期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 63, 期 6, 页码 L57-L61出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/63.6.L57
关键词
stars: planetary systems: individual (XO-3); stars: rotation; techniques: radial velocities; techniques: spectroscopic
资金
- Japan Society for Promotion of Science (JSPS) [DCI: 22-5935]
- NINS
- NASA [NNX11AG85G]
- Keck PI Data Analysis Fund
- Ministry of Education, Science, Sports and Culture [22000005]
- Global Collaborative Research Fund (GCRF)
- Princeton University
We report on observations of the Rossiter-McLaughlin (RM) effect for the XO-3 exoplanetary system. The RM effect for the system was previously measured by two different groups, but their results were statistically inconsistent. To obtain a decisive result, we observed two full transits of XO-3b with the Subaru 8.2-m telescope. By modeling these data with a new and more accurate analytic formula for the RM effect, we found the projected spin orbit angle to be lambda = 37.degrees 3 +/- 3.degrees 0, in good agreement with a previous finding by Winn et al. (2009 ApJ, 700, 302). In addition, an offset of similar to 22 ms(-1) was observed between the two transit datasets. This offset could be a signal of a third body in the XO-3 system, a possibility that should be checked with future observations. We also attempted to search for a possible signature of the stellar differential rotation in the RM data for the first time, and put weak upper limits on the differential rotation parameters.
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