Orbits of Five Triple Stars
Andrei Tokovinin, David Latham
TL;DR
This study analyzes the orbital parameters of five hierarchical triple star systems using combined radial velocity and positional data, revealing diverse orbital configurations including coplanar and highly inclined systems.
Contribution
It provides detailed orbital elements and mutual inclination measurements for five triple star systems, enhancing understanding of their dynamical structures.
Findings
Inner and outer orbital periods are determined for all five systems.
One system exhibits coplanar, quasi-circular orbits similar to planetary hierarchies.
Another system has a mutual inclination of 131 degrees, indicating a highly inclined orbit.
Abstract
Joint analysis of radial velocities and position measurements of five hierarchical stellar systems is undertaken to determine elements of their inner and outer orbits and, whenever possible, their mutual inclinations. The inner and outer periods are 12.9 and 345 yr for HD 12376 (ADS 1613), 1.14 and ~1500 yr for HD 19971 (ADS 2390), 8.3 and 475 yr for HD 89795 (ADS 7338), 1.11 and 40 yr for HD 152027, 0.69 and 7.4 yr for HD 190412. The latter system with its co-planar and quasi-circular orbits belongs to the family of compact planetary-like hierarchies, while the orbits in HD 12376 have mutual inclination of 131 degrees.
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