Cataclysmic Variables from Sloan Digital Sky Survey V -- the search for period bouncers continues

Understand

SDSS-V is carrying out a dedicated survey for white dwarfs, single and in binaries, and we report the analysis of the spectroscopy of cataclysmic variables (CVs) and CV candidates obtained during the final plug plate observations of SDSS.

• We identify eight new CVs, spectroscopically confirm 53 and refute eleven published CV candidates, and we report 21 new or improved orbital periods.
• Combined with previously published data, the orbital period distribution of the SDSS-V CVs does not clearly exhibit a period gap.
• This is consistent with previous findings that spectroscopically identified CVs have a larger proportion of short-period systems compared to samples identified from photometric variability.