WASP-8b: a retrograde transiting planet in a multiple system
Abstract
We report the discovery of WASP-8b, a transiting planet of 2.25 ± 0.08 MJup on a strongly inclined eccentric 8.15-day orbit, moving in a retrograde direction to the rotation of its late-G host star. Evidence is found that the star is in a multiple stellar system with two other companions. The dynamical complexity of the system indicates that it may have experienced secular interactions such as the Kozai mechanism or a formation that differs from the “classical” disc-migration theory.
Based on observations made with HARPS spectrograph on the 3.6-m ESO telescope and the EULER Swiss telescope at La Silla Observatory, Chile.Radial velocity data are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/517/L1- Publication:
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Astronomy and Astrophysics
- Pub Date:
- July 2010
- DOI:
- arXiv:
- arXiv:1006.5089
- Bibcode:
- 2010A&A...517L...1Q
- Keywords:
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- stars: individual: WASP-8;
- techniques: photometric;
- techniques: spectroscopic;
- planet-star interactions;
- planetary systems;
- techniques: radial velocities;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- A&