For the target J2102-4145 observed with SOAR and ULTRACAM u_s, g_s, i_s, and r_s FT analysis on the residual light curve, obtained after subtracting the light curve fit generated using PHOEBE (details in Section 3.3). The SOAR and ULTRACAM data in u_s, g_s, i_s, and r_s bands were used, mirroring the approach undertaken for Figure B.3. However, in this case, a new PHOEBE model was applied without considering the Doppler beaming effect. This adjustment aimed to investigate and eliminate the possibility that the 1.4-hour signal observed with masked eclipses (see Figure B.2) was caused by the Doppler beaming effect.