Magnetic field variations in a single large star V471 Tauri, as explained by SPHERE scientists, refutes old theories that propose the existence of a tiny second companion star in a binary star system. Binary star systems are theoretical, and used in wrong types of supernova gravity models, to measure distances and dark energy expansion rates of galaxies.
No smaller orbiting companion star was detected by the SPHERE team, so there is not a "second star" that they keep mumbling about that they can't find. The best new SPHERE telescope has proven that an irrefutably accepted binary star system in the big-bang stellar classification system is wrong. All standard theories about binary star systems being common in the universe are wrong. Dark energy expansion rates measured by binary supernovas are altogether phony, being likely there is only one large star exploding.