A Dynamical Analysis of the HU Aquarii Planetary System

Details A Dynamical Analysis of the HU Aquarii Planetary System A Dynamical Analysis of the HU Aquarii Planetary System

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.3406w&link_type=abstract

American Astronomical Society, ESS meeting #2, #34.06

Astronomy and Astrophysics

Astronomy

Scientific paper

In early 2011, the surprising discovery of two giant planets orbiting
the eclipsing polar HU Aquarii was announced. We present a detailed
dynamical study of the orbital stability of the HU Aquarii planetary
system, revealing that the proposed planetary orbits are highly
dynamically unstable. In order for the planets to be dynamically stable
on timescales greater than 10000 years, they must move on significantly
different orbits than were suggested in the discovery work. In fact,
unless the orbit of the outer planet is retrograde relative to the
inner, we find that it must instead orbit well beyond the 1-sigma
uncertainties stated in that work if the system is to remain stable over
even moderate timescales. This suggests that the HU Aquarii planetary
system is either more complicated or significantly different to that
proposed, or that it is currently undergoing a significant dynamical
destabilisation. We also re-analyse the discovery data and present
alternative and more physically plausible system configurations.

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