  Reanalyzing contact binaries with space-based photometric data and
investigating possible parameter changes can yield accurate samples for
theoretical studies. We investigated light curve solutions and fundamental
parameters for twenty contact binary systems. The most recent Transiting
Exoplanet Survey Satellite (TESS) data is used to analyze. The target systems
in the investigation have an orbital period of less than 0.58 days. Light curve
solutions were performed using the PHysics Of Eclipsing BinariEs (PHOEBE)
Python code version 2.4.9. The results show that systems had various mass
ratios from q=0.149 to q=3.915, fillout factors from f=0.072 to f=0.566, and
inclinations from i=52.8deg to i=87.3deg. The effective temperature of the
stars was less than 7016 K, which was expected given the features of most
contact binary stars. Twelve of the target systems' light curves were
asymmetrical in the maxima, showing the O'Connell effect, and a starspot was
required for light curve solutions. The estimation of the absolute parameters
of the binary systems was presented using the a-P empirical relationship and
discussed. The orbital angular momentum (J_0) of the systems was calculated.
The positions of the systems were also depicted on the M-L, M-R, q-L_ratio,
M_tot-J_0, and T-M diagrams.
