Orbital Stability of Proposed NY Virginis Exoplanets

Abstract

Er et al. (2021) recently proposed a two-planet solution to account for eclipse timing variations (ETVs) observed from the sdB binary NY Virginis. We tested the proposed planetary system for orbit stability using both numerical simulations and chaotic behavior analysis. The best-fit orbits, as well as those with parameters varying by the published uncertainty range in each parameter, were unstable on a timescale much less than the presumed lifetime of the PCEB phase ($\sim$100 Myr). suggesting that the proposed circumbinary companions fail to provide a complete explanation for the observed ETVs.

4 pages, 3 figures

References in corpus (5)

• Hybrid Symplectic Integrators for Planetary Dynamics
• Internal magnetic fields, spin-orbit coupling, and orbital period modulation in close binary systems
• Revisiting the analysis of HW Vir eclipse timing data I. A frequentist data modeling approach and a dynamical stability analysis
• New Observations of the Eclipsing Binary System NY Vir and its Candidate Circumbinary Planets
• A new photometric and dynamical study of the eclipsing binary star HW Virginis