Image Details
Caption: Figure 1.
Schematic of a hot Jupiter undergoing “lossy” Roche-lobe overflow. The host star spin angular momentum vector S⋆ is misaligned with the planet’s orbital angular momentum L by obliquity ψ⋆. Outflowing gas passes through a nozzle at the first Lagrange point (dotted ellipse), before coupling to the stellar magnetic field (in red) at the Alfvén radius; accreting gas is funneled along field lines onto the magnetic poles (assumed coincident with the rotation axis), preventing the formation of a disk. Angular momentum transfer during Roche-lobe overflow shepherds S⋆ into alignment with L; obliquity is damped.
© 2026. The Author(s). Published by the American Astronomical Society.