Stellar activity can mimic misaligned exoplanets

PhysOrg

The occultation of stellar active regions during the planetary transit can lead to inaccurate estimates of the characteristics of these exoplanets, especially the spin-orbit tilt angle. This was the conclusion of simulations made by a team of astronomers from the Instituto de Astrofísica e Ciências do Espaço (IA) in Portugal, and Institute of Astrophysics of Georg-August University of Göttingen, in Germany.

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