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We present a novel Lyman alpha (Ly$\alpha$) radiative transfer code, SEURAT,where line scatterings are solved adaptively with the resolution of thesmoothed particle hydrodynamics (SPH). The radiative transfer methodimplemented in SEURAT is based on a Monte Carlo algorithm in which thescattering and absorption by dust are also incorporated. We perform standardtest calculations to verify the validity of the code; (i) emergent spectra froma static uniform sphere, (ii) emergent spectra from an expanding uniformsphere, and (iii) escape fraction from a dusty slab. Thereby we demonstratethat our code solves the Ly$\alpha$ radiative transfer with sufficientaccuracy. We emphasise that SEURAT can treat the transfer of Ly$\alpha$ photonseven in highly complex systems that have significantly inhomogeneous densityfields. The high adaptivity of SEURAT is desirable to solve the propagation ofLy$\alpha$ photons in the interstellar medium of young star-forming galaxieslike Ly$\alpha$ emitters (LAEs). Thus, SEURAT provides a powerful tool to modelthe emergent spectra of Ly$\alpha$ emission, which can be compared to theobservations of LAEs.

SEURAT: SPH scheme extended with ultraviolet line radiative transfer