A Step towards Unveiling the Nature of Three Cataclysmic Variables: LSCam, V902 Mon, and SWIFT J0746.3-1608
Speakers: Emanuele Dondoglio (Università degli Studi di Padova)
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 SurveySatellite (TESS). Our analysis of LS Cam observations hints the presence of a superorbital period of?4.025?0.007 d along withnegative and positive superhump periods of?3.30 h and 3.70 h, respectively. These results can be explained as an interactionof nodal and apsidal precession of the accretion disc with orbital motion. For the other two sources, V902 Mon and SWIFTJ0746.3-1608, we have found evidence of a beat period of 2387.0?0.6 s and 2409.5?0.7 s, respectively, which were not found inearlier studies. Our results presented in this study indicate the change in the accretion mode during the entire observing period forboth sources. For V902 Mon, an apparent orbital period derivative of (6.09?0.60)?1010was also found. Moreover, the secondharmonic of orbital frequency dominates the power spectrum of SWIFT J0746.3-1608, suggestive of ellipsoidal modulationof the secondary star. Present analyses suggest that LS Cam could be a superhumping CV whereas V902 Mon and SWIFTJ0746.3-1608 are likely to be variable disc-overflow accreting intermediate polars