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Although type Ia supernovae (SNe Ia) are so important in many astrophysicalfields, a debate on their progenitor model is still endless. Searching thesurviving companion in a supernova remnant (SNR) may distinguish differentprogenitor models, since a companion still exists in the remnant for thesingle-degenerate (SD) model, but does not for the double degenerate (DD)model. However, some recent surveys do not discover the surviving companions inthe remnant of SN 1006 and Kepler's supernova, which seems to disfavor the SDmodel. Such a result could be derived from an incorrect survey target. Here,based on the common-envelope wind SD model for SNe Ia, in which the initialbinary system consists of a white dwarf (WD) and a main-sequence (MS) star, wefound that the companion at the moment of supernova explosion may be a MS,red-giant (RG) or subdwarf B (sdB) star if a spin-down timescale of less than$10^{\rm 7}$ yr is assumed. We show the properties of the companions at themoment of supernova explosion, which are key clues to search the survivingcompanions in SNRs. Here, we suggest that the sdB star may be the survivingcompanion in some SNRs, even if the progenitor systems are the WD + MS systems.The SNe Ia with the sdB companions may contribute to all SNe Ia as much as22\%.

Subdwarf B stars as possible surviving companions in Type Ia supernova remnants