Research from a Caltech theoretical astrophysicist presents a new mechanism for how dying Sun-like stars move through space during their transformation into white dwarfs. The model suggests that as stars expand into red giants and shed their outer layers, the escaping material does not depart in a smooth, balanced pattern. Instead, chaotic and asymmetric bursts of matter repeatedly push the star in different directions, producing what the physicist describes as “kicks” that follow Newton’s third law.
According to calculations, a star approaching the white dwarf stage may experience approximately 10,000 small kicks over several hundred thousand years. Each individual kick is modest, moving the star at only a few meters per second. However, these random directional pushes accumulate through a mathematical process similar to a random walk, where despite the chaotic nature of individual events, a net displacement occurs in one direction. The combined effect of thousands of small kicks could result in a final velocity around 1 kilometer per second.
The model addresses an observational puzzle that has long concerned astronomers. Research by a Caltech assistant professor found that widely separated pairs of stars, or binary systems, become less common after one member becomes a white dwarf. The new theoretical framework provides a possible explanation: a cumulative kick of roughly 1 kilometer per second could be sufficient to disrupt the orbital dynamics of loosely bound stellar pairs, causing them to separate and become gravitationally unbound.
The research combines observational data with computer simulations of the convection processes occurring inside aging red giants. The simulations demonstrate that churning material near the stellar surface can escape in an uneven manner rather than flowing away in a uniform distribution. This work represents the first direct connection between multiple randomly directed ejection events and the motion of white dwarfs that astronomers have long suspected. The study was presented at a major astronomy conference in Pasadena and has been submitted to a peer-reviewed publication. The model also makes predictions about potential stellar collisions in binary systems that could produce detectable explosions, offering a method for future testing.
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