Please join us on Tuesday at for the CCAPP seminars of Trevor Dorn-Wallenstein (https://tzdwi.github.io) and Kartick Sarkar (http://old.phys.huji.ac.il/~sarkar.kartick/).
Both of these talks will be virtual, on Tuesday Nov 30 at 11:30 Eastern Time on the zoom link below.
The titles and abstracts of the seminars are below, together with the zoom link and password.
To schedule a meeting, please use the following Google Docs:
Trevor (host Jennifer Johnson):https://docs.google.com/spreadsheets/d/1jKhTEUwUgA-PdTVbyjoZT6wJzg8RWf2243QDik9UNbU/edit?usp=sharing
Kartick (host Smita Mathur):https://docs.google.com/spreadsheets/d/1RGQSXwAZvLiJhtAbk7Zz8gn-PDUi8l5fP-fEnsZ5V8A/edit?usp=sharing
Link for the CCAPP Seminar on Tuesday:https://osu.zoom.us/j/96209154804?pwd=d1lWZnRueGVVa2tabUZTak4xSkpaQT09
password: CCAPP-2021
Speaker: Trevor Dorn-Wallenstein
Title: Constraining Core Collapse Scenarios in Massive Stars
Abstract: Massive stars play a critical role in the evolution of their host galaxies, and are phenomenal astrophysical laboratories in which to constrain stellar evolution. Between their beginnings as O and B stars and their afterlives as compact objects, massive stars undergo core collapse, resulting (most of the time) in spectacular supernova explosions. However, the factors that determine whether a massive star explodes, the nature of the supernova, and the compact object that gets left behind are poorly constrained. In this talk, I will introduce a newly-discovered class of objects: fast yellow pulsating supergiants (FYPS). As candidate post-red supergiant objects, FYPS can be used to uniquely identify which stars lose their envelopes before core collapse, and which don't. Simultaneously, pulsation frequencies extracted from the TESS light curves of FYPS have the potential to probe the extent of the convective cores of helium burning massive stars for the first time. I will walk through how FYPS were discovered, discuss some of their fascinating properties, and conclude with a look forward at how FYPS can solve our fundamental questions about how massive stars end their lives.
Speaker: Kartick Sarkar
Title: Non-equilibrium ionization and radiation transport in galactic bubbles and winds
Abstract: Supernovae-driven bubbles and winds form a major part of the feedback mechanism that controls the flow of baryonic matter in galaxies. Observational estimates of the momentum deposition by SN, and mass and energy outflow in winds depend on theoretical modeling of the dynamics and emission/absorption properties of such systems. In the talk, I will describe our recent efforts to model some of these systems by considering a self-consistent non-equilibrium ionization network and frequency-dependent radiative transport physics. I will show how the addition of the new physics changes our basic understanding of these systems and what it implies for the observation
