Long-lived planetesimal discs

Details Long-lived planetesimal discs Long-lived planetesimal discs

2009-09-21

arxiv.org/abs/0909.3850v3

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

31 pages (single column, font size 10), 10 figures, 2 tables. Accepted by MNRAS. This amended version corrects minor errors in

Scientific paper

We investigate the survival of planetesimal discs over Gyr timescales, using a unified approach that is applicable to all Keplerian discs of solid bodies -- dust grains, asteroids, planets, etc. Planetesimal discs can be characterized locally by four parameters: surface density, semi-major axis, planetesimal size and planetesimal radial velocity dispersion. Any planetesimal disc must have survived all dynamical processes, including gravitational instability, dynamical chaos, gravitational scattering, physical collisions, and radiation forces, that would lead to significant evolution over its lifetime. These processes lead to a rich set of constraints that strongly restrict the possible properties of long-lived discs. Within this framework, we also discuss the detection of planetesimal discs using radial velocity measurements, transits, microlensing, and the infrared emission from the planetesimals themselves or from dust generated by planetesimal collisions.

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