Chandrasekhar-mass white dwarfs are the progenitors of a small fraction of Type Ia supernovae according to nucleosythesis constraints - Archive ouverte HAL Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society: Letters Year : 2022

## Chandrasekhar-mass white dwarfs are the progenitors of a small fraction of Type Ia supernovae according to nucleosythesis constraints

Eduardo Bravo
• Function : Author
Inma Domínguez
• Function : Author

#### Abstract

The precise progenitor system of type Ia supernovae (SNe Ia), whether it is a white dwarf (WD) close to the Chandrasekhar limit or substantially less massive, has been a matter of debate for decades. Recent research by our group on the accretion and simmering phases preceding the explosion of a massive WD has shown that the central density at thermal runaway lies in the range $(3.6-6.3)\times10^9$ g cm$^{-3}$ for reasonable choices of accretion rate onto the WD and progenitor metallicity. In this work, we have computed one-dimensional simulations of the explosion of such WDs, with special emphasis on the chemical composition of the ejecta, which in all cases is extremely rich in neutronized isotopes of chromium ($^{54}$Cr) and titanium ($^{50}$Ti). We show that, in order to reconcile such a nucleosynthesis with the isotopic abundances of the Solar System, Chandrasekhar-mass white dwarfs can account for at most 26 per cent of normal-luminosity SNe Ia, or at most 20 per cent of all SNe Ia.

### Dates and versions

hal-03774947 , version 1 (12-09-2022)

### Identifiers

• HAL Id : hal-03774947 , version 1
• ARXIV :
• DOI :

### Cite

Eduardo Bravo, Luciano Piersanti, Stéphane Blondin, Inma Domínguez, Oscar Straniero, et al.. Chandrasekhar-mass white dwarfs are the progenitors of a small fraction of Type Ia supernovae according to nucleosythesis constraints. Monthly Notices of the Royal Astronomical Society: Letters, 2022, 517 (1), pp.L31-L35. ⟨10.1093/mnrasl/slac103⟩. ⟨hal-03774947⟩

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