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White dwarf-white dwarf (WD-WD) mergers may lead to type Ia supernovaeevents. Thompson (2011) suggested that many such binaries are produced inhierarchical triple systems. The tertiary induces eccentricity oscillations inthe inner binary via the Kozai-Lidov mechanism, driving the binary to higheccentricities, and significantly reducing the gravitational wave mergertimescale (T_GW) over a broad range of parameter space. Here, we investigatethe role of tidal forces in these systems. We show that tidal effects areimportant in the regime of moderately high initial relative inclination betweenthe inner binary and the outer tertiary. For 85 < i_0 < 90 degrees (prograde)and 97 < i_0 < 102 degrees (retrograde), tides combine with GW radiation todramatically decrease T_GW. In the regime of high inclinations between 91 < i_0< 96 degrees, the inner binary likely suffers a direct collision, as in thework of Katz & Dong (2012) and tidal effects do not play an important role.

On WD-WD Mergers in Triple Systems: The Role of Kozai Resonance with Tidal Friction