Two-Dimensional Simulations of Circumstellar Material Collisions from Exploding Stars

Ruo-Yu Liu^1,2*, Ke-Jung (Ken) Chen^2,3

¹Department of Physics, National Taiwan University, Taipei, Taiwan
²Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan
³Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Tokyo, Japan

* Presenter:Ruo-Yu Liu, email:b06202053@ntu.edu.tw

I will present 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 that strong radiation may be emitted from such collisions, affecting the SN observables significantly; besides, strong mixing due to shockwaves is observed, and the trace of clumps in SN remnants can also be interpreted.

Keywords: Astrophysical Simulation, Supernova Explosion, Circumstellar Material