Abstract:
We have carried out detailed time-resolved timing analyses of three cataclysmic variables (CVs) namely LS Cam, V902 Mon,
and SWIFT J0746.3-1608, using the long-baseline, high-cadence optical photometric data from the Transiting Exoplanet Survey
Satellite. Our analysis of LS Cam observations hints the presence of a superorbital period of ∼4.025 ± 0.007 d along with
negative and positive superhump periods of ∼3.30 and 3.70 h, respectively. These results can be explained as an interaction
of nodal and apsidal precession of the accretion disc with orbital motion. For the other two sources, V902 Mon and SWIFT
J0746.3-1608, we have found evidence of a beat period of 2387.0 ± 0.6 and 2409.5 ± 0.7 s, respectively, which were not found
in earlier studies. Our results presented in this study indicate the change in the accretion mode during the entire observing period
for both sources. For V902 Mon, an apparent orbital period derivative of (6.09 ± 0.60) × 10−10 was also found. Moreover,
the second harmonic of orbital frequency dominates the power spectrum of SWIFT J0746.3-1608, suggestive of ellipsoidal
modulation of the secondary star. Present analyses suggest that LS Cam could be a superhumping CV, whereas V902 Mon and
SWIFT J0746.3-1608 are likely to be variable disc-overflow accreting intermediate polars.
