The Kepler field's most explosively active star is a red giant whose record superflares come from leftover differential rotation (https://phys.org/news/2026-10-astronomers-uncover-powerful-stellar-flares.html) driving a powerful magnetic dynamo inside it. Its dwarf companion only supplies the tides that nearly synchronized the giant's spin, so the flares belong to the giant's own starspots rather than to magnetic links between the two stars.
Source: https://phys.org/news/2026-10-astronomers-uncover-powerful-stellar-flares.html
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