The Relationship Between Passing Stars and the Solar System's Dynamical Evolution Dr. Nathan Kaib скачать в хорошем качестве

The Relationship Between Passing Stars and the Solar System's Dynamical Evolution Dr. Nathan Kaib

Title: The Relationship Between Passing Stars and the Solar System's Dynamical Evolution Abstract: Long-term computer simulations of our planets' orbital evolution have revealed that this evolution is chaotic and that the inner planets' orbital eccentricities diffuse over time. Over 5 Gyrs, there is a ~1% chance this chaotic diffusion will lead to a collision between Mercury and the Sun or Venus. Such simulations have typically assumed the solar system is completely isolated, but we recently showed that small perturbations from passing field stars on the giant planets will meaningfully accelerate this chaotic diffusion. When field star encounters are included in solar system simulations, we find that stellar-triggered instabilities are nearly as likely as ones driven solely by the planets' internal dynamics. Moreover, these stellar-driven instabilities are much more likely to happen sooner and much more likely to involve the loss of more than one planet. Our simulations also reveal that stellar passages have a ~5% chance of destabilizing Pluto. I will discuss the details of this recent work in my talk.