Colloquium on 1 December 2016
Observational Tests of SN Ia Explosion Models with a Complete Sample

Details

Title: Observational Tests of SN Ia Explosion Models with a Complete Sample
Speaker: Prof. Subo Dong (Kavli Institute for Astronomy, Peking University)
Date: Thursday, 1 December 2016
Time: 11:00 - 12:00
Venue: 1896 Building

Abstract

The explosion mechanism of type Ia supernovae is unknown. We argue that the direct white dwarf-white dwarf collisions in the field multiple stellar systems is the most promising mechanism to explain the SN Ia population. Not only do collisions explain several robust features across the entire SN Ia population, but also their predictions of the bi-modal Ni56 distributions in the ejecta are recently discovered observationally. I will discuss key observational tests on the collision models enabled by the All Sky Automatic Survey for SuperNovae (ASAS-SN) — the most successful bright supernova survey at present. With the unbiased supernova searches of ASAS-SN, we have also discovered ASASSN-15lh — a type I super-luminous supernova that is the most luminous supernova ever recorded.
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