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We report the discovery using data from the Swift Burst Alert Telescope (BAT)of superorbital modulation in the wind-accretion supergiant high-mass X-raybinaries 4U 1909+07 (= X 1908+075), IGR J16418-4532, and IGR J16479-4514.Together with already known superorbital periodicities in 2S 0114+650 and IGRJ16493-4348, the systems exhibit a monotonic relationship between superorbitaland orbital periods. These systems include both supergiant fast X-raytransients (SFXTs) and classical supergiant systems, and have a range ofinclination angles. This suggests an underlying physical mechanism which isconnected to the orbital period. In addition to these sources with cleardetections of superorbital periods, IGR J16393-4643 (= AX J16390.4-4642) isidentified as a system that may have superorbital modulation due to thecoincidence of low-amplitude peaks in power spectra derived from BAT, RXTE PCA,and INTEGRAL light curves. 1E 1145.1-6141 may also be worthy of furtherattention due to the amount of low-frequency modulation of its light curve.However, we find that the presence of superorbital modulation is not auniversal feature of wind-accretion supergiant X-ray binaries.

Superorbital Periodic Modulation in Wind-Accretion High-Mass X-ray Binaries from Swift BAT Observations