Abstract
The precise planet ephemeris can provide useful reference for future investigations and observations. With the continuous data returned by NASA Transiting Exoplanet Survey Satellite (TESS), we are able to continuously refine the planets transits. We analyzed the data sent back from TESS as well as other previous data using Mandel & Agol model and Markov Chain Monte Carlo (MCMC) ensemble sampler to obtain the best-fit planetary parameters of 24 hot Jupiters. Our data leads to a detection of orbital-decay for HATS-1b and WASP-19b and each has a decreasing rate of dP/dt=-22.777.49 ms yr^(-1) and dP/dt=-2.950.51 ms yr^(-1) . HATS-1, was detected for the first time to have an orbital decay trend. When analyzing data plots, we came across some special features in light curves, such as periodic smaller dips in the system of WASP-24, leading to the detection of a possible new planet. We hope our findings will provide helpful references for future studies and observations.
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