Perpetual barrier options in jump-diffusion models

We present a closed form solution to the perpetual American double barrier call option problem in a model driven by Brownian motion and a compound Poisson process with exponential jumps. The method of proof is based on reducing the inital irregular optimal stopping problem to an integro-differential free-boundary problem and solving the latter by using continuous and smooth fit. The obtained solution of the nontrivial free-boundary problem gives the possibility to observe some special analytic properties of the value function at the optimal stopping boundaries. -- American double barrier options ; optimal stopping problem ; jump-diffusion model ; integro-differential free-boundary problem ; continuous and smooth fit ; It^o-Tanaka-Meyer formula