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We report the occurrence of a deep low state in the eclipsing short-periodcataclysmic variable IR Com, lasting more than two years. Spectroscopy obtainedin this state shows the system as a detached white dwarf plus low-masscompanion, indicating that accretion has practically ceased. The spectral typeof the companion derived from the SDSS spectrum is M6-7, somewhat later thanexpected for the orbital period of IR Com. Its radial velocity amplitude,K_2=419.6+-3.4 km/s, together with the inclination of 75-90deg implies0.8Msun<Mwd<1.0Msun. We estimate the white dwarf temperature to be ~15000K, andthe absence of Zeeman splitting in the Balmer lines rules out magnetic fieldsin excess of ~5 MG. IR Com still defies an unambiguous classification, inparticular the occurrence of a deep, long low state is so far unique amongshort-period CVs that are not strongly magnetic.

Spectroscopy of the enigmatic short-period cataclysmic variable IR Com in an extended low state