New data and improved parameters for the extrasolar transiting planet OGLE-TR-56b

被引:63
作者
Torres, G
Konacki, M
Sasselov, DD
Jha, S
机构
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] CALTECH, Dept Geol & Planetary Sci, Pasadena, CA 91125 USA
[3] Polish Acad Sci, Nicholas Copernicus Astron Ctr, PL-87100 Torun, Poland
[4] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
关键词
binaries : eclipsing; planetary systems; stars; low-mass; brown dwarfs; techniques : radial velocities;
D O I
10.1086/421286
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report new spectroscopic observations with the Keck HIRES instrument of the recently discovered transiting planet OGLE-TR-56b. Our radial velocity measurements with errors of similar to100 m s(-1) show clear variations that are in excellent agreement with the phasing ( period and epoch) derived from the OGLE transit photometry. Careful analysis of the spectral line bisectors, along with numerical simulations of blend scenarios, supports the argument for the planetary nature of the companion. The new data, combined with measurements from the previous season, allow an improved determination of the mass of the planet, M-p = (1.45 +/- 0.23)M-Jup. All available OGLE photometry, including new measurements made during the 2003 season, have also been analyzed to derive an improved value for the planetary radius of R-p = (1.23 +/- 0.16)R-Jup. We discuss the implications of these results for the theory of extrasolar planets.
引用
收藏
页码:1071 / 1075
页数:5
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