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Binary black holes (BBHs) appear to be widespread and are able to mergethrough the emission of gravitational waves, as recently illustrated by LIGO.The spin of the BBHs is one of the parameters that LIGO can infer from thegravitational wave signal and can be used to constrain their production site.If BBHs are assembled in stellar clusters they are likely to interact withstars, which could occasionally lead to a tidal disruption event (TDE). When aBBH tidally disrupts a star it can accrete a significant fraction of thedebris, effectively altering the spins of the BHs. Therefore, althoughdynamically formed BBHs are expected to have random spin orientations, tidalstellar interactions can significantly alter their birth spins both indirection and magnitude. Here we investigate how TDEs by BBHs can affect theproperties of the BH members as well as exploring the characteristics of theresulting electromagnetic signatures. We conduct hydrodynamic simulations witha Lagrangian Smoothed Particle Hydrodynamics code of a wide range ofrepresentative tidal interactions. We find that both spin magnitude andorientation can be altered and temporarily aligned or anti-aligned throughaccretion of stellar debris, with a significant dependence on the mass ratio ofthe disrupted star and the BBH members. These tidal interactions feed materialto the BBH at very high accretion rates, with the potential to launch arelativistic jet. The corresponding beamed emission is a beacon to an otherwisequiescent BBH.

Tidal Disruptions of Stars by Binary Black Holes: Modifying the Spin Magnitudes and Directions of LIGO Sources in Dense Stellar Environments