If the script ends, the operating system frees the memory. So either your OS is corrupted or more likely your script never ends and stays as a defunct process. Try ps -aux to see all processes, top shows you only a part.

Other interesting OS commands you might have on your solaris: truss to trace the OS calls of your script, /usr/proc/bin/pmem to list memory usage, /usr/proc/bin/pfiles to list open files