  An important physical phenomenon that manifests itself during the inspiral of
two orbiting compact objects is the tidal deformation of each under the
gravitational influence of its companion. In the case of binary neutron star
mergers, this tidal deformation and the associated Love numbers have been used
to probe properties of dense matter and the nuclear equation of state.
Non-spinning black holes on the other hand have a vanishing (field) tidal Love
number in General Relativity. This pertains to the deformation of the
asymptotic gravitational field. In certain cases, especially in the late stages
of the inspiral phase when the black holes get close to each other, the source
multipole moments might be more relevant in probing their properties and the
No-Hair conjecture; contrastingly, these Love numbers do not vanish. In this
paper, we track the source multipole moments in simulations of several binary
black hole mergers and calculate these Love numbers. We present evidence that,
at least for modest mass ratios, the behavior of the source multipole moments
is universal.
