We provide the photometric time series for transits of HAT-P-4 b, HAT-P-10 b, HAT-P-12 b, HAT-P-17 b, HAT-P-19 b, HAT-P-32 b, HAT-P-44 b, Qatar-6 b, TrES-4 b, and WASP-48 b acquired with the instruments: the 2.0m Liverpool Telescope (LT2.0) at Observatorio del Roque de los Muchachos (La Palma, Spain), the 1.5m Ritchey-Chretien Telescope (OSN1.5) at the Sierra Nevada Observatory (OSN, Spain), the 1.2m Cassegrain telescope (TRE1.2) at the Michael Adrian Observatory (Trebur, Germany), the 0.9m Ritchey-Chretien Telescope (OSN0.9) at the OSN, the 0.9/0.6m Schmidt Teleskop Kamera (JENA0.9) at the University Observatory Jena (Germany), and the 0.6m Cassegrain telescope (PIW0.6) at the Institute of Astronomy of the Nicolaus Copernicus University in Torun (Poland). The data were collected between 2015 and 2021. The details of observations and data processing are given in the source paper. We also provide details on the out-of-transit monitoring for four targets: HAT-P-10, HAT-P-17, HAT-P-44, and Qatar-6. The data were collected with the PIW0.6 telescope between 2016 and 2019. Further information is given in the source paper. We also provide the new mid-transit times determined from our ground-based light curves and from the TESS photometric time series. The re-determined mid-transit times from literature data are also given. For more details, see the paper.

The loneliness of hot Jupiters supports the high-eccentricity migration as a primary path leading to the formation of systems with those planets stripped of any close-in planetary companions. Here we present the null results of searches for low-mass planets close to hot Jupiters in 10 planetary systems: HAT-P-4, HAT-P-10, HAT-P-12, HAT-P-17, HAT-P-19, HAT-P-32, HAT-P-44, Qatar-6, TrES-4, and WASP-48. We employed multi-sector time-series photometry from the Transiting Exoplanet Survey Satellite enhanced with new ground-based transit light curves to determine the sizes of hypothetical planets that might still avoid being detected. We redetermined transit parameters for the known hot Jupiters using a homogeneous approach. We refuted transit timing variations for HAT-P-12 b, claimed recently in the literature. The transit timing data permitted us to place tighter constraints on third bodies in HAT-P-19 and HAT-P-32 systems detected in Doppler measurements. We also study four multi-periodic pulsating variable stars in the field around HAT-P-17.

Financial support from the Severo Ochoa grant CEX2021-001131-S funded by MCIN/AEI/ 10.13039/501100011033

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