The spin-orbit angle of the transiting hot jupiter CoRoT-1b - Astrophysics > Earth and Planetary AstrophysicsReport as inadecuate




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Abstract: We measure the angle between the planetary orbit and the stellar rotationaxis in the transiting planetary system CoRoT-1, with new HIRES-Keck andFORS-VLT high-accuracy photometry. The data indicate a highly tilted system,with a projected spin-orbit angle lambda = 77 +- 11 degrees. Systematicuncertainties in the radial velocity data could cause the actual errors to belarger by an unknown amount, and this result needs to be confirmed with furtherhigh-accuracy spectroscopic transit measurements.Spin-orbit alignment has now been measured in a dozen extra-solar planetarysystems, and several show strong misalignment. The first three misalignedplanets 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 itsstrong misalignment is confirmed, it would break this pattern. The highoccurence of misaligned systems for several types of planets and orbits favoursplanet-planet scattering as a mechanism to bring gas giants on very closeorbits.



Author: 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,

Source: https://arxiv.org/







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