The curious case of HU Aquarii - dynamically testing proposed planetary systems

Horner, Jonathan and Wittenmyer, Robert A. and Marshall, Jonathan P. and Tinney, Chris G. and Butters, Oliver W. (2012) The curious case of HU Aquarii - dynamically testing proposed planetary systems. In: 11th Australian Space Science Conference (ASSC 2011), 26-29 Sept 2011, Canberra, Australia.

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Abstract

In early 2011, the discovery of two planets moving on surprisingly extreme orbits around the eclipsing polar cataclysmic variable system HU Aquraii was announced based on variations in the timing of mutual eclipses between the two central stars. We perform a detailed dynamical analysis of the stability of the exoplanet system as proposed in that work, revealing that it is simply dynamically unfeasible. We then apply the latest rigorous methods used by the Anglo-Australian Planet Search to analyse radial velocity data to re-examine the data used to make the initial claim. Using that data, we arrive at a significantly different orbital solution for the proposed planets, which we then show through dynamical analysis to be equally unfeasible. Finally, we discuss the need for caution in linking eclipse-timing data for cataclysmic variables to the presence of planets, and suggest a more likely explanation for the observed signal.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright © 2012 National Space Society of Australia Ltd. No evidence of copyright restrictions preventing deposit of Accepted version.
Faculty / Department / School: No Faculty
Date Deposited: 09 Aug 2017 04:46
Last Modified: 15 Aug 2017 03:17
Uncontrolled Keywords: planetary systems; HU Aquarii; dynamical methods; cataclysmic variable stars
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020108 Planetary Science (excl. Extraterrestrial Geology)
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020109 Space and Solar Physics
URI: http://eprints.usq.edu.au/id/eprint/32755

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