Speaker
Description
SRGt 062340.2-265751 was discovered during eRASS2, where a factor two increase in X-ray flux was detected compared to eRASS1. Optical spectroscopy of its G=12.5 counterpart identified the source as a cataclysmic variable, while archival X-ray observations and optical photometry revealed significant variability and potential periodicities. A tentative orbital period of 3.941 hours was derived from TESS data; however, this periodicity was absent in subsequent observations conducted two years later. The source has been proposed to be an X-ray under-luminous intermediate polar, an over-luminous non-magnetic cataclysmic variable, or potentially a new type of cataclysmic variable. Its properties remain puzzling, but additional X-ray observations could help to identify possible spin, beat and orbital periods, providing further insight into the nature of the system. In April 2023, we observed the source with XMM-Newton for 44 ksec. Here, we present a preliminary analysis of these new X-ray follow-up observations, report our initial findings in the search for periodicities, and discuss their implications for the various proposed scenarios.
