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A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b

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Brothwell, R. D., Watson, C. A., Hebrard, G., Triaud, A. H. M. J., Cegla, H. M., Santerne, A., Hebrard, E., Anderson, D. R., Pollacco, Don, Simpson, E. K. et al.
(2014) A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b. Monthly Notices of the Royal Astronomical Society, Volume 440 (Number 4). pp. 3392-3401. doi:10.1093/mnras/stu520 ISSN 0035-8711.

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Official URL: http://dx.doi.org/10.1093/mnras/stu520

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Abstract

We present Rossiter–McLaughlin observations of WASP-13b and WASP-32b and determine the sky-projected angle between the normal of the planetary orbit and the stellar rotation axis (λ). WASP-13b and WASP-32b both have prograde orbits and are consistent with alignment with measured sky-projected angles of λ=8∘+13−12 and λ=−2∘+17−19, respectively. Both WASP-13 and WASP-32 have Teff < 6250 K, and therefore, these systems support the general trend that aligned planetary systems are preferentially found orbiting cool host stars. A Lomb–Scargle periodogram analysis was carried out on archival SuperWASP data for both systems. A statistically significant stellar rotation period detection (above 99.9 per cent confidence) was identified for the WASP-32 system with Prot = 11.6 ± 1.0 days. This rotation period is in agreement with the predicted stellar rotation period calculated from the stellar radius, R*, and vsin i if a stellar inclination of i* = 90° is assumed. With the determined rotation period, the true 3D angle between the stellar rotation axis and the planetary orbit, ψ, was found to be ψ = 11° ± 14°. We conclude with a discussion on the alignment of systems around cool host stars with Teff < 6150 K by calculating the tidal dissipation time-scale. We find that systems with short tidal dissipation time-scales are preferentially aligned and systems with long tidal dissipation time-scales have a broad range of obliquities.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 0035-8711
Official Date: 1 June 2014
Dates:
DateEvent
1 June 2014Published
17 April 2014Available
12 March 2014Accepted
25 November 2013Submitted
Volume: Volume 440
Number: Number 4
Page Range: pp. 3392-3401
DOI: 10.1093/mnras/stu520
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Open Access Version:
  • ArXiv

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