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On Type Ia supernovae from the collisions of two white dwarfs

Authors

Raskin, Cody;
Timmes, F. X.;
Scannapieco, Evan;
Diehl, Steven;
Fryer, Chris
RefereedArticle

Abstract

We explore collisions between two white dwarfs as a pathway for making Type Ia supernovae (SNIa). White dwarf number densities in globular clusters allow 10-100, redshift <~1 collisions per year, and observations by Chomiuk et al. of globular clusters in the nearby S0 galaxy NGC 7457 have detected what is likely to be a SNIa remnant. We carry out simulations of the collision between two 0.6Msolar white dwarfs at various impact parameters and mass resolutions. For impact parameters less than half the radius of the white dwarf, we find such collisions produce ~0.4Msolar of56Ni, making such events potential candidates for underluminous SNIa or a new class of transients between Novae and SNIa.

Details

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*The material contained in this document is based upon work supported by a National Aeronautics and Space Administration (NASA) grant or cooperative agreement. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of NASA.

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