Companion Stars of Type Ia supernovae with different metallicities

Abstract

Meng, Chen & Han (2009) comprehensively and systemically studied the WD + MS system by detailed binary evolution calculations. Following their studies, we have carried out a series of binary population synthesis studies about the properties of the companions of SNe Ia for different metallicities $Z$. We present the distributions of the masses, $M_2^{\mathrm{SN}}$, the radii, $R_2^{\mathrm{SN}}$, of companions, and the periods, $P_{\mathrm{SN}}$, and the ratios of separations to radii, $A/R_2^{\mathrm{SN}}$, of WD + MS systems for various $Z$ at the moment of supernova explosion. These arameters can be applied to constrain the numerical simulation of the interaction between the ejecta of a supernova and its companion. We also show the distributions of some integral properties of companions, i.e. the mass, the space velocity and the surface gravity, for various $Z$ after the interaction. The distributions may help to search companion in a supernova remnant. All the parameters above significantly change with $Z$. Incorporating the simulation results of interaction between supernovae ejecta and companions in Marietta et al. (2000) and Kasen et al. (2004) into our binary population synthesis study, we found that more than 75% of all supernovae have enough polarization signal which can be detected by spectropolarimetric observations. We also found that 13 to 14 per cent SNe Ia belong to the supernovae like 1991T, which is consistent with observations within errors. This may indicate that SNe 1991T-like have not any special properties in physics except for the viewing angle of an observer.

14 pages, 14 figures, accepted for publication in MNRAS

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• Helium star evolutionary channel to super-Chandrasekhar mass type Ia supernovae
• Companion stars of Type Ia supernovae and single low-mass white dwarfs
• A likely candidate of type Ia supernova progenitors: the X-ray pulsating companion of the hot subdwarf HD 49798
• The birth rate of subluminous and overluminous type Ia supernovae
• The X-ray/radio and UV luminosity expected from symbiotic systems as the progenitor of SNe Ia
• The envelope mass of red giant donors in Type Ia supernova progenitors
• Binary population synthesis study on supersoft X-ray phase of single degenerate type Ia supernova progenitors
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