摘要
Recent studies have suggested that type lax supernovae(SNe lax) are likely to result from a weak deflagration explosion of a Chandrasekhar-mass white dwarf in a binary system with a helium(He)-star companion.Assuming that most SNe Iax are produced from this scenario,in this work we extend our previous work on the threedimensional hydrodynamical simulation of ejecta-companion interaction by taking the orbital and spin velocities of the progenitor system into account.We then follow the post-impact evolution of a surviving He-star companion by using the one-dimensional stellar evolution code MESA.We aim to investigate the post-explosion rotation properties of a He-star companion in SNe Iax.We find that the He-star companion spins down after the impact due to the angular-momentum loss and expansion caused by the mass-stripping and shock heating during the interaction.This leads to the situation where the surface rotational speed of the surviving companion can drop to one-third of its pre-explosion value when it expands to a maximum radius a few years after the impact.Subsequently,the star shrinks and spins up again once the deposited energy is released.This spin-switching feature of the surviving He-star companions of SNe Iax may be useful for the identification of such objects in future observations.
基金
supported by the National Key R&D Program of China (Nos. 2021YFA1600400, 2021YFA1600401)
the National Natural Science Foundation of China (NSFC, Grant Nos. 11873016, 11973080, and 11733008)
the Chinese Academy of Sciences, and Yunnan Province (Nos. 12090040, 12090043, 202001AW070007, 2019HA012, and 2017HC018)
support from the Yunnan Ten Thousand Talents Plan–Young & Elite Talents Project
the CAS “Light of West China” Program。
