![]() ![]() Large moons may be produced through asteroid collisions (Canup & Asphaug 2001 Canup 2012). 2013), even though comet collisions and the interaction between the magma and atmosphere have also been suggested as sources of the planet's water (Lunine 2006 Genda & Ikoma 2008). 2000 Raymond, Quinn & Lunine 2007 Izidoro et al. Water must have been delivered to the surface of the Earth, potentially through asteroid impacts (Morbidelli et al. Minor planets, asteroids: general, planets and satellites: dynamical evolution and stability 1 INTRODUCTIONĪsteroidal impacts on terrestrial planets may be important for planet habitability. These results may have implications for the habitability of exoplanetary systems. We also find that changing the semimajor axis of Saturn leads to a significant decrease in the asteroid collision rate, though increasing its mass increases the collision rate. When the super-Earth is placed exterior to Earth's orbit, the collision rate decreases substantially because the ν 6 resonance no longer exists in the asteroid belt region. ![]() This is the result of multiple secular resonance locations causing more asteroids to be perturbed on to Earth-crossing orbits. ![]() For a super-Earth which is interior to the Earth's orbit, the number of asteroids colliding with Earth increases the closer the super-Earth is to the Earth's orbit. We find a significant effect for super-Earths with a mass of around 10 M ⊕ and a separation greater than about 0.7 au. We therefore first consider the effects of the presence of a super-Earth in the terrestrial planet region. ![]() Compared to exoplanetary systems, the Solar system is somewhat special in its lack of a super-Earth mass planet in the inner Solar system. We find that the ν 6 secular resonance plays an important role in the asteroid collision rate with the Earth. With N-body simulations of a planetary system with an asteroid belt, we investigate how the asteroid impact rate on the Earth is affected by the architecture of the planetary system. ![]()
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