Evolution Toward the Observational Features of a Stripped Envelope Type Ⅱb Supernova in a Binary System

作者：Gang Long; Han-Feng Song; Rui-Yu Zhang; Ying Qin; Liu-Yan Zhao; Shi-Tao Qi; Fang-Wen Wu

来源：Research in Astronomy and Astrophysics, 2022, 22(05): 148-159.

Type Ⅱb supernovae(SNe Ⅱb) that have a thin layer of hydrogen left in their outer envelope have been believed to belong to core collapse supernovae.Mass transfer via Roche lobe overflow can significantly change the nucleosynthesis and surface chemical elements of the progenitors of SNe Ⅱb.We aim to explore what conditions a close binary can meet with the observational features of SNe Ⅱb.We find that an observed low mass SN Ⅱb cannot be produced by a low mass isolated star with M <20,M⊙ due to the existence of a thick hydrogen envelope regardless of rotation.Binaries dominate as progenitors in the mass interval(i.e.,M <20 M⊙) considered in this paper.The 16 M⊙,primary with a 14 M⊙companion in a binary system with～10 days <Porb <720 days can reproduce observational features of SNe Ⅱb(i.e.,Teff,log L/L⊙,MHe,MH,etc.).With the decrease of the hydrogen-rich envelope mass,the radius of the progenitor shrinks.The associated types of SN Ⅱb progenitors from RSGs and YSGs to BSGs are closely related to the amount of hydrogen left in the envelopes.Rotation can bring the production of the CNO reaction to the stellar surface at an early phase,which would explain the nitrogen-rich circumstellar material of SN 1993 J and can also explain the large He/H ratio of supernova ejecta.Rotation can increase the corresponding region of the orbital period which can produce an SN Ⅱb.

• 出版日期2022