Young and Massive Binary Progenitors of Type Ia Supernovae and Their Circumstellar Matter

摘要: We present new evolutionary models for Type Ia supernova (SN Ia) progenitors, introducing the mass-stripping effect on a main-sequence (MS) or slightly evolved companion star by winds from mass-accreting white dwarf (WD). The mass stripping attenuates rate of transfer to WD. As result, very massive MS can avoid forming common envelope and thus increase WD up until SN explosion. Including effect, we follow binary evolutions various + systems obtain parameter region in initial donor mass-orbital period plane which SNe occur. newly obtained extends masses 6-7 M☉, although its extension depends efficiency effect. stripped matter would mainly be distributed orbital form circumstellar (CSM) around progenitor. This explain CSM Ia/IIn(IIa) supernovae 2002ic 2005gj, as well tenuous normal 2006X. Our model suggests presence young (108 yr) populations Ia, is consistent with recent observational indications young-population Ia.