Planet-Planet Scattering Alone Cannot Explain the Free-Floating Planet Population
Language
en
Article de revue
This item was published in
Monthly Notices of the Royal Astronomical Society. 2012, vol. 421, n° 1, p. L117-L121
Oxford University Press (OUP): Policy P - Oxford Open Option A
English Abstract
Recent gravitational microlensing observations predict a vast population of free-floating giant planets that outnumbers main sequence stars almost twofold. A frequently-invoked mechanism for generating this population is ...Read more >
Recent gravitational microlensing observations predict a vast population of free-floating giant planets that outnumbers main sequence stars almost twofold. A frequently-invoked mechanism for generating this population is a dynamical instability that incites planet-planet scattering and the ejection of one or more planets in isolated main sequence planetary systems. Here, we demonstrate that this process alone probably cannot represent the sole source of these galactic wanderers. By using straightforward quantitative arguments and N-body simulations, we argue that the observed number of exoplanets exceeds the plausible number of ejected planets per system from scattering. Thus, other potential sources of free-floaters, such as planetary stripping in stellar clusters and post-main-sequence ejection, must be considered.Read less <
English Keywords
Astrophysics
Earth and Planetary Astrophysics
Origin
Hal imported