Which of the following is the double-degenerate model for Type Ia supernovae [soo-per-NOH-vee]?
W) The cores of a binary system undergo common envelope evolution collapse and explode after iron fusion
X) A red giant overflows its Roche [ROHSH] lobe and dumps matter onto a white dwarf until the white dwarf exceeds the Chandrasekhar [chun-druh-SAY-ker] mass
Y) Two white dwarfs collide to create a new object, which exceeds the Chandrasekhar mass
Z) A main sequence star overflows its Roche lobe and dumps matter onto a white dwarf until the white dwarf exceeds the Chandrasekhar mass
✔️Answer:Y) TWO WHITE DWARFS COLLIDE TO CREATE A NEW OBJECT, WHICH EXCEEDS THE CHANDRASEKHAR MASS
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