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

Abstract

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

Citation Formats

Tokovinin, Andrei, Latham, David W., and Mason, Brian D., E-mail: atokovinin@ctio.noao.edu, E-mail: dlatham@cfa.harvard.edu, E-mail: bdm@usno.navy.mil. THE UNUSUAL QUADRUPLE SYSTEM HD 91962 WITH A “PLANETARY” ARCHITECTURE. United States: N. p., 2015. Web. doi:10.1088/0004-6256/149/6/195.
Tokovinin, Andrei, Latham, David W., & Mason, Brian D., E-mail: atokovinin@ctio.noao.edu, E-mail: dlatham@cfa.harvard.edu, E-mail: bdm@usno.navy.mil. THE UNUSUAL QUADRUPLE SYSTEM HD 91962 WITH A “PLANETARY” ARCHITECTURE. United States. doi:10.1088/0004-6256/149/6/195.
Tokovinin, Andrei, Latham, David W., and Mason, Brian D., E-mail: atokovinin@ctio.noao.edu, E-mail: dlatham@cfa.harvard.edu, E-mail: bdm@usno.navy.mil. Mon . "THE UNUSUAL QUADRUPLE SYSTEM HD 91962 WITH A “PLANETARY” ARCHITECTURE". United States. doi:10.1088/0004-6256/149/6/195.
@article{osti_22520216,
title = {THE UNUSUAL QUADRUPLE SYSTEM HD 91962 WITH A “PLANETARY” ARCHITECTURE},
author = {Tokovinin, Andrei and Latham, David W. and Mason, Brian D., E-mail: atokovinin@ctio.noao.edu, E-mail: dlatham@cfa.harvard.edu, E-mail: bdm@usno.navy.mil},
abstractNote = {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.},
doi = {10.1088/0004-6256/149/6/195},
journal = {Astronomical Journal (Online)},
number = 6,
volume = 149,
place = {United States},
year = {Mon Jun 15 00:00:00 EDT 2015},
month = {Mon Jun 15 00:00:00 EDT 2015}
}