Signatures of Bimodality in Nebular Phase Type Ia

Supernova Spectra: Indications of White Dwarf Collision

Progenitors

Almog Yalinewich

Randoastro Group Meeting

28.2.19

Artist's concept of SN1006

Light Echos

What else are SNe important for?

Feedback in galaxy formation

Nucleosynthesis

Rung in the Cosmic distance ladder

Cosmic Rays

Different kinds of supernovae

Supernova rates

\frac{r_{II}}{r_{Ia}} \approx \frac{r_{Ia}}{r_{Ib/c}} \approx 2
r_{II} \approx 10^{-2} \rm year^{-1}

per galaxy

Relics

Non detected for type Ia

Companions

Observations favour a degenerate companion

\rho \propto \frac{\dot{M}}{v_w}

Double Degenerate Models

Roche Lobe Overflow

Merger

Collision

Lidov Kozai Mechanism

\cos i \sqrt{1-e^2} = \rm const

conservation of one component of the angular momentum

Collision induced Detonation

Zeldovich Criterion

\frac{u}{\dot{u}} > \frac{L}{c_s}

Converging velocity field

Double Ni56 Peak

Enter LBT

Observations

Spectra

Final Tally

Consistent with previous estimates

A class of partly burnt runaway stellar remnants from peculiar thermonuclear supernovae

The curious case of LP 40-365

Two More hypervelocity white dwarf in GAIA DR2

Not just fast - also hot

Outside evolutionary track

Strange Composition

Survivor of type Iax supernova?

Mertis

but...

velocity

heat

Models don't reproduce composition

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