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Cited by 167Stellar, planetary, and galactic studiesAstronomy and Astrophysical ResearchHistory and Developments in Astronomy

LOW STELLAR OBLIQUITIES IN COMPACT MULTIPLANET SYSTEMS

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Albrecht, Simon, Winn, Joshua N., Marcy, Geoffrey W., Howard, Andrew W., Isaacson, Howard, Johnson, John A.·2013·The Astrophysical Journal
DOI 10.1088/0004-637x/771/1/11
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Abstract

We measure the sky-projected stellar obliquities (λ) in the multiple-transiting planetary systems KOI-94 and Kepler-25, using the Rossiter–McLaughlin effect. In both cases, the host stars are well aligned with the orbital planes of the planets. For KOI-94 we find λ = −11° ± 11°, confirming a recent result by Hirano and coworkers. Kepler-25 was a more challenging case, because the transit depth is unusually small (0.13%). To obtain the obliquity, it was necessary to use prior knowledge of the star's projected rotation rate and apply two different analysis methods to independent wavelength regions of the spectra. The two methods gave consistent results, λ = 7° ± 8° and −0 5 ± 5 7. There are now a total of five obliquity measurements for host stars of systems of multiple-transiting planets, all of which are consistent with spin-orbit alignment. This alignment is unlikely to be the result of tidal interactions because of the relatively large orbital distances and low planetary masses in the systems. In this respect, the multiplanet host stars differ from hot-Jupiter host stars, which commonly have large spin-orbit misalignments whenever tidal interactions are weak. In particular, the weak-tide subset of hot-Jupiter hosts has obliquities consistent with an isotropic distribution ( p = 0.6), but the multiplanet hosts are incompatible with such a distribution ( p ∼ 10 −6 ). This suggests that high obliquities are confined to hot-Jupiter systems, and provides further evidence that hot-Jupiter formation involves processes that tilt the planetary orbit.

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  • Albrecht et al. (2013) found that all five compact multi-planet systems with known obliquities are aligned with their star and the collection is inconsistent with being drawn from an isotropic obliquity distribution.

    “In a study using the five compact multi-planet systems at the time with known obliquities, Albrecht et al. (2013) found that all are aligned with their star and the collection is inconsistent with being drawn from an isotropic obliquity distribution.”

    From Origins of Hot Jupiters (2018) · cites this paper as Albrecht et al. (2013)

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Sorted by citations

Authors
Albrecht, S., Winn, J. N., Marcy, G. W., Howard, A. W., Isaacson, H., & Johnson, J. A.
Affiliations
  • Massachusetts Institute of Technology (US)
  • University of California, Berkeley (US)
  • University of Hawaiʻi at Mānoa (US)
  • California Institute of Technology (US)
ORCID
Venue
The Astrophysical Journal
Publisher
American Astronomical Society
Published
2013-06-10
Volume
771
Issue
1
Pages
11
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
DOI
10.1088/0004-637x/771/1/11
OpenAlex
W1678481872
Cited by
167
References
0
Citations by year
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FWCI
10.08
Type
journal article
Language
en
Open access
Licence
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (acceptedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-sa)
  • arXiv (Cornell University)
Funders
  • National Science Foundation (1108595)
  • National Aeronautics and Space Administration (NNX09AB33G)
  • W. M. Keck Foundation
  • California Institute of Technology
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › History and Developments in Astronomy
Keywords
stellar obliquity, Rossiter-McLaughlin effect, spin-orbit alignment, multi-planet systems, tidal interactions, stellar rotation, transiting exoplanets

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