CAA Seminar (1/9,2017): Direct collision of white dwarfs as a major channel for type Ia supernova explosions
公告来源:学术活动 发布日期:2017/02/15

Time: 14:00-15:00,9th January.

Address: CAA lecture Hall,Jianchuan Road 955(我享我家大厦2楼)


Title:Direct collision of white dwarfs as a major channel for type Ia supernova explosions

Speaker:Prof. Subo Dong (KIAA, PKU)

Abstract:

The explosion mechanism of type Ia supernovae (SN Ia) 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 SNe Ia. The collision model explains several robust observational features across the entire SN Ia population. It also predicts the bi-modal Ni56 distributions in the ejecta, and we have discovered from the nebular-phase spectra of SNe Ia that such bi-modality is common, providing direct support of the collision model. I will discuss key observational tests on the collision model enabled by the All Sky Automatic Survey for SuperNovae (ASAS-SN) — the most successful bright supernova survey at present.