出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：HU Aqr is an eclipsing CV system hosting a highly magnetic white dwarf orbited by a M4V dwarf with a period of about 125 min. Its orbital ephemeris has been followed with precision since 1993. Regular OPTIMA observations of eclipses of HU Aqr since 1999 can be used to follow the secular changes of the binary orbit. We report new modeling of the orbital ephemeris including recent 2008/2009 observations and find that a model including a linear and quadratic term as well as two sinusoidal oscillatory terms provides the best fit to the observed eclipses. We propose that the sinusoidal variations can be explained by the presence of two giant planets in orbit around HU Aqr.
