LX Ser - Another circumbinary planet from eclipse timing variations

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LX Ser - Another circumbinary planet from eclipse timing variations

Post by Sirius_Alpha on 29th November 2016, 9:55 pm

A possible giant planet orbiting the cataclysmic variable LX Ser
https://arxiv.org/abs/1611.09504

LX Ser is a deeply eclipsing cataclysmic variable with an orbital period of 0.d1584325. Sixty two new eclipse times were determined by our observations and the AAVSO International Data base. Combining all available eclipse times, we analyzed the O-C behavior of LX Ser. We found that the O-C diagram of LX Ser shows a sinusoidal oscillation with a period of 22.8 yr and an amplitude of 0.00035 days. Two mechanisms (i.e., the Applegate mechanism and the light travel time effect) are applied to explain the cyclic modulation. We found that the Applegate mechanism is difficult to explain the cyclic oscillation in the orbital period. Therefore, the cyclic period change is most likely to be caused by the light travel time effect due to the presence of a third body. The mass of the tertiary component was determined to be M3∼7.5MJup. We supposed that the tertiary companion is plausible a giant planet. The stability of the giant planet was checked, and we found that the multiple system is stable.

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Re: LX Ser - Another circumbinary planet from eclipse timing variations

Post by Lazarus on 30th November 2016, 3:41 pm

Despite the fact that NN Serpentis seems to still be holding up, I'm still rather sceptical about the reality of many of these planets, particularly in systems where the components are actively undergoing mass transfer.
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Re: LX Ser - Another circumbinary planet from eclipse timing variations

Post by Sirius_Alpha on 30th November 2016, 6:02 pm

I agree completely.
Also, for anyone interested, this paper from 2003 has information about the masses of the two stars (which I didn't see in the paper from the original post).

A spectroscopic search for faint secondaries in cataclysmic variables
https://arxiv.org/abs/astro-ph/0302507

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Re: LX Ser - Another circumbinary planet from eclipse timing variations

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