Revealing the nature of the mysterious outburst of the classical nova V1047 Cen.
Authors:
Augustin Skopal and Natalia Shagatova
Image & caption:
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Image caption::
Left: Observed (magenta) and modeled (black line) spectral energy distribution (SED) of V1047 Cen on selected days during its 2019 outburst. Right: Evolution of the V/I light curve (panel (a)) and
SED model parameters, luminosity (b), radius (c), temperature (d), and mass-loss rate (e) throughout the 2019 outburst of V1047 Cen. All of these characteristics are typical of a Z And type outburst.
Description:
In 2019, the classical nova V1047 Cen (Nova Centauri 2005) underwent a mysterious, more than 400-day-long explosion, the nature of which was not clarified, and therefore designated as a new type of stellar explosion in cataclysmic variable stars (CVs – interacting binaries with an orbital period of several hours). In our study, we demonstrated that the 2019 explosion of V1047 Cen is of the “Z And” type – a characteristic type that has been observed exclusively in symbiotic stars (SySt – interacting binaries with orbital periods of several years). We proved our claim by modeling the spectral energy distribution in the near-ultraviolet to near-infrared (see the figure). We have shown that after a classical nova explosion, a "Z And" type explosion can occur not only in SySt but also in CVs, when the accretion-powered system changes to a nuclear-powered system due to the reaction of the donor to the nova explosion. This result thus challenged the typical behavior of CVs after a nova explosion and suggested a new path of stellar evolution that terminates with a Type Ia supernova explosion.
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