Circumbinary Planet(s?) at NY Vir

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Circumbinary Planet(s?) at NY Vir

Post by Sirius_Alpha on 19th December 2011, 9:31 pm

Circumbinary Planets Orbiting the Rapidly Pulsating Subdwarf B-type binary NY Vir
http://arxiv.org/abs/1112.4269

We report here the tentative discovery of a Jovian planet in orbit around the rapidly pulsating subdwarf B-type (sdB-type) eclipsing binary NY Vir. By using new determined eclipse times together with those collected from the literature, we detect that the observed-calculated (O-C) curve of NY Vir shows a small-amplitude cyclic variation with a period of 7.9\,years and a semiamplitude of 6.1\,s, while it undergoes a downward parabolic change (revealing a period decrease at a rate of $\dot{P}=-9.2\times{10^{-12}}$). The periodic variation was analyzed for the light-travel time effect via the presence of a third body. The mass of the tertiary companion was determined to be $M_3\sin{i^{\prime}}=2.3(\pm0.3)$\,$M_{Jupiter}$ when a total mass of 0.60\,$M_{\odot}$ for NY Vir is adopted. This suggests that it is most probably a giant circumbinary planet orbiting NY Vir at a distance of about 3.3 astronomical units (AU). Since the rate of period decrease can not be explained by true angular momentum loss caused by gravitational radiation or/and magnetic braking, the observed downward parabolic change in the O-C diagram may be only a part of a long-period (longer than 15 years) cyclic variation, which may reveal the presence of another Jovian planet ($\sim2.5$$M_{Jupiter}$) in the system.

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Re: Circumbinary Planet(s?) at NY Vir

Post by Edasich on 20th December 2011, 10:35 am

Nice to see so much cataclysmic variables and dwarf novae hosting even multi-planet system.

Next I bet to be exoplanet hosts may be QS Vir, OY Car, RR Cae and UU Aqr.
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Re: Circumbinary Planet(s?) at NY Vir

Post by Sirius_Alpha on 17th September 2014, 8:37 pm

The Pulsating sdB+M Eclipsing System NY Virginis and its Circumbinary Planets
http://arxiv.org/abs/1409.4907

We searched for circumbinary planets orbiting NY Vir in historical eclipse times including our long-term CCD data. Sixty-eight times of minimum light with accuracies better than 10 s were used for the ephemeris computations. The best fit to those timings indicated that the orbital period of NY Vir has varied due to a combination of two sinusoids with periods of P 3 =8.2 yr and P 4 =27.0 yr and semi-amplitudes of K 3 =6.9 s and K 4 =27.3 s, respectively. The periodic variations most likely arise from a pair of light-time effects due to the presence of third and fourth bodies that are gravitationally bound to the eclipsing pair. We have derived the orbital parameters and the minimum masses, M 3 sini 3 = 2.8 M Jup and M 4 sini 4 = 4.5 M Jup , of both objects. A dynamical analysis suggests that the outer companion is less likely to orbit the binary on a circular orbit. Instead we show that future timing data might push its eccentricity to moderate values for which the system exhibits long-term stability. The results demonstrate that NY Vir is probably a star-planet system, which consists of a very close binary star and two giant planets. The period ratio P 3 /P 4 suggests that a long-term gravitational interaction between them would result in capture into a nearly 3:10 mean motion resonance. When the presence of the circumbinary planets is verified and understood more comprehensively, the formation and evolution of this planetary system should be advanced greatly.

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Re: Circumbinary Planet(s?) at NY Vir

Post by Lazarus on 18th September 2014, 3:59 pm

So finally they start doing dynamical analysis in the discovery papers. Still would be nice to have some other way of checking that these variations are actually due to planets. I guess the dynamical timescales for planet-planet interactions are too long to observe for any of the proposed PCEB planetary systems.
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Re: Circumbinary Planet(s?) at NY Vir

Post by Sirius_Alpha on 1st August 2016, 10:17 pm

Everyone, try to keep back your shock and surprise.

Observing NY Vir and the quest for circumbinary planets
http://arxiv.org/abs/1608.00078

We add 9 new observations of NY Vir and identify four others from AASVO database. Our results indicate that the one and two exo-planet predictions made by earlier authors do match these new results.

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