Gauthier scored three goals on five shots, with two tallies on the power play, in Sunday's 6-3 win over the Senators.
Gauthier has a trio of multi-goal games games this season. Sunday's hat trick also saw him collect his first even-strength tally of the campaign. He's up to seven goals, 12 points, 53 shots on net, 12 hits and a minus-6 rating through 13 appearances.