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We study the radioactively-powered transients produced by accretion diskwinds following a compact object merger. Starting with the outflows generatedin two-dimensional hydrodynamical disk models, we use wavelength-dependentradiative transfer calculations to generate synthetic light curves and spectra.We show that the brightness and color of the resulting kilonova transientscarry information about the merger physics. In the regions of the wind whereneutrino irradiation raises the electron fraction to Ye > 0.25, r-processnucleosynthesis halts before producing high-opacity, complex ions (thelanthanides). The kilonova light curves thus show two distinct components: abrief (~2 day) blue optical transient produced in the outer lanthanide-freeejecta, and a longer (~10 day) infrared transient produced in the inner,lanthanide line-blanketed region. Mergers producing a longer-lived neutronstar, or a more rapidly spinning black hole, have stronger neutrinoirradiation, generate more lanthanide-free ejecta, and are optically brighterand bluer. At least some optical emission is produced in all disk wind models,which should enhance the detectability of electromagnetic counterparts togravitational wave sources. However, the presence of even a small amount(10^{-4} Msun) of overlying, neutron-rich dynamical ejecta will act as a"lanthanide-curtain", obscuring the optical wind emission from certain viewingangles. Because the disk outflows have moderate velocities (~10,000 km/s),numerous resolved line features are discernible in the spectra, distinguishingdisk winds from fast-moving dynamical ejecta, and offering a potentialdiagnostic of the detailed composition of freshly produced r-process material.

Kilonova Light Curves from the Disk Wind Outflows of Compact Object Mergers