| 1. |
- Kosenko, D. I., et al.
(författare)
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Time-dependent thermal X-ray afterglows from GRBS
- 2004
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Ingår i: Advances in Space Research. - : Elsevier BV. - 0273-1177 .- 1879-1948. ; 34, s. 2705-2710
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Tidskriftsartikel (refereegranskat)abstract
- Time-dependent thermal X-ray spectra are calculated from physically plausible conditions around GRB. It is shown that account for time-dependent ionization processes strongly affects the observed spectra of hot rarefied plasma. These calculations may provide an alternative explanation to the observed X-ray lines of early GRBs afterglows (such as GRB 011211). Our technique will allow one to obtain independent constraints on the GRB collimation angle and on the clumpiness of circumstellar matter.
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| 2. |
- Kosenko, D. I., et al.
(författare)
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X-ray emission of young SN Ia remnants as a probe for an explosion model
- 2004
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Ingår i: Advances in Space Research. - : Elsevier BV. - 0273-1177 .- 1879-1948. ; 33, s. 392-397
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Tidskriftsartikel (refereegranskat)abstract
- We present results of hydrodynamical simulations of young supernova remnants. To model the ejecta, we use several models (discussed in the literature) of type Ia supernova explosions with different abundances. Our hydro models are one-dimensional and spherically symmetrical, but they take into account ionization kinetics with all important processes. We include detailed calculations for the X-ray emission, allowing for time-dependent ionization and recombination. In particular, we compare the computed X-ray spectra with recent XMM-Newton observations of the Tycho supernova remnant (SNR). Our goal is to find the most viable thermonuclear SN model that gives good fits to both these X-ray observations and typical SN Ia light curves.
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| 3. |
- Kosenko, D., et al.
(författare)
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Oxygen emission in remnants of thermonuclear supernovae as a probe for their progenitor system
- 2015
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 449:2, s. 1441-1448
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Tidskriftsartikel (refereegranskat)abstract
- Recent progress in numerical simulations of thermonuclear supernova explosions brings up a unique opportunity in studying the progenitors of Type Ia supernovae. Coupling state-of-the-art explosion models with detailed hydrodynamical simulations of the supernova remnant evolution and the most up-to-date atomic data for X-ray emission calculations makes it possible to create realistic synthetic X-ray spectra for the supernova remnant phase. Comparing such spectra with high-quality observations of supernova remnants could allow us to constrain the explosion mechanism and the progenitor of the supernova. The present study focuses in particular on the oxygen emission line properties in young supernova remnants, since different explosion scenarios predict a different amount and distribution of this element. Analysis of the soft X-ray spectra from supernova remnants in the Large Magellanic Cloud and confrontation with remnant models for different explosion scenarios suggest that SNR 0509-67.5 could originate from a delayed detonation explosion and SNR 0519-69.0 from an oxygen-rich merger.
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| 4. |
- Sorokina, E. I., et al.
(författare)
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Dynamics and Radiation of Young Type-Ia Supernova Remnants : Important Physical Processes
- 2004
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Ingår i: Astronomy letters. - : Pleiades Publishing Ltd. - 1063-7737 .- 1562-6873. ; 30, s. 737-750
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Tidskriftsartikel (refereegranskat)abstract
- We analyze the physical processes that should be taken into account when modeling young type-Ia supernova remnants (SNRs) with ages of several hundred years in which forward (into the interstellar medium) and reverse (into the ejection) shocks propagate. We show that the energy losses in a heavy-element-rich ejection can be significant for SNRs even at this evolutionary phase. We study the effects of electron thermal conduction and the rate of energy exchange between electrons and ions on the temperature distribution and the X-ray emission from such SNRs.
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