Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 63, Issue 6, Pages L67-L71Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/63.6.L67
Keywords
stars: binaries: general; stars: planetary systems: individual (XO-2); stars: rotation; techniques: radial velocities; techniques: spectroscopic
Categories
Funding
- NINS
- Japan Society for Promotion of Science (JSPS) [DC1: 22-5935]
- Ministry of Education, Culture, Sports, Science and Technology [22000005]
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We present precise radial velocities of XO-2 taken with the Subaru HDS, covering two transits of XO-2b with an interval of nearly two years. The data suggest that the orbital eccentricity of XO-2b is consistent with zero within 2 sigma (e = 0.045 +/- 0.024), and that the orbit of XO-2b is prograde (the sky-projected spin orbit alignment angle lambda = 10 degrees +/- 72 degrees). The poor constraint of lambda is due to a small impact parameter (the orbital inclination of XO-2b is almost 90 degrees). The data also provide an improved estimate of the mass of XO-2b as 0.62 +/- 0.02 M-Jup. Further, we find a long-term radial velocity variation in this system. Additional radial velocity measurements are necessary to specify the cause of this additional variation.
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