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Revealing the Origin of Desert Dwellers via Stellar Obliquities

  • Authors: Tim Hallatt, James E. Owen, Sarah Millholland

Tim Hallatt et al 2026 The Astrophysical Journal Letters 1005 .

  • Provider: AAS Journals

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.

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