| Habitability of exoplanets in binary star systems |
|
In our Galaxy, most of the stars have at least one stellar companion. When hosting a gas giant planet, the dynamics in binary star systems during the early and late phase of planetary formation can lead to various planetary architectures especially in the habitable zone. Because water is the main ingredient defining the habitability of a planet, it is important in binary star systems to understand the water transport mechanism by icy asteroids.
|
| Near-Earth Asteroids |
|
Near-Earth asteroids are objects regurlarly crossing the Earth's orbit and can very often come very close to it. Some of them, called Potentially Hazardous Asteroids, would become a threat if they come close to 0.05 au. Dedicated surveys focused on objects with diameter under one kilometer as only ~ 20% of them are presently known. Observations, orbital accuracy and a full dynamical model are key parameters to give reliable impact probabilities for future mitigation studies (e.g. NEOShield). Indeed, a single 100 meter object would become a big destroyer if he had to impact with the Earth.
|