Astronomy & Astrophysics Seminar: Can the Helium-detonation Model Explain the Observed Diversity of Type Ia Supernovae?

Zoom: https://us02web.zoom.us/j/84211520648?pwd=dllEbUhBU1VRUDZPL2lWRnhjWEdzZz09

Abstract:

The explosion mechanism of Type Ia supernovae (SNe Ia), a thermonuclear stellar explosion in electron-degenerate matter, is a long-standing problem. The energy of the explosion can be propagated by subsonic (deflagration) or supersonic (detonation) waves, or a combination of the two. We study a sample of 16 SNe Ia having observations within 2–3 days after first light. We propose that, with a geometric/projected effect, the He-detonation model may account for the similarity in birthplace environment and the differences seen in some SNe Ia, including B − V colors, C II features, Ca II near-IR triplet high-velocity features at early times, and the velocity distribution of [Fe II] lines in the nebular phase. Nevertheless, some features predicted by He-detonation simulations, such 

Seminar Organizer: Dr. Iair Arcavi