HAT-P-24b: AN INFLATED HOT JUPITER ON A 3.36 DAY PERIOD TRANSITING A HOT, METAL-POOR STAR
HAT-P-24b: AN INFLATED HOT JUPITER ON A 3.36 DAY PERIOD TRANSITING A HOT, METAL-POOR STAR
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DOI：
10.1088/0004-637x/725/2/2017
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发表时间：
2010-08
期刊：
影响因子：
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通讯作者：
D. Kipping;G. Bakos;J. Hartman;G. Torres;Avi Shporer;D. Latham;G. Kovacs;R. Noyes;A. Howard;D. Fischer;J. Johnson;G. Marcy;B. Béky;G. Perumpilly;G. Esquerdo;D. Sasselov;R. Stefanik;J. Lázár;I. Papp;P. L. S. C. F. Astrophysics;D. Physics;University College London;Nsf Fellow;Las Cumbres Observatory;U. California;Santa Barbara;K. Observatory;Berkeley;D. Astronomy;Yale University;C. I. O. Technology.;Dept. of Astrophysics;Hungarian Astronomical Association
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文献类型：
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作者：
D. Kipping;G. Bakos;J. Hartman;G. Torres;Avi Shporer;D. Latham;G. Kovacs;R. Noyes;A. Howard;D. Fischer;J. Johnson;G. Marcy;B. Béky;G. Perumpilly;G. Esquerdo;D. Sasselov;R. Stefanik;J. Lázár;I. Papp;P. L. S. C. F. Astrophysics;D. Physics;University College London;Nsf Fellow;Las Cumbres Observatory;U. California;Santa Barbara;K. Observatory;Berkeley;D. Astronomy;Yale University;C. I. O. Technology.;Dept. of Astrophysics;Hungarian Astronomical Association
我们报告发现了 HAT-P-24b，一颗凌日系外行星，绕中等明亮的 V = 11.818 F8 矮星 GSC 0774−01441 运行，周期 P = 3.3552464 ± 0.0000071 天，凌日历元 Tc = 2455216.97669 ± 0.00024 (BJD)11，过境时间为 3.653 ± 0.025 小时。主星质量为 1.191 ± 0.042 M☉，半径为 1.317 ± 0.068 R☉，有效温度为 6373 ± 80 K，金属丰度较低为 [Fe/H] = -0.16 ± 0.08。行星伴星的质量为 0.681 ± 0.031 MJ，半径为 1.243 ± 0.072 RJ，平均密度为 0.439 ± 0.069 g cm-3。通过使用不同的参数集重复我们的全局拟合，我们对先前匈牙利制造的自动望远镜行星发现所使用的拟合技术进行了严格的研究。我们发现系统属性对于先验的选择是稳健的。还检查了固定肢体与装配肢体变暗的效果。 HAT-P-24b 可能保持 e = 0.052+0.022−0.017 的小偏心率，这在圆形轨道模型上被接受，误报概率为 5.8%。在没有偏心泵浦的情况下，这一结果表明 HAT-P-24b 经历的潮汐耗散比木星少。由于恒星旋转相对较快，我们估计 HAT-P-24b 应该表现出已知最大的系外行星罗西特-麦克劳林效应振幅之一（ΔVRM ≃ 95 m s−1），因此应该可以精确测量天空投影的自旋轨道对齐。
We report the discovery of HAT-P-24b, a transiting extrasolar planet orbiting the moderately bright V = 11.818 F8 dwarf star GSC 0774−01441, with a period P = 3.3552464 ± 0.0000071 days, transit epoch Tc = 2455216.97669 ± 0.00024 (BJD)11, and transit duration 3.653 ± 0.025 hr. The host star has a mass of 1.191 ± 0.042 M☉, radius of 1.317 ± 0.068 R☉, effective temperature 6373 ± 80 K, and a low metallicity of [Fe/H] = -0.16 ± 0.08. The planetary companion has a mass of 0.681 ± 0.031 MJ and radius of 1.243 ± 0.072 RJ yielding a mean density of 0.439 ± 0.069 g cm-3. By repeating our global fits with different parameter sets, we have performed a critical investigation of the fitting techniques used for previous Hungarian-made Automated Telescope planetary discoveries. We find that the system properties are robust against the choice of priors. The effects of fixed versus fitted limb darkening are also examined. HAT-P-24b probably maintains a small eccentricity of e = 0.052+0.022−0.017, which is accepted over the circular orbit model with false alarm probability 5.8%. In the absence of eccentricity pumping, this result suggests that HAT-P-24b experiences less tidal dissipation than Jupiter. Due to relatively rapid stellar rotation, we estimate that HAT-P-24b should exhibit one of the largest known Rossiter–McLaughlin effect amplitudes for an exoplanet (ΔVRM ≃ 95 m s−1) and thus a precise measurement of the sky-projected spin–orbit alignment should be possible.