IPs
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Low StatesSome IPs have shown occasional low states in archival plate photometry. However, low states appeared to be rare and few, if any, detailed observations of IPs in low states were published for many years. This has changed, over the last several years, as FO Aqr is seen to go into the low state several times. In addition, there are examples of new IPs whose identification was delayed because they were originally observed in the low state. This probably was the case with Swift J052522.48+241331.8, which was originally announced as a probable BAT transient. The history of its BAT count rate since then suggests it was in a low state at the beginning of the Swift mission. Even with the increased number of observations, IPs probably go into the low state less frequently than AM Her type systems. A comparison of statistics among AM Her type systems, IPs, as well as VY Scl-type (non-magnetic) CVs would be useful in understanding the origin and the physics of low states of CVs. When an IP goes into the low state, the accretion torque obviously must decrease. In the case of FO Aqr, there is an apparent correlation between the recent low states and the recent episode of spin-down of the white dwarf (see the spin period history page). With just one example however, it may not be wise to jump to a conclusion.
References
FO Aqr
Other confirmed IPs
IP Candidate
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