| A primordial origin for misalignments between stellar spin axes and planetary orbits. | |
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MedLine Citation:
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PMID: 23151584 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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The existence of gaseous giant planets whose orbits lie close to their host stars ('hot Jupiters') can largely be accounted for by planetary migration associated with viscous evolution of proto-planetary nebulae. Recently, observations of the Rossiter-McLaughlin effect during planetary transits have revealed that a considerable fraction of hot Jupiters are on orbits that are misaligned with respect to the spin axes of their host stars. This observation has cast doubt on the importance of disk-driven migration as a mechanism for producing hot Jupiters. Here I show that misaligned orbits can be a natural consequence of disk migration in binary systems whose orbital plane is uncorrelated with the spin axes of the individual stars. The gravitational torques arising from the dynamical evolution of idealized proto-planetary disks under perturbations from massive distant bodies act to misalign the orbital planes of the disks relative to the spin poles of their host stars. As a result, I suggest that in the absence of strong coupling between the angular momentum of the disk and that of the host star, or of sufficient dissipation that acts to realign the stellar spin axis and the planetary orbits, the fraction of planetary systems (including systems of 'hot Neptunes' and 'super-Earths') whose angular momentum vectors are misaligned with respect to their host stars will be commensurate with the rate of primordial stellar multiplicity. |
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Authors:
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Konstantin Batygin |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Nature Volume: 491 ISSN: 1476-4687 ISO Abbreviation: Nature Publication Date: 2012 Nov |
Date Detail:
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Created Date: 2012-11-15 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0410462 Medline TA: Nature Country: England |
Other Details:
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Languages: eng Pagination: 418-20 Citation Subset: IM |
Affiliation:
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Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA. kbatygin@gps.caltech.edu |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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