Journal Article

The spin-orbit angle of the transiting hot Jupiter CoRoT-1b<sup>⋆</sup>

F. Pont, M. Endl, W. D. Cochran, S. I. Barnes, C. Sneden, P. J. MacQueen, C. Moutou, S. Aigrain, R. Alonso, A. Baglin, F. Bouchy, M. Deleuil, M. Fridlund, G. Hébrard, A. Hatzes, T. Mazeh and A. Shporer

in Monthly Notices of the Royal Astronomical Society: Letters

Published on behalf of The Royal Astronomical Society

Volume 402, issue 1, pages L1-L5
Published in print February 2010 |
Published online February 2010 | e-ISSN: 1745-3933 | DOI: http://dx.doi.org/10.1111/j.1745-3933.2009.00785.x

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Abstract

We measure the angle between the planetary orbit and the stellar rotation axis in the transiting planetary system CoRoT-1, with new HIRES/Keck and FORS/VLT high-accuracy photometry. The data indicate a highly tilted system, with a projected spin-orbit angle λ= 77°± 11°. Systematic uncertainties in the radial velocity data could cause the actual errors to be larger by an unknown amount, and this result needs to be confirmed with further high-accuracy spectroscopic transit measurements. Spin-orbit alignment has now been measured in a dozen extra-solar planetary systems, and several show strong misalignment. The first three misaligned planets were all much more massive than Jupiter and followed eccentric orbits. CoRoT-1, however, is a jovian-mass close-in planet on a circular orbit. If its strong misalignment is confirmed, it would break this pattern. The high occurrence of misaligned systems for several types of planets and orbits favours planet–planet scattering as a mechanism to bring gas giants on very close orbits.

Keywords: techniques: photometric; techniques: radial velocities; stars: individual: CoRoT-Exo-1, CoRoT-1; planetary systems

Journal Article.  3157 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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