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Up to now, WASP-12b is the only hot Jupiter confirmed to have a decayingorbit. The case of WASP-43b is still under debate. Recent studies preferred orruled out the orbital decay scenario, but further precise transit timingobservations are needed to definitively confirm or refute the period change ofWASP-43b. This possibility is given by the Transiting Exoplanet SurveySatellite (TESS) space telescope. In this work we used the available TESS data,multi-color photometry data obtained with the Multicolor Simultaneous Camerafor studying Atmospheres of Transiting exoplanets 2 (MuSCAT2) and literaturedata to calculate the period change rate of WASP-43b and to improve itsprecision, and to refine the parameters of the WASP-43 planetary system. Basedon the observed-minus-calculated data of 129 mid-transit times in total,covering a time baseline of about 10 years, we obtained an improved periodchange rate of $\dot{P} = -0.6 \pm 1.2$ ms yr$^{-1}$ that is consistent with aconstant period well within $1\sigma$. We conclude that new TESS and MuSCAT2observations confirm no detection of WASP-43b orbital decay.

Is the orbit of the exoplanet WASP-43b really decaying? TESS and MuSCAT2 observations confirm no detection