We invite you to please join us for the CCAPP seminar this week at the special time of 2:00! This week's seminar will be in hybrid format, so you can attend over zoom or in-person at PRB4138. Our speaker this week is Chelsea Harris (Michigan State).
Chelsea’s title and abstract are listed below, and Chelsea will be joining Astro Coffeetomorrow as well. If you would like to schedule a meeting with Chelsea, please fill out the schedule at the following link:
Chelsea's schedule:
https://docs.google.com/spreadsheets/d/1HOqChSxB7ZjhP36Pa2UPgvNHM38R1LeZUBiH8aeRgDI/edit?usp=sharing
Link for the CCAPP Seminar on Tuesday:
https://osu.zoom.us/j/96209154804?pwd=d1lWZnRueGVVa2tabUZTak4xSkpaQT09password: CCAPP-2021
"Understanding the Emerging Class of Type Ia Supernovae with Circumstellar Material"Type Ia supernovae (SNe Ia), the complete thermonuclear explosions of a carbon-oxygen white dwarf, are precise cosmological tools used to measure the expansion rate of the universe. Unlike other classes of SNe, however, SNe Ia necessarily has close binary star progenitors, which poses a significant challenge to understanding them - in particular, the nature of the companion star and the mechanism by which explosion is triggered. An enormous body of research over the last several decades has been dedicated to this problem due to its implications for cosmology measurements and binary star evolution theory, such that there are now many viable progenitor models and a wide array of observations made to test them. Circumstellar material (CSM) has long been a key progenitor diagnostic since a leading model involves the main sequence of red giant stars that produce stellar winds. The CSM is revealed by the shock produced by interaction with SN ejecta, which is a panchromatic phenomenon. Interpretation of SN Ia observations has been largely done using the theoretical models for interaction with smooth winds that have been successfully applied to understanding core-collapse supernova interaction. The search for CSM around SNe Ia has gone on for decades, but only in the ~15 years or so have we found the long-sought CSM. Unfortunately, the CSM around SNe Ia is not the smooth wind that we had models for - it's essentially everything and anything else. In this talk, I will discuss the work that I have done on numerical simulations of Ia interaction, collaborations with observers on discovering more cases of interaction, and upcoming work to extend my models into the sphere of panchromatic datasets
