The type of supernova created by the merger of two white dwarfs is called a Type Ia supernova.

Here's why:

* White Dwarf Merger: Type Ia supernovae are triggered when two white dwarfs, the dense remnants of stars like our Sun, spiral closer and eventually merge.

* Carbon Fusion: The combined mass of the merged white dwarf exceeds the Chandrasekhar limit, which is the maximum mass a white dwarf can sustain. This causes runaway carbon fusion in the core, leading to a catastrophic explosion.

* Consistent Brightness: Because Type Ia supernovae are triggered by the same process, they release roughly the same amount of energy and have remarkably consistent peak brightness. This makes them useful as "standard candles" for measuring cosmological distances.

Let me know if you'd like to know more about the details of white dwarf mergers or the use of Type Ia supernovae in cosmology!