The intermittently-resonant coevolution of migrating planets and their pulsating stars
arxiv(2024)
摘要
Hot Jupiters are expected to form far from their host star and move toward
close-in, circular orbits via a smooth, monotonic decay due to mild and
constant tidal dissipation. Yet, three systems have recently been found
exhibiting planet-induced stellar pulsations suggesting unexpectedly strong
tidal interactions. Here we combine stellar evolution and tide models to show
that dynamical tides raised by eccentric gas giants can give rise to chains of
resonance locks with multiple modes, enriching the dynamics seen in single-mode
resonance locking of circularized systems. These series of resonance locks
yield orders-of-magnitude larger changes in eccentricity and harmonic
pulsations relative to those expected from a single episode of resonance
locking or nonresonant tidal interactions. Resonances become more frequent as a
star evolves off the main sequence providing an alternative explanation to the
origin of some stellar pulsators and yielding the concept of "dormant migrating
giants". Evolution trajectories are characterized by competing episodes of
inward/outward migration and spin-up/-down of the star which are sensitive to
the system parameters, revealing a new challenge in modeling migration paths
and in contextualizing the observed populations of giant exoplanets and stellar
binaries. This sensitivity however offers a new window to constrain the stellar
properties of planetary hosts via tidal asteroseismology.
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