Tail asymptotics for the bivariate skew normal

We derive the asymptotic rate of decay to zero of the tail dependence of the bivariate skew normal distribution under the equal-skewness condition α1=α2,=αα1=α2,=α, say. The rate depends on whether α>0α>0 or α<0α<0. For the lower tail, the latter case has rate asymptotically identical with the bivariate normal (α=0α=0), but has a different multiplicative constant. The case α>0α>0 gives a rate dependent on αα. The detailed asymptotic behaviour of the quantile function for the univariate skew normal is a key. This study is partly a sequel to our earlier one on the analogous situation for bivariate skew tt.