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The possibility that long tidal tails formed during compact object mergersmay power optical transients through the decay of freshly synthesized r-processmaterial is investigated. Precise modeling of the merger dynamics allows for arealistic determination of the thermodynamic conditions in the ejected debris.The results of hydrodynamic and full nuclear network calculations are combinedto calculate the resultant r-process abundances and the heating of the materialby their decays. The subsequent homologous structure is mapped into a radiativetransfer code to synthesize emergent model light curves and determine how theirproperties (variability and color evolution) depend on the mass ratio andorientation of the merging binary. The radiation emanating from the ejecteddebris, though less spectacular than a typical supernova, should be observablein transient surveys and we estimate the associated detection rates. The casefor (or against) compact object mergers as the progenitors of short gamma-raybursts can be tested if such electromagnetic transients are detected (or not)in coincidence with some bursts, although they may be obscured by on-axisafterglows.

Electromagnetic Transients Powered by Nuclear Decay in the Tidal Tails of Coalescing Compact Binaries