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The recurrent nova RS Ophiuchi, one of the candidates for Type Ia supernovaprogenitors, underwent the sixth recorded outburst in February 2006. We reporta complete light curve of supersoft X-ray that is obtained for the first time.A numerical table of X-ray data is provided. The supersoft X-ray flux emergesabout 30 days after the optical peak and continues until about 85 days when theoptical flux shows the final decline. Such a long duration of supersoft X-rayphase can be naturally understood by our model in which a significant amount ofhelium layer piles up beneath the hydrogen burning zone during the outburst,suggesting that the white dwarf mass is effectively growing up. We haveestimated the white dwarf mass in RS Oph to be 1.35 \pm 0.01 M_\sun and itsgrowth rate to be about (0.5-1) \times 10^{-7} M_\sun yr^{-1} in average.

Supersoft X-ray Light Curve of RS Oph -- The White Dwarf Mass is Now Increasing