Can you rechill champagne

. . . only if you wish to completely de-carbonate it. Warm beverages can hold less dissolved carbon dioxide than cold ones. A warm bottle of bubbly won't be bubbly for long. The wine maker is rolling over in his grave -- if he's dead. If he's alive, he'll just be pissed off. When you open a bottle of Champagne or some other sparkling wine, like Prosecco, finish it. You'll be glad you did. Or you won't be upset that you didn't. Either one.