Disk eccentricity (left plot) for different values of the binary eccentricity e_b. The average of e_d is displayed after 70 binary revolutions, and time-averaging is done over 20 revolutions. For comparison, we also depict the corresponding values of e_d for isothermal disks with same binary configurations (Marzari et al. 2009). In the right plot, we show the disk size for different values of e_b, more specifically the semi-major axis of the ellipse that most closely fits the disk density at a level Σ = 10^-6 (code units).