Compound chondrule formation via collision of supercooled droplets

• Most of the compound chondrules are nonporphyritic in ordinary chondrites.
• Primaries of compound chondrules are larger than secondaries.
• Most of the compound chondrules are formed from completely molten droplets.
• Completely molten levitated droplets invariably turn into supercooled droplets.
• The supercooled-collision model can reproduce the observed features.

We present a novel model showing that compound chondrules are formed by collisions of supercooled droplets. This model reproduces two prominent observed features of compound chondrules: the nonporphyritic texture and the size ratio between two components.