Secular changes in the orbits of the quadruple system VW LMi
arXiv:2003.08169 · doi:10.1093/mnras/staa699
Abstract
VW~LMi is the tightest known quadruple system with 2+2 hierarchy. It consists of a W UMa-type eclipsing binary (P12 = 0.47755 days) and another detached non-eclipsing binary (P34 = 7.93 days) orbiting around a common center of mass is about P1234 = 355 days. We present new observations of the system extending the time baseline to study long-term perturbations in the system and to improve orbital elements. The multi-dataset modeling of the system (4 radial-velocity curves for the components and the timing data) clearly showed an apsidal motion in the non-eclipsing binary at a rate of 4.6 degrees/yr, but no other perturbations. This is consistent with the nearly co-planarity of the outer, 355-day orbit, and the 7.93-day orbit of the non-eclipsing binary. Extensive N-body simulations enabled us to constrain the mutual inclination of the non-eclipsing binary and the outer orbits to j34-1234 < 10 degrees.
arXiv comment12 pages, 7 figures, MNRAS in press
References in corpus (13)
- Gaia Data Release 2. Summary of the contents and survey properties
- IAS15: A fast, adaptive, high-order integrator for gravitational dynamics, accurate to machine precision over a billion orbits
- The Hipparcos-Gaia Catalog of Accelerations
- Comparative statistics and origin of triple and quadruple stars
- The Updated Multiple Star Catalog
- Absolute Magnitude Calibration for the W UMa-type Systems Based on Hipparcos Data
- Eclipse Timing Variation Analyses of Eccentric Binaries with Close Tertiaries in the Kepler field
- A Fast Algorithm for Cosmic Rays Removal from Single Images
- Radial Velocity Studies of Close Binary Stars. XI
- PHASES Differential Astrometry and the Mutual Inclination of the V819 Herculis Triple Star System
- VW LMi: tightest quadruple system known. Light-time effect and possible secular changes of orbits
- Spectroscopic metallicity determinations for W~UMa-type binary stars
- Absolute Magnitude Calibration for W UMa-Type Systems Based on Gaia Data
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