TPTK se fait 3 bet au flop

NL Texas Hold'em $0.10/$0.25
Party - 6 players
Converted with HandConverter.fr

Stacks:
UTG ($30.78) - VPIP: 18, PFR: 14, 3B: 2, AF: 2.3, Hands: 581
MP ($20.88) - VPIP: 33, PFR: 3, 3B: 0, AF: 6.0, Hands: 36
CO ($8.18) - VPIP: 55, PFR: 0, 3B: 0, AF: 3.0, Hands: 29
BTN ($25.55) - VPIP: 20, PFR: 8, 3B: 0, AF: 1.1, Hands: 285
SB - Hero ($50.44)
BB ($19.50) - VPIP: 37, PFR: 13, 3B: 0, AF: 3.0, Hands: 38

Preflop: ($0.35, 6 players) Hero is SB with A:h K:c
2 folds, CO calls $0.25, BTN raises $1.00, Hero raises $3.15, 2 folds, BTN calls $2.25

Flop: 8:h T:s A:c ($7, 2 players)
Hero bets $3.50, BTN raises $8.52, Hero ???