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There is a long-standing debate regarding the origin of the terrestrialplanets' water as well as the hydrated C-type asteroids. Here we show that theinner Solar System's water is a simple byproduct of the giant planets'formation. Giant planet cores accrete gas slowly until the conditions are metfor a rapid phase of runaway growth. As a gas giant's mass rapidly increases,the orbits of nearby planetesimals are destabilized and gravitationallyscattered in all directions. Under the action of aerodynamic gas drag, afraction of scattered planetesimals are deposited onto stable orbits interiorto Jupiter's. This process is effective in populating the outer main belt withC-type asteroids that originated from a broad (5-20 AU-wide) region of thedisk. As the disk starts to dissipate, scattered planetesimals reachsufficiently eccentric orbits to cross the terrestrial planet region anddeliver water to the growing Earth. This mechanism does not depend strongly onthe giant planets' orbital migration history and is generic: whenever a giantplanet forms it invariably pollutes its inner planetary system with water-richbodies.

Origin of water in the inner Solar System: Planetesimals scattered inward during Jupiter and Saturn's rapid gas accretion