HD 147506b: A Supermassive Planet in an Eccentric Orbit Transiting a Bright Star
HD 147506b: A Supermassive Planet in an Eccentric Orbit Transiting a Bright Star
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DOI：
10.1086/521866
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发表时间：
2007-05
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通讯作者：
G. Bakos;G. Kovacs;G. Torres;D. Fischer;D. Latham;R. Noyes;D. Sasselov;T. Mazeh;Avi Shporer;R. P. Butler;R. Stefanik;J. Fernández;A. Sozzetti;A. Pál;J. Johnson;G. Marcy;J. Winn;B. Sipocz;J. Lázár;I. Papp;P. Sári
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作者：
G. Bakos;G. Kovacs;G. Torres;D. Fischer;D. Latham;R. Noyes;D. Sasselov;T. Mazeh;Avi Shporer;R. P. Butler;R. Stefanik;J. Fernández;A. Sozzetti;A. Pál;J. Johnson;G. Marcy;J. Winn;B. Sipocz;J. Lázár;I. Papp;P. Sári
我们发现了一颗大质量(Mp=9.04±0.50MJ)行星凌日明亮的(V=8.7)F8恒星HD 147506，其轨道周期为5.63341±0.00013天，偏心率e=0.520±0.010。根据过境光曲线，我们确定行星的半径为Rp=0.982 rJ。HD 147506b(也称为HAT-P-2b)的质量约为已知凌日系外行星平均质量的9倍，密度为ρp≈12g cm-3，大于地球等岩石行星的密度。它的质量和半径与由纯H和He组成的大质量巨行星的结构理论略有一致，要解释它们可能需要一个大的(≳100M⊕)核心。高偏心率导致行星在近星和近星之间的日照强度变化了九倍。经跟踪测光，中转中心为TMID=2,454,212.8559±0.0007(HJD)，中转持续时间为0.177±0.002天。
We report the discovery of a massive (Mp = 9.04 ± 0.50 MJ) 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 RJ. 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 ≈ 12 g cm-3, 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 accounting for them may require a large (≳100 M⊕) core. The high eccentricity causes a ninefold variation of insolation of the planet between peri- and 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 ± 0.002 days.