The Pulsating sdB+M Eclipsing System NY Virginis and its Circumbinary Planets

Abstract

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, $M_3\sin i_3$ = 2.8 M${}_{\mathrm{Jup}}$ and $M_4\sin i_4$ = 4.5 M${}_{\mathrm{Jup}}$, 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.

arXiv comment14 pages, including 5 figures and 4 tables, accepted for publication in MNRAS

References in corpus (25)

• Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
• The sdB+M Eclipsing System HW Virginis and its Circumbinary Planets
• A dynamical analysis of the proposed HU Aquarii planetary system
• Circumbinary Planets Orbiting the Rapidly Pulsating Subdwarf B-type binary NY Vir
• The binary properties of the pulsating subdwarf B eclipsing binary PG 1336-018 (NY Vir)
• On the dynamical stability of the proposed planetary system orbiting NSVS 14256825
• A Detailed Dynamical Investigation of the Proposed QS Virginis Planetary System
• The quest for companions to post-common envelope binaries: III. A reexamination of HW Virginis
• A Dynamical Analysis of the Proposed Circumbinary HW Virginis Planetary System
• Two possible circumbinary planets in the eclipsing post-common envelope system NSVS 14256825
• Revisiting the proposed planetary system orbiting the eclipsing polar HU Aquarii
• The DWARF project: Eclipsing binaries - precise clocks to discover exoplanets
• Detection of a tertiary brown dwarf companion in the sdB-type eclipsing binary HS 0705+6700
• A Detailed Investigation of the Proposed NN Serpentis Planetary System
• An evolutionary study of the pulsating subdwarf B eclipsing binary PG1336-018 (NY Vir)
• Timing variations in the secondary eclipse of NN Ser
• The sub-Saturn Mass Transiting Planet HAT-P-12b
• The Period Variation of and a Spot Model for the Eclipsing Binary AR Bootis
• Revisiting the proposed circumbinary multi-planet system NSVS14256825
• The Proposed Quadruple System SZ Herculis: Revised LITE Model and Orbital Stability Study
• Second generation planets
• Physical Properties of the Transiting Planetary System TrES-3
• The Algol System SZ Herculis: Physical Nature and Orbital Behavior
• Mechanic: the MPI/HDF code framework for dynamical astronomy
• On the RZ Draconis Sub-stellar Circumbinary Companions Stability Study of the Proposed Sub-stellar Circumbinary System

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• A quantitative in-depth analysis of the prototype sdB+BD system SDSS J08205+0008 revisited in the Gaia era
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• DE CVn: an eclipsing post-common envelope binary with a circumbinary disk and a giant planet
• The Kepler Eclipsing System KIC 5621294 and its Substellar Companion
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