The Whitey Bulger biopic shot in Boston last summer is officially called “Black Mass,” the studio announced Friday. It’s hardly a surprise considering the film, directed by Scott Cooper and starring Johnny Depp as the notorious South Boston mob boss, is based on the book “Black Mass: The True Story of an Unholy Alliance Between the FBI and the Irish Mob,” written by former Globe staffers Dick Lehr and Gerard O’Neill. The movie, which also stars Joel Edgerton, Benedict Cumberbatch, Jesse Plemons, Kevin Bacon, Rory Cochrane, Dakota Johnson, and Julianne Nicholson, opens Sept 18. . . . Meanwhile, “Adult Beginners,” the indie comedy produced by Boston’s Paul Bernon, will open next week. Bernon and his wife, Ashley, attended the Hollywood premiere the other night along with cast members Nick Kroll and Rose Byrne. The movie is about a failed tech investor who moves in with his sister and her husband, and baby-sits their son.