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Importance of disk-driven migration for close-in giants

Ascertain the importance of disk-driven migration in the formation of close-in giant exoplanets by quantifying its role under varying protoplanetary disk conditions relative to alternative migration channels.

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Background

Multiple mechanisms could deliver giant planets to short-period orbits, including disk-driven migration and high-eccentricity tidal migration triggered by companions. The relative contribution of each mechanism remains debated in the literature.

The authors emphasize that disk-driven migration’s efficacy depends sensitively on disk properties and that its overall importance for producing close-in giants is uncertain, highlighting a broader, field-level unresolved question.

References

The details of disk-driven migration are highly sensitive to the disk conditions, and hence it is not clear how important this migration is for the formation of close-in giants \citep[e.g.][]{2014prpl.conf..667B,2021JGRE..12606629F}.

— TOI-6038 A b: A dense sub-Saturn in the transition regime between the Neptunian ridge and savanna (2501.02272 - Baliwal et al., 4 Jan 2025) in Section “Formation and evolution scenarios”