Abstract

Contributed Talk - Splinter SNR

Thursday, 12 September 2024, 14:00   (S14)

Semi-confined supernovae within HII regions and their effect on the ISM

Cheryl S. C. Lau [1], Ian A. Bonnell [1]
[1] University of St Andrews, UK

Galactic-scale simulations often rely on feedback sub-grid models to provide prescriptions for the coupling efficiency between SNe and the ISM. Most of the current SN models are 1-D to allow for easier ways to account for the complexity of the local environment around SN progenitors, such as different density or turbulent structures. However, results from small-scale simulations revealed that the release of energy from SNe are typically non-spherically symmetrical. Pre-SN feedback, such as photoionization, carves cavities and low-density channels in the molecular cloud within which the SN detonates. Being partially confined by the cavity, the SN energy escapes preferentially through the channels into the outer environment, departing from the behaviour described by the standard 1-D models. This mode of energy release alters the evolution of SN shocks as well as the kinematic properties within the SNR as plumes develop from the outflows. In this talk, I will present our results on studying SN explosions within HII region bubbles. I will illustrate why it is necessary to take this semi-confinement effect into account when modelling SNR.