Oral Presentation

Two-Dimensional Simulations of Circumstellar Material Collisions from Exploding Stars

Author(s): Ruo-Yu Liu(NTU), Ke-Jung (Ken) Chen (ASIAA)

Presenter: Ruo-Yu Liu (National Taiwan University)

We present the 2D simulations of circumstellar material (CSM) interactions with supernovae (SNe) by using CASTRO code. During the evolution of a massive star, a vast amount of mass is ejected by stellar winds and leads to form an inhomogeneous CSM, which consists of numerous dense clumps, around the parent star. When the star eventually explodes as an SN, its shockwaves and ejecta start violently interacting with these clumps. We simulate the collisions to identify the fluid instabilities and its resulting mixing. Our results suggest strong radiation may be emitted from such collisions and it affects the SN observables significantly. Besides, the mass-loss history of a massive star can be reconstructed based on our models.