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Rossiter-McLaughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems
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Brown, D. J. A., Triaud, A. H. M. J., Doyle, A. P., Gillon, M., Lendl, M., Anderson, D. R., Cameron, A. Collier, Hébrard, G., Hellier, C., Lovis, C., Maxted, P. F. L., Pepe, F., Pollacco, Don, Queloz, Didier and Smalley, B. (2016) Rossiter-McLaughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems. Monthly Notices of the Royal Astronomical Society . stw2316. doi:10.1093/mnras/stw2316 (In Press)
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Official URL: http://dx.doi.org/10.1093/mnras/stw2316
Abstract
We present new measurements of the projected spin–orbit angle λ for six WASP hot Jupiters, four of which are new to the literature (WASP-61, -62, -76, and -78), and two of which are new analyses of previously measured systems using new data (WASP-71, and -79). We use three different models based on two different techniques: radial velocity measurements of the Rossiter-McLaughlin effect, and Doppler tomography. Our comparison of the different models reveals that they produce projected stellar rotation velocities (vvsin Is) measurements often in disagreement with each other and with estimates obtained from spectral line broadening. The Boué model for the Rossiter-McLaughlin effect consistently underestimates the value of vvsin Is compared to the Hirano model. Although vvsin Is differed, the effect on λ was small for our sample, with all three methods producing values in agreement with each other. Using Doppler tomography, we find that WASP-61 b (λ=4.0∘+17.1−18.4λ=4.0−18.4∘+17.1), WASP-71 b (λ=−1.9∘+7.1−7.5λ=−1.9−7.5∘+7.1), and WASP-78 b (λ = −6.4° ± 5.9) are aligned. WASP-62 b (λ=19.4∘+5.1−4.9λ=19.4−4.9∘+5.1) is found to be slightly misaligned, while WASP-79 b (λ=−95.2∘+0.9−1.0λ=−95.2−1.0∘+0.9) is confirmed to be strongly misaligned and has a retrograde orbit. We explore a range of possibilities for the orbit of WASP-76 b, finding that the orbit is likely to be strongly misaligned in the positive λ direction.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||||
| Divisions: | Faculty of Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Planetary systems, Stars -- Rotation, Photometry | ||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||
| Publisher: | Oxford University Press | ||||||
| ISSN: | 0035-8711 | ||||||
| Official Date: | 15 September 2016 | ||||||
| Dates: |
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| Date of first compliant deposit: | 11 October 2016 | ||||||
| Article Number: | stw2316 | ||||||
| DOI: | 10.1093/mnras/stw2316 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | In Press | ||||||
| Access rights to Published version: | Open Access | ||||||
| Funder: | University of Warwick, University of Keele, University of St. Andrews, Royal Greenwich Observatory. Isaac Newton Group of Telescopes (Santa Cruz de la Palma, Canary Islands), Instituto de Astrofísica de Canarias, Observatoire de Haute-Provence, UK Space Agency (UKSA), Seventh Framework Programme (European Commission) (FP7), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), United States. National Aeronautics and Space Administration (NASA) | ||||||
| Grant number: | Grant agreement 313014 (ETAEARTH) (FP7), PBGEP2-145594 (SNSF) |
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