A New Dynamical Method to Detect a Third Object around a Cataclysmic Variable: the FS Aurigae Case

Statistics – Applications

Scientific paper

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Scientific paper

FS Aurigae is a unusual cataclysmic variable (CV) that has two different periods, the spectroscopically determined orbital period of 85.7min (Thorstensen et al. 1996) and a photometric modulation of 205.5 min (Tovmassian et al. 2003), attributed to the freely precessing period of a magnetized dwarf. There is finally a new very long period first reported here of 900 days.
It is not easy to find a mechanism that accounts for this very long period, that is so different compare to the first two ones.
In this research we present a third body (of 50Mj) orbiting FS Aurigae as the possible explanation of a very long period observed of 900 days. This third body perturbs the inner binary by secular perturbations exerted in the eccentricity and therefore modulates the accretion rate in the CV. This type of analysis can be applied to other close binaries systems with accretion disks.
Here we discuss the possible applications to this research to other systems.

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