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Magnetically gated accretion has emerged as a proposed mechanism forproducing extremely short, repetitive bursts of accretion onto magnetized whitedwarfs in intermediate polars (IPs), but this phenomenon has not been detectedpreviously in a confirmed IP. We report the 27-day TESS light curve of V1025Cen, an IP that shows a remarkable series of twelve bursts of accretion, eachlasting for less than six hours. The extreme brevity of the bursts and theirshort recurrence times (~1-3 days) are incompatible with the dwarf-novainstability, but they are natural consequences of the magnetic gating mechanismdeveloped by Spruit & Taam to explain the Type II bursts of the accretingneutron star known as the Rapid Burster. In this model, the accretion flowpiles up at the magnetospheric boundary and presses inward until it coupleswith the star's magnetic field, producing an abrupt burst of accretion. Aftereach burst, the reservoir of matter at the edge of the magnetosphere isreplenished, leading to cyclical bursts of accretion. A pair of recent studiesapplied this instability to the suspected IPs MV Lyr and TW Pic, but themagnetic nature of these two systems has not been independently confirmed. Incontrast, previous studies have unambiguously established the white dwarf inV1025 Cen to be significantly magnetized. The detection of magnetically gatedbursts in a confirmed IP therefore validates the extension of the Spruit & Taaminstability to magnetized white dwarfs.

Rapid bursts of magnetically gated accretion in the intermediate polar V1025 Cen