Spectral modelling of supernovae.
This is a continuation of proposal 2017/1-228 - Spectral modelling of supernovae. The first two months of proposal 2017/1-228 were mainly spent on tests of the code. However, during the last month we have been running on full speed, and we have finished about half of the models for the paper presenting the JEKYLL code. We have also decided to add a comparison of JEKYLL to the similar code ARTIS (Kromer et al. 2009). This comparison will be done in collaboration with Markus Kromer (ZAH) and requires additional models to be run. The models finished so far looks good and we are confident that we will be able to submit the paper to the Astrophysical Journal later this year. Here follows a summary of the project as described in proposal 2017/1-228 (see the original proposal for further details): Supernovae (SNe) play an important role in astrophysics and are responsible for injection of synthesized (heavy) elements and energy into the interstellar medium, and for the formation of neutron stars and black holes. This project aims to model the spectral evolution of SNe in order to understand the stars that give rise to them and the physics of the core-collapse and the explosion that follows. The modelling is done using JEKYLL, a new state-of-the-art code developed by us for this purpose. The code solves for the state of the expanding gas and the radiation field using a Monte-Carlo based technique outlined in a series of papers by Leon Lucy (2002, 2003, 2005). The result of the project will be a paper describing and testing the code, as well as applying it to modelling of Type IIb SNe. This type of SNe are thought to originate from stars that have lost most but not all of their hydrogen envelope, possibly by mass transfer in binary systems.