Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 414, Issue 1, Pages L16-L20Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2011.01045.x
Keywords
binaries: close; binaries: eclipsing; stars: individual: HU Aqr; planetary systems; white dwarfs
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Funding
- Chinese Natural Science Foundation [10973037, 10903026, 11003040]
- National Key Fundamental Research Project [2007CB815406]
- Yunnan Natural Science Foundation [2008CD157]
- West Light Foundation of the Chinese Academy of Sciences
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Using the precise times of mid-egress of the eclipsing polar HU Aqr, we discovered that this polar is orbited by two or more giant planets. The two planets detected so far have masses of at least 5.9 and 4.5M(Jup). Their respective distances from the polar are 3.6 and 5.4 au with periods of 6.54 and 11.96 yr, respectively. The observed rate of decrease of period derived from the downward parabolic change in the observed - calculated (O - C) curve is a factor of 15 larger than the value expected for gravitational radiation. This indicates that it may be only a part of a long-period cyclic variation, revealing the presence of one more planet. It is interesting to note that the two detected circumbinary planets follow the Titus-Bode law of solar planets with n = 5 and 6. We estimate that another 10 yr of observations will reveal the presence of the predicted third planet.
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