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• W4296457203 endingPage "145" @default.
• W4296457203 startingPage "145" @default.
• W4296457203 abstract "Classical supersoft X-ray sources (SSSs) are understood as close binary systems in which a massive white dwarf (WD) accretes from its companion at rates sustaining steady hydrogen burning on its surface generating bolometric luminosities of $10^{36}-2times10^{38}$ erg/s. Here, we perform for the first time the global supersoft X-rays to near-infrared (NIR) spectral energy distribution (SED) for the brightest SSSs in LMC and SMC. We test a model in which the ultraviolet--NIR is dominated by the emission from a compact (unresolved) circumstellar nebula represented by the ionized gas out-flowing from the SSS. The SED models correspond to luminosities of SSSs a few times $10^{38}-10^{39}$ erg/s, radiating at blackbody temperatures of $approx 3times 10^{5}$ K, and indicate nebular continuum, whose emission measure of $gtrsim 2times10^{60}$ cm$^{-3}$ corresponds to a wind mass-loss at rates $gtrsim 2times 10^{-6}$ $M_{odot},{rm yr}^{-1}$. Such extreme parameters suggest that the brightest SSSs could be unidentified optical novae in a post-nova SSS state sustained at a high long-lasting luminosity by resumed accretion, possibly at super-Eddington rates. New observations and theoretical multiwavelength modeling of the global SED of SSSs are needed to reliably determine their parameters, and thus understand their proper stage in stellar evolution." @default.
• W4296457203 created "2022-09-20" @default.
• W4296457203 creator A5029409855 @default.
• W4296457203 date "2022-09-19" @default.
• W4296457203 modified "2023-09-30" @default.
• W4296457203 title "Multiwavelength Modeling the SED of Luminous Supersoft X-Ray Sources in Large Magellanic Cloud and Small Magellanic Cloud" @default.
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