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It is crucial to determine masses and radii of extrasolar planets with highprecision to have constraints on their chemical composition, internal structureand thereby their formation and evolution. In order to achieve this goal, weapply the defocus technique in the observations of selected planetary systemswith the 1 m Turkish telescope T100 in TUBITAK National Observatory (TUG). Withthis contribution, we aim to present preliminary analyses of transit lightcurves of the selected exoplanets KELT-3b, HAT-P-10b/WASP-11b, HAT-P-20b, andHAT-P-22b, observed with this technique using T100.

Defocused Observations of Selected Exoplanet Transits with T100 in TUBITAK National Observatory of Turkey (TUG)