Density Contour in the Equatorial Plane

Unequal mass irrotational binary; Rest-mass ratio = 0.925

Polytropic index n=1

Compactness of neutron star : Gm/Rc^2 = 0.159 vs 0.183

Initial orbital separation : r ~ 8.5 GM/c^2

White circle in the last stage : Apparent horizon

(633, 633, 317) grid point simulation; (121,121) region is shown