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Title: THE UNUSUAL QUADRUPLE SYSTEM HD 91962 WITH A “PLANETARY” ARCHITECTURE

The young nearby solar-type star HD 91962 is a rare quadruple system where three companions revolve around the main component with periods of 170.3 days, 8.85 years, and 205 years. The two outer orbits are nearly co-planar, and all orbits have small eccentricities. We refine the visual orbit of the outer pair and determine the combined spectro-interferometric orbit of the middle 8.8 year pair and the spectroscopic orbit of the inner binary. The middle and inner orbits are likely locked in a 1:19 resonance, and the ratio of the outer and middle periods is ∼23. The masses of all components are estimated (inside-out: 1.14, 0.32, 0.64, 0.64 solar mass).  The dynamical parallax is 27.4 ± 0.6 mas. We speculate that this multiple system originated from collapse of an isolated core and that the companions migrated in a dissipative disk. Other multiple systems with similar features (co-planarity, small eccentricity, and period ratio around 20) are known.
Authors:
 [1] ;  [2] ;  [3]
  1. Cerro Tololo Inter-American Observatory, Casilla 603, La Serena (Chile)
  2. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  3. U.S. Naval Observatory, 3450 Massachusetts Ave., Washington, DC (United States)
Publication Date:
OSTI Identifier:
22520216
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 149; Journal Issue: 6; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; GRAVITATIONAL COLLAPSE; INTERFEROMETRY; MAIN SEQUENCE STARS; MASS; ORBITS; RESONANCE; STAR EVOLUTION