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The WASP-148 planetary system has a rare architecture with a transitingSaturn-mass planet on a tight orbit which is accompanied by a slightly moremassive planet on a nearby outer orbit. Using new space-born photometry andground-based follow-up transit observations and data available in literature,we performed modeling that accounts for gravitational interactions between bothplanets. Thanks to the new transit timing data for planet b, uncertainties oforbital periods and eccentricities for both planets were reduced relative topreviously published values by a factor of 3-4. Variation in transit timing hasan amplitude of about 20 minutes and can be easily followed-up with a 1-m classtelescopes from the ground. An approximated transit ephemeris, which accountsfor gravitational interactions with an accuracy up to 5 minutes, is provided.No signature of transits was found for planet c down to the Neptune-sizeregime. No other transiting companions were found down to a size of about 2.4Earth radii for interior orbits. We notice, however, that the regime ofterrestrial-size planets still remains unexplored in that system.

A Newtonian model for the WASP-148 exoplanetary system enhanced with TESS and ground-based photometric observations