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Record 4 of 3850
Orbital coplanarity in solar-type binary systems: Implications for planetary system formation and detection
External Online Source: doi:10.1086/116855
Author and Affiliation:
Hale, Alan(New Mexico State Univ., Las Cruces, NM, United States)
Abstract: The equatorial inclinations of solar-type stars within visual binary systems are computed by combining v sin i measurements with rotational period information, or with expected rotational velocities based upon the age of the star in question. These inclinations are then compared with the orbital inclinations of the systems to test the alignment between the equatorial and orbital planes, and how the tendency for or against coplanarity varies as a function of parameters such as spectral type, separation, eccentricity, etc. The results are extended to planetary systems in order to determine the appropriateness of basing planetary search strategies upon a parent star's equatorial inclination, and to address issues in planetary system formation and evolution, including the stability of planetary orbits within binary systems. During the course of this project new or improved v sin i measurements are made for over 30 solar-type stars within binary systems, and (for the purposes of the study) tentative orbits are computed for thirteen long-period systems. The results suggest that approximate coplanarity between the equatorial and orbital planes exists solar-type binary systems with separations less than 30-40 AU. The coplanarity tendency, as well as this 'critical separation,' is not significantly affected by most of the other parameters studied. The one significant exception occurs with hierarchical multiple systems, where noncoplanarity may exist at relatively small separations. If it is assumed that planetary distances in our solar system are typical, the results suggest there is no reason to expect planets to orbit in planes significantly different from that of the parent star's equator, in turn suggesting that planetary formation models and search strategies dependent upon this assumption are valid from this standpoint. The results also suggest that noncoplanarity between the components of a binary system is not a significant issue in addressing the stability of planetary orbits within the system.
Publication Date: Jan 01, 1994
Document ID:
19950033134
(Acquired Dec 28, 1995)
Accession Number: 95A64733
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: The Astronomical Journal (ISSN 0004-6256); 107; 1; p. 306-332
Publisher Information: United States
Contract/Grant/Task Num: NGT-40019
Financial Sponsor: NASA; United States
Organization Source: NASA; Washington, DC, United States
Description: 27p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: BINARY STARS; COPLANARITY; PLANETARY EVOLUTION; PLANETARY ORBITS; PLANETARY SYSTEMS; EQUATORS; LINE SPECTRA; ORBITAL VELOCITY; PLANETARY ROTATION; STAR FORMATION
Imprint And Other Notes: The Astronomical Journal vol. 107, no. 1 p. 306-332 January 1994
Availability Source: Other Sources
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