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Hot Jupiters are Mildly Isolated

Presentation #403.03 in the session Exoplanets Formation & Evolution (Oral Presentation)

Published onOct 23, 2023
Hot Jupiters are Mildly Isolated

The first discovered extrasolar worlds — giant, “hot Jupiter” planets orbiting perilously close to their parent stars — came as a surprise to solar-system-centric models of planet formation. This prompted the development of new theories to produce these unexpected planets. The dearth of observed nearby companions to hot Jupiters has previously supported the mechanism of high-eccentricity tidal migration, in which hot Jupiters form further out in their natal protoplanetary disks before being thrown inward via violent high-eccentricity tidal migration, stripping systems of any close-in planetary companions. By contrast, we demonstrate through a careful analysis of the full four-year Kepler dataset that at least 12% of hot Jupiters have additional nearby planetary companions. As a result, these hot Jupiters must have a quiescent formation history such that they were able to retain nearby companions. We conclude with a new paradigm for hot Jupiter formation that is consistent with all current lines of evidence.

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