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We report the discovery and characterisation of a deeply eclipsing AMCVn-system, Gaia14aae (= ASSASN-14cn). Gaia14aae was identified independentlyby the All-Sky Automated Survey for Supernovae (ASAS-SN; Shappee et al. 2014)and by the Gaia Science Alerts project, during two separate outbursts. A thirdoutburst is seen in archival Pan-STARRS-1 (PS1; Schlafly et al. 2012; Tonry etal. 2012; Magnier et al. 2013) and ASAS-SN data. Spectroscopy reveals a hot,hydrogen-deficient spectrum with clear double-peaked emission lines, consistentwith an accreting double degenerate classification. We use follow-up photometryto constrain the orbital parameters of the system. We find an orbital period of49.71 min, which places Gaia14aae at the long period extremum of theoutbursting AM CVn period distribution. Gaia14aae is dominated by the lightfrom its accreting white dwarf. Assuming an orbital inclination of 90 degreesfor the binary system, the contact phases of the white dwarf lead to lowerlimits of 0.78 M solar and 0.015 M solar on the masses of the accretor anddonor respectively and a lower limit on the mass ratio of 0.019. Gaia14aae isonly the third eclipsing AM CVn star known, and the first in which the WD istotally eclipsed. Using a helium WD model, we estimate the accretor's effectivetemperature to be 12900+-200 K. The three out-burst events occurred within 4months of each other, while no other outburst activity is seen in the previous8 years of Catalina Real-time Transient Survey (CRTS; Drake et al. 2009),Pan-STARRS-1 and ASAS-SN data. This suggests that these events might berebrightenings of the first outburst rather than individual events.

Total eclipse of the heart: The AM CVn Gaia14aae / ASSASN-14cn