASP-77Ab, respectively. Dynamical simulations were carried outto constrain the masses of a possible perturber. The observed RMS could beproduced by a perturber body with an upper limit mass of 9, 2.5, 11 and$4~M_{\oplus}$ in 1:2, 1:3, 2:1, and 3:1 resonances in the WASP-18Ab system. Inthe case of WASP-19b, companions with masses up to 0.26, 0.65, 1 and$2.8~M_{\oplus}$, in 1:2, 2:1, 3:1, and 5:3 resonances, produce the RMS. Andfor the WASP-77Ab system, a planet with mass between $1.5-9~M_{\oplus}$ in 1:2,1:3, 2:1, 2:3, 3:1, 3:5, 5:3 resonances. Comparing our results with RVvariations, we discard massive companions with $350~M_{\oplus}$ in 17:5resonance for WASP-18Ab, $95~M_{\oplus}$ in 4:1 resonance for WASP-19b and$105~M_{\oplus}$ in 5:2 resonance for WASP-77Ab. Finally, using a Lomb-Scargleperiod search we find no evidence of a periodic trend on our TTV data for thethree exoplanets.

TraMoS V. Updated ephemeris and multi-epoch monitoring of the hot Jupiters WASP-18Ab, WASP-19b, and WASP-77Ab