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The merger process of a binary black hole system can have a strong impact ona circumbinary disk. In the present work we study the effect of both centralmass reduction (due to the energy loss through gravitational waves) and apossible black hole recoil (due to asymmetric emission of gravitationalradiation). For the mass reduction case and recoil directed along the disk'sangular momentum, oscillations are induced in the disk which then modulate theinternal energy and bremsstrahlung luminosities. On the other hand, when therecoil direction has a component orthogonal to the disk's angular momentum, thedisk's dynamics are strongly impacted, giving rise to relativistic shocks. Theshock heating leaves its signature in our proxies for radiation, the totalinternal energy and bremsstrahlung luminosity. Interestingly, for cases wherethe kick velocity is below the smallest orbital velocity in the disk (a likelyscenario in real AGN), we observe a common, characteristic pattern in theinternal energy of the disk. Variations in kick velocity simply provide a phaseoffset in the characteristic pattern implying that observations of such asignature could yield a measure of the kick velocity through electromagneticsignals alone.

Perturbed disks get shocked. Binary black hole merger effects on accretion disks