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We demonstrate tidal detonation during a tidal disruption event (TDE) of ahelium (He) white dwarf (WD) with $0.45M_\odot$ by an intermediate mass blackhole (IMBH) by extremely high-resolution simulations. Tanikawa et al. (2017)have showed tidal detonation in previous studies results from unphysicalheating due to low-resolution simulations, and such unphysical heating occursin 3-dimensional (3D) smoothed particle hydrodynamics (SPH) simulations evenwith $10$ million SPH particles. In order to avoid such unphysical heating, weperform 3D SPH simulations up to $300$ million SPH particles, and 1D meshsimulations using flow structure in the 3D SPH simulations for 1D initialconditions. The 1D mesh simulations have higher resolution than the 3D SPHsimulations. We show tidal detonation occurs, and confirm this result isperfectly converged with different space resolution in both 3D SPH and 1D meshsimulations. We find detonation waves independently arises in leading parts ofthe WD, and yield large amounts of $^{56}$Ni. Although detonation waves are notgenerated in trailing parts of the WD, the trailing parts receive detonationwaves generated in the leading parts, and leave large amounts of Si groupelements. Eventually, this He WD TDE would synthesize $^{56}$Ni of$0.30M_\odot$ and Si group elements of $0.08M_\odot$, and could be observed asa luminous thermonuclear transient comparable to type Ia supernovae.

High-resolution hydrodynamic simulation of tidal detonation of a helium white dwarf by an intermediate mass black hole