  Hot Jupiters were the first exoplanets to be discovered around main sequence
stars and astonished us with their close-in orbits. They are a prime example of
how exoplanets have challenged our textbook, solar-system inspired story of how
planetary systems form and evolve. More than twenty years after the discovery
of the first hot Jupiter, there is no consensus on their predominant origin
channel. Three classes of hot Jupiter creation hypotheses have been proposed:
in situ formation, disk migration, and high eccentricity tidal migration.
Although no origin channel alone satisfactorily explains all the evidence, two
major origins channels together plausibly account for properties of hot
Jupiters themselves and their connections to other exoplanet populations.
