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We have studied the shadow of a disformal Kerr black hole with an extradeformation parameter, which belongs to non-stealth rotating solutions inquadratic Degenerate Higher Order Scalar Tensor (DHOST) theory. Our result showthat the size of the shadow increases with the deformation parameter for theblack hole with arbitrary spin parameter. However, the effect of thedeformation parameter on the shadow shape depends heavily on the spin parameterof black hole and the sign of the deformation parameter. The change of theshadow shape becomes more distinct for the black hole with the more quicklyrotation and the more negative deformation parameter. Especially, for thenear-extreme black hole with negative deformation parameter, there exist a"pedicel"-like structure appeared in the shadow, which increases with theabsolute value of deformation parameter. The eyebrow-like shadow and theself-similar fractal structures also appear in the shadow for the disformalKerr black hole in DHOST theory. These features in the black hole shadoworiginating from the scalar field could help us to understand the non-stealthdisformal Kerr black hole and quadratic DHOST theory.

Shadow of a disformal Kerr black hole in quadratic DHOST theories