HD 147506b: A SUPER-MASSIVE PLANET IN AN ECCENTRIC ORBIT TRANSITING A BRIGHT STAR
نویسندگان
چکیده
We report the discovery of a massive (Mp = 9.04±0.50MJup) planet transiting the bright (V = 8.7) F8 star HD 147506, with an orbital period of 5.63341±0.00013 days and an eccentricity of e = 0.520± 0.010. From the transit light curve we determine that the radius of the planet is Rp = 0.982± 0.105RJup. HD 147506b (also coined HAT-P-2b) has a mass about 9 times the average mass of previously-known transiting exoplanets, and a density of ρp = 11.9 g cm , greater than that of rocky planets like the Earth. Its mass and radius are marginally consistent with theories of structure of massive giant planets composed of pure H and He, and may require a large (& 100M⊕) core to account for. The high eccentricity causes a 9-fold variation of insolation of the planet between periand apastron. Using follow-up photometry, we find that the center of transit is Tmid = 2,454,212.8559±0.0007 (HJD), and the transit duration is 0.177± 0.002d. Subject headings: stars: individual: HD 147506 – planetary systems: individual: HD 147506b, HATP-2b
منابع مشابه
HAT-P-2b: A SUPER-MASSIVE PLANET IN AN ECCENTRIC ORBIT TRANSITING A BRIGHT STAR
We report the discovery of HAT-P-2b, a massive (Mp = 8.17 ± 0.72 MJup) planet transiting the bright (V = 8.7) F8 star HD 147506, with an orbital period of 5.63 days and an eccentricity of e = 0.5. From the transit light curve we determine that the radius of the planet is Rp = 1.18 ± 0.16 RJup. HAT-P-2b has a mass about 9 times the average mass of previously-known transiting exoplanets, and a de...
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