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Misaligned spin-orbit in the XO-3 planetary system?†

Published online by Cambridge University Press:  01 May 2008

G. Hébrard ,
F. Bouchy ,
F. Pont ,
B. Loeillet ,
M. Rabus ,
X. Bonfils ,
C. Moutou ,
I. Boisse ,
X. Delfosse  and
M. Desort
...Show all authors
G. Hébrard
Affiliation:
Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, France
F. Bouchy
Affiliation:
Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, France
F. Pont
Affiliation:
Physikalisches Institut, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
B. Loeillet
Affiliation:
Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, France Laboratoire d'Astrophysique de Marseille, Univ. de Provence, CNRS (UMR 6110), France
M. Rabus
Affiliation:
Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain
X. Bonfils
Affiliation:
Centro de Astrofísica, Universidade do Porto, Portugal Laboratoire d'Astrophysique de Grenoble, CNRS (UMR 5571), Université J. Fourier, France
C. Moutou
Affiliation:
Laboratoire d'Astrophysique de Marseille, Univ. de Provence, CNRS (UMR 6110), France
I. Boisse
Affiliation:
Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, France
X. Delfosse
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS (UMR 5571), Université J. Fourier, France
M. Desort
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS (UMR 5571), Université J. Fourier, France
A. Eggenberger
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS (UMR 5571), Université J. Fourier, France
D. Ehrenreich
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS (UMR 5571), Université J. Fourier, France
T. Forveille
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS (UMR 5571), Université J. Fourier, France
A.-M. Lagrange
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS (UMR 5571), Université J. Fourier, France
C. Lovis
Affiliation:
Observatoire de Genève, Université de Genève, Switzerland
M. Mayor
Affiliation:
Observatoire de Genève, Université de Genève, Switzerland
F. Pepe
Affiliation:
Observatoire de Genève, Université de Genève, Switzerland
C. Perrier
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS (UMR 5571), Université J. Fourier, France
N. C. Santos
Affiliation:
Centro de Astrofísica, Universidade do Porto, Portugal Observatoire de Genève, Université de Genève, Switzerland
D. Queloz
Affiliation:
Observatoire de Genève, Université de Genève, Switzerland
D. Ségransan
Affiliation:
Observatoire de Genève, Université de Genève, Switzerland
S. Udry
Affiliation:
Observatoire de Genève, Université de Genève, Switzerland
A. Vidal-Madjar
Affiliation:
Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, France
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Abstract

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The SOPHIE Consortium started a large program of exoplanets search and characterization in the Northern hemisphere with the new spectrograph SOPHIE at the 1.93-m telescope of Haute-Provence Observatory, France. The objectives of this program are to characterize the zoo of exoplanets and to bring strong constraints on their processes of formation and evolution using the radial velocity technique. We present here new SOPHIE measurements of the transiting planet host star XO-3. This allowed us to observe the Rossiter-McLaughlin effect and to refine the parameters of the planet. The unusual shape of the radial velocity anomaly during the transit provides a hint for a nearly transverse Rossiter-McLaughlin effect. The sky-projected angle between the planetary orbital axis and the stellar rotation axis should be λ = 70° ± 15° to be compatible with our observations. This suggests that some close-in planets might result from gravitational interaction between planets and/or stars rather than migration. This result requires confirmation by additional observations.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S253: Transiting Planets , May 2008 , pp. 508 - 511
Copyright
Copyright © International Astronomical Union 2009

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