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Pre-main sequence (PMS) binaries are surrounded by circumbinary disks fromwhich matter falls onto both components. The material dragged from thecircumbinary disk flows onto each star through independent streams channelledby the variable gravitational field. The action of the bar-like potential ismost prominent in high eccentricity systems made of two equal mass stars. AKSco is a unique PMS system composed of two F5 stars in an orbit with e=0.47.Henceforth, it is an ideal laboratory to study matter infall in binaries andits role in orbit circularization. In this letter, we report the detection of a1.3mHz ultra low frequency oscillation in the ultraviolet light curve atperiastron passage. This oscillation last 7 ks being most likely fed by thegravitational energy released when the streams tails spiralling onto each starget in contact at periastron passage enhancing the accretion flow; this unveilsa new mechanism for angular momentum loss during pre-main sequence evolutionand a new type of interacting binary.

Evidence of accretion triggered oscillations in the pre-main-sequence interacting binary AK Sco