Chandrasekhar-mass white dwarfs are the progenitors of a small fraction of Type Ia supernovae according to nucleosythesis constraints Bravo, Eduardo Domínguez Aguilera, María Inmaculada Hydrodynamics Nuclear reactions, nucleosynthesis, abundances Supernova: general White dwarfs Galaxies: abundances 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 ×10 9 g cm −3 for reasonable choices of accretion rate on to 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 WDs can account for at most 26 per cent of normal-luminosity SNe Ia, or at most 20 per cent of all SNe Ia. 2023-03-13T09:17:25Z 2023-03-13T09:17:25Z 2022-09-08 journal article Eduardo Bravo... [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, Volume 517, Issue 1, November 2022, Pages L31–L35, [https://doi.org/10.1093/mnrasl/slac103] https://hdl.handle.net/10481/80552 10.1093/mnrasl/slac103 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Oxford University Press