期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 402, 期 1, 页码 L1-L5出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2009.00785.x
关键词
techniques: photometric; techniques: radial velocities; stars: individual: CoRoT-Exo-1; CoRoT-1; planetary systems
资金
- Science and Technology Facilities Council [ST/G002266/1] Funding Source: researchfish
- STFC [ST/G002266/1] Funding Source: UKRI
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 lambda = 77 degrees +/- 11 degrees. 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.
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