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The supersoft X-ray and optical transient ASASSN-16oh has been interpreted byMaccarone et al. (2019) as having being induced by an accretion event on amassive white dwarf, resembling a dwarf nova super-outburst. These authorsargued that the supersoft X-ray spectrum had a different origin than in anatmosphere heated by shell nuclear burning, because no mass was ejected. Wefind instead that the event's timescale and other characteristics are typicalof non-mass ejecting thermonuclear runaways, as already predicted by Shara etal. (1977) and the extensive grid of nova models by Yaron et al. (2005). Wesuggest that the low X-ray and bolometric luminosity in comparison to thepredictions of the models of nuclear burning are due to an optically thickaccretion disk, hiding most of the white dwarf surface. If this is the case, wecalculated that the optical transient can be explained as a non-ejectivethermonuclear event on a WD of $\simeq$1.1M$_\odot$ accreting at the rate of$\simeq3.5{-}5{\times}10^{-7}$M$_\odot$yr$^{-1}$. We make predictions thatshould prove whether the nature of the transient event was due to thermonuclearburning or to accretion; observational proof should be obtained in the next fewyears, because a new outburst should occur within $\simeq$10-15 years of theevent.

The supersoft X-ray transient ASASSN-16oh as a thermonuclear runaway without mass ejection