Maine Scallop Gratin

1 1/2 pounds Maine day boat scallops¼ cup cream cheese (softened)¼ cup White Wine1 lemon (juiced)1/4 teaspoon kosher salt1/8 teaspoon coarse ground black pepper1 tablespoon fresh tarragon (chopped)1/4 cup Parmesan cheese (shaved)1 pinch cayenne pepper (optional (to...