CV eROSITA-enhanced multi-wavelength cat.

This brings the population of confirmed period-bouncers to 24 systems, corresponding to a ~40% increase. Our "scorecard" correctly assigns high scores to the already confirmed period-bouncers in our literature catalog and it identifies 80 additional strong period-bounce candidates present in the literature that have not been classified as such. We established two selection cuts based on the X-ray-to-optical flux ratio (-1.21<=log(Fx/Fopt)<=0) and the typical X-ray luminosity (log(Lx,bol)<=30.4[erg/s]) observed from the 8 already confirmed period-bouncers with eROSITA data.

These X-ray selection cuts led to the categorization of 5 systems as new period-bouncers, increasing their population number to 22 systems. Our multi-wavelength catalog of cataclysmic variables around the period minimum compiled from the literature together with X-ray data from eROSITA resulted in a ~30% increase in the population of period-bouncers. Both the catalog and "scorecard" that we constructed will aid in future searches for new period-bounce candidates with the goal of resolving the discrepancy between the predicted high number of period-bouncers and the low number of these systems that have been observed to date.