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Title:
The spin-orbit alignment of the transiting exoplanet WASP-3b from Rossiter-McLaughlin observations
Authors:
Simpson, E. K.; Pollacco, D.; Hébrard, G.; Gibson, N. P.; Barros, S. C. C.; Boisse, I.; Bouchy, F.; Collier Cameron, A.; Miller, G. R. M.; Watson, C. A.; Keenan, F. P.
Affiliation:
AA(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), AB(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), AC(Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98 bis bvd. Arago, 75014 Paris, France), AD(School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL), AE(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), AF(Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98 bis bvd. Arago, 75014 Paris, France), AG(Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98 bis bvd. Arago, 75014 Paris, France; Observatoire de Haute-Provence, CNRS/OAMP, 04870 StMichel l'Observatoire, France), AH(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AI(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AJ(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), AK(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 405, Issue 3, pp. 1867-1872. (MNRAS Homepage)
Publication Date:
07/2010
Origin:
WILEY
Astronomy Keywords:
stars: planetary systems, stars: individual: WASP-3, techniques: radial velocities, techniques: photometric
Abstract Copyright:
(c) Journal compilation © 2010 RAS
DOI:
10.1111/j.1365-2966.2010.16576.x
Bibliographic Code:
2010MNRAS.405.1867S

Abstract

We present an observation of the Rossiter-McLaughlin effect for the planetary system WASP-3. Radial velocity measurements were made during transit using the SOPHIE spectrograph at the 1.93-m telescope at Haute-Provence Observatory. The shape of the effect shows that the sky-projected angle between the stellar rotation axis and planetary orbital axis (λ) is small and consistent with zero within . WASP-3b joins the ~two-thirds of planets with measured spin-orbit angles that are well aligned and are thought to have undergone a dynamically gentle migration process such as planet-disc interactions. We find a systematic effect which leads to an anomalously high determination of the projected stellar rotational velocity (vsini = 19.6+2.2-2.1kms-1) compared to the value found from spectroscopic line broadening (vsini = 13.4 +/- 1.5kms-1). This is thought to be caused by a discrepancy in the assumptions made in the extraction and modelling of the data. Using a model developed by Hirano et al. designed to address this issue, we find vsini to be consistent with the value obtained from spectroscopic broadening measurements (vsini = 15.7+1.4-1.3kms-1).

Based on observations collected with the SOPHIE spectrograph on the 1.93-m telescope at Observatoire de Haute-Provence (CNRS), France, by the SOPHIE Consortium (program 08B.PNP.SIMP).

E-mail: esimpson05@qub.ac.uk

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