Abstract
Abstract We obtained spectra of ASASSN-V J205543.90+240033.5 (J2055), a system that shows photometric variations similar to the white dwarf (WD) pulsar AR Scorpii. Our spectra display a continuum rising steeply toward the blue as well as an array of emission lines. Resolved Balmer and Paschen lines are seen with Hα and Hβ having central absorption features. The strongest lines are unresolved C ii, C iii, and N iii as well as doubly ionized helium. The spectra are similar to that of YY Hya, and suggest that J2055 is a post-common envelope binary consisting of a hot compact star irradiating the face of a secondary of unknown spectral type. Velocity variations detected from the emission lines confirm the binary nature of J2055. The origin of the 10 minutes photometric variation remains uncertain.
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