Two exploding white dwarfs produce ejecta separation velocities of at most 5440 km/s and little mass in the inner ejecta, making it hard for this channel to explain bimodal type Ia supernova line profiles with separations near 7000 km/s.
D., Malanchev K., Sharief S., Jones D
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Difficulties of two exploding white dwarfs to account for type Ia supernovae with bimodal nebular emission profiles
Two exploding white dwarfs produce ejecta separation velocities of at most 5440 km/s and little mass in the inner ejecta, making it hard for this channel to explain bimodal type Ia supernova line profiles with separations near 7000 km/s.