scholarly journals Type Ia Supernovae and Supersoft X-ray Sources

2011 ◽  
Vol 7 (S281) ◽  
pp. 244-247 ◽  
Author(s):  
L. R. Yungelson
Keyword(s):  
Elliptical Galaxies ◽  
Lower Number ◽  
Type Ia Supernovae ◽  
X Ray ◽  
Average Mass ◽  
Different Types ◽  
Type Ia ◽  
Nuclear Burning ◽  
The Difference ◽  
Ia Supernovae

AbstractThe rates of SNe Ia for double-degenerate and single-degenerate scenarios are computed for the models of spiral and elliptical galaxies. The number of nuclear burning white dwarfs (NBWDs) is traced. The data favors the double-degenerate scenario and suggests a lower number of NBWDs per unit mass in ellipticals. Their lower average mass is one of the reasons for the difference in the number of supersoft X-ray sources observed in the galaxies of different types.

scholarly journals Excluding supersoft X-ray sources as progenitors for four Type Ia supernovae in the Large Magellanic Cloud

2019 ◽  
Vol 484 (1) ◽  
pp. 1317-1324 ◽  
Author(s):  
J Kuuttila ◽  
M Gilfanov ◽  
I R Seitenzahl ◽  
T E Woods ◽  
F P A Vogt
Keyword(s):  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Type Ia Supernovae ◽  
X Ray ◽  
Type Ia ◽  
Ia Supernovae

scholarly journals Binary Paths to Type Ia Supernovae Explosions: the Highlights

2011 ◽  
Vol 7 (S281) ◽  
pp. 341-350
Author(s):  
Lilia Ferrario
Keyword(s):  
Binary System ◽  
Main Channel ◽  
Host Galaxy ◽  
Type Ia Supernovae ◽  
Definitive Answer ◽  
Type Ia ◽  
Nuclear Burning ◽  
External Galaxies ◽  
Pass Through ◽  
Ia Supernovae

AbstractThis symposium was focused on the hunt for the progenitors of Type Ia supernovae (SNe Ia). Is there a main channel for the production of SNe Ia? If so, are these elusive progenitors single degenerate or double degenerate systems? Although most participants seemed to favor the single degenerate channel, there was no general agreement on the type of binary system at play. An observational puzzle that was highlighted was the apparent paucity of supersoft sources in our Galaxy and also in external galaxies. The single degenerate channel (and as it was pointed out, quite possibly also the double degenerate channel) requires the binary system to pass through a phase of steady nuclear burning. However, the observed number of supersoft sources falls short by a factor of up to 100 in explaining the estimated birth rates of SNe Ia. Thus, are these supersoft sources somehow hidden away and radiating at different wavelengths, or are we missing some important pieces of this puzzle that may lead to the elimination of a certain class of progenitor? Another unanswered question concerns the dependence of SNe Ia luminosities on the age of their host galaxy. Several hypotheses were put forward, but none was singled out as the most likely explanation.It is fair to say that at the end of the symposium the definitive answer to the vexed progenitor question remained well and truly wide open.

scholarly journals On the Progenitors of Type Ia Supernovae

2002 ◽  
Vol 187 ◽  
pp. 103-108
Author(s):  
X.-D. Li ◽  
E. P. J. van den Heuvel
Keyword(s):  
Nuclear Fuel ◽  
White Dwarfs ◽  
Radiation Temperature ◽  
Type Ia Supernovae ◽  
Characteristic Radiation ◽  
X Ray ◽  
Bolometric Luminosity ◽  
Type Ia ◽  
Ia Supernovae ◽  
Eddington Limit

Supersoft X-ray sources (hereafter SSS) are a class of luminous (bolometric luminosity ~ 1037 − 1038 erg s−1) objects with a characteristic radiation temperature of 30 to 60 eV (Hasinger 1994; Kahabka & Trümper 1996). The most popular model for SSS is that they are massive white dwarfs steadily burning nuclear fuel accreted from a more massive binary companion at a rate near or above the Eddington limit (van den Heuvel et al. 1992).

scholarly journals Progenitors of type Ia supernovae in elliptical galaxies

2011 ◽  
Author(s):  
M. Gilfanov ◽  
Á. Bogdán ◽  
Ersin Göğüş ◽  
Ünal Ertan ◽  
Tomaso Belloni
Keyword(s):  
Elliptical Galaxies ◽  
Type Ia Supernovae ◽  
Type Ia ◽  
Ia Supernovae

scholarly journals CONSTRAINTS ON THE COSMOLOGICAL DENSITY PARAMETERS AND COSMIC TOPOLOGY

2007 ◽  
Vol 16 (02n03) ◽  
pp. 207-217 ◽  
Author(s):  
M. J. REBOUÇAS
Keyword(s):  
Mass Fraction ◽  
Type Ia Supernovae ◽  
Data Sets ◽  
X Ray ◽  
Set Constraints ◽  
Type Ia ◽  
Ia Supernovae ◽  
The Universe ◽  
Nontrivial Topology ◽  
Spatial Section

A nontrivial topology of the spatial section of the universe is an observable which can be probed for all homogeneous and isotropic universes, without any assumption on the cosmological density parameters. We discuss how one can use this observable to set constraints on the density parameters of the universe by using a specific spatial topology along with type Ia supernovae and X-ray gas mass fraction data sets.

scholarly journals Theory of Nova Outbursts and Type Ia Supernovae

2015 ◽  
Vol 2 (1) ◽  
pp. 205-211
Author(s):  
M. Kato ◽  
I. Hachisu
Keyword(s):  
Near Infrared ◽  
Light Curves ◽  
Infrared Light ◽  
Type Ia Supernovae ◽  
Theoretical Understanding ◽  
X Ray ◽  
Classical Novae ◽  
Type Ia ◽  
Ia Supernovae ◽  
Nova Outbursts

We briefly review the current theoretical understanding of the light curves of novae. These curves exhibit a homologous nature, dubbed the universal decline law, and when time-normalized, they almost follow a single curve independently of the white dwarf (WD) mass or chemical composition of the envelope. The optical and near-infrared light curves of novae are reproduced mainly by free-free emission from their optically thick winds. We can estimate the WD mass from multiwavelength observations because the optical, UV, and soft X-ray light curves evolve differently and we can easily resolve the degeneracy of the optical light curves. Recurrent novae and classical novae are a testbed of type Ia supernova scenarios. In the orbital period versus secondary mass diagram, recurrent novae are located in different regions from classical novae and the positions of recurrent novae are consistent with the single degenerate scenario.

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