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BY-NC-ND 4.0 license Open Access Published by De Gruyter Open Access December 14, 2017

The WD+He star binaries as the progenitors of type Ia supernovae

  • Bo Wang EMAIL logo and Dongdong Liu
From the journal Open Astronomy


Employing the MESA stellar evolution code, we computed He accretion onto carbon-oxygen white dwarfs (CO WDs).We found two possible outcomes for models in which the WD steadily grows in mass towards the Chandrasekhar limit. For relatively low He-accretion rates carbon ignition occurs in the center, leading to a type Ia supernova (SN Ia) explosion, whereas for relatively high accretion rates carbon is ignited off-center, probably leading to collapse. Thus the parameter space producing SNe Ia is reduced compared to what was assumed in earlier papers, in which the possibility of off-center ignition was ignored. We then applied these results in binary population synthesis modelling, finding a modest reduction in the expected birthrate of SNe Ia resulting from the WD+He star channel.


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Received: 2017-9-4
Accepted: 2017-10-23
Published Online: 2017-12-14
Published in Print: 2017-12-20

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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