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Precession-Driven Dissipation in Exoplanet-Hosting Binary Star Systems

Presentation #401.01 in the session Exoplanet Dynamics 2: Stellar and Planetary Obliquities.

Published onJul 01, 2023
Precession-Driven Dissipation in Exoplanet-Hosting Binary Star Systems

The orbital architectures of planets residing in stellar binary systems trace the dynamical evolution of their host systems, including imprints from the protoplanetary disk phase. For systems with initial misalignment between the binary orbit and circumprimary disk, the gravitational potential of the binary companion drives nodal precession of the disk, in the process forcing precession of the stellar spin axis in well-coupled systems. In this work, we integrate the dynamical evolution of such systems spanning a range of initial configurations and realistic disk parameters, thus synthesizing a joint distribution of stellar obliquities and binary orientations. Hereby, we consider the effect of disk warps self-inducing high dissipation rates via parametric instability. Our results provide constraints on the expected occurrence rate of polar configurations as well as point towards an overabundance of fully-aligned systems, which is consistent with recent observational findings.

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