Stellar Flybys Leave a Permanent Mark on Newly Forming Planetary Systems - by spacewriter
FU Orionis and its associated nebula. It’s likely the nebula was disrupted by a flyby, and the brightening is one effect of the event. Image cedit: ESO
Flybys aren’t terribly rare, according to Cuello. “I would say that at least half of the stars and their discs are affected/shaped by flybys,” he said. “One important aspect to highlight is that the probability of such perturbations decreases over time but never goes to zero. So, even more-evolved stars can experience a flyby during their lifetime.
During some encounters, the disk goes through what’s called “tidal truncation”. That can remove up to 80 percent of the disk’s mass. This has a catastrophic effect on planet formation because the encounter reduces the amount of material needed to form protoplanets. Such flybys might also create dust traps. Theoretically, those could be places where planetesimals could grow, given enough time.
Artist’s impression of the early Solar System in the making. Stellar flybys may have helped shape the birth cloud of the planets. Credit: NASA/JPL-Caltech
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