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We suggest "tidal double detonation": a new mechanism for a thermonuclearexplosion of a white dwarf (WD) induced by a tidal disruption event (TDE).Tidal detonation is also a WD explosion induced by a TDE. In this case, helium(He) and carbon-oxygen (CO) detonation waves incinerate He~WD and CO~WD,respectively. On the other hand, for tidal double detonation, He detonation isfirst excited in the He shell of a CO~WD, and drives CO detonation in the COcore. We name this mechanism after the double detonation scenario in thecontext of type Ia supernovae. In this paper, we show tidal double detonationoccurs in shallower encounter of a CO~WD with an intermediate mass black hole(IMBH) than simple tidal detonation, performing numerical simulations forCO~WDs with $0.60M_\odot$ with and without a He shell. We expect tidal doubledetonation spreads opportunity to WD~TDEs illuminating IMBHs.

Tidal double detonation: a new mechanism for a thermonuclear explosion of a white dwarf induced by a tidal disruption event