  WASP-43 b is one of the most important candidates for detecting an orbital
decay. We investigate pieces of evidence for this expectation as variations in
its transit timings, based on the ground and space observations. The data set
includes the transit observations at the TUBITAK National Observatory of Turkey
and Transiting Exoplanet Survey Satellite (TESS). We present a global model of
the system, based on the most precise photometry from space, ground, and
archival radial velocity data. Using the homogenized data set and modeled light
curves, we measure the mid-transit times for WASP-43 b. Our analysis agrees
with a linear ephemeris for which we refine the light elements for future
observations of the system. However, there is a negative difference between the
transit timings derived from TESS data in two sectors (9 and 35) and a hint of
an orbital period decrease in the entire data set. Both findings are
statistically insignificant due to the short baseline of observations, which
prevents us from drawing firm conclusions about the orbital decay of this
ultra-short-period planet. However, assuming the effect of this decrease of the
period in the planet's orbit, we derive a lower limit for the reduced tidal
quality factor as Q'_* > (4.01 +_ 1.15). 10^5 from the best-fitting quadratic
function. Finally, we calculate a probable rotational period for this system as
7.52 days from the out-of-transit flux variation in the TESS light curves due
to spot modulation.
