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Overlap of planet formation with accretion outbursts or gravitational instability

Investigate whether planet formation occurs spatially or temporally concurrent with disk accretion outbursts or within regions of active gravitational instability, and determine how such environments modify growth processes.

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Background

Protostellar disks can experience FU Ori-like outbursts and, especially at early times or large radii, can be self-gravitating. The author notes that these environments differ fundamentally and may alter coagulation, accretion, and migration, posing critical questions about timing and location of planet formation relative to such phenomena.

References

Open questions and problems that I would like to see resolved include, in no particular order: Does planet formation overlap spatially or temporally with disk accretion outbursts, or with regions of active gravitational instability? Either of these processes -- conventionally but not necessarily occurring mostly at early times -- lead to a fundamentally different environment for growth.

Planet formation theory: an overview (2412.11064 - Armitage, 15 Dec 2024) in Section “Some open questions”, Item 5