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arXiv 1003.2211astro-ph.EP
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HAT-P-14 b:一颗质量为2.2亿亿欧的系外行星,正经过一颗明亮的F星

HAT-P-14b: A 2.2 Jupiter-mass exoplanet transiting a bright F star

G. Torres, G. A. Bakos, J. Hartman, Geza Kovacs, R. W. Noyes, D. W. Latham, D. A. Fischer, J. A. Johnson, G. W. Marcy, A. W. Howard, D. D. Sasselov, D. Kipping,… 展开作者

G. Torres, G. A. Bakos, J. Hartman, Geza Kovacs, R. W. Noyes, D. W. Latham, D. A. Fischer, J. A. Johnson, G. W. Marcy, A. W. Howard, D. D. Sasselov, D. Kipping, B. Sipocz, R. P. Stefanik, G. A. Esquerdo, M. E. Everett, J. Lazar, I. Papp, P. Sari

摘要:

我们报告发现了HAT-P-14 b,这是一颗相当大的凌日系外行星,围绕中等亮度的恒星GSC 3086-00152(V = 9.98)运行,周期为P = 4.627669 +/- 0.000005天。凌日接近于放牧(碰撞参量0.891 + 0.007/-0.008),持续时间为0.0912 +/- 0.0017天,凌日中期的参考历元为Tc = 2454875.28938 +/- 0.00047(BJD)。轨道稍微偏心(e = 0.107 +/- 0.013),并且方位是这样的,不太可能发生掩星。主星是一颗稍微演化的中F矮星,质量为1.386 +/- 0.045 M(太阳),半径为1.468 +/- 0.054 R(太阳),有效温度为6600 +/- 90 K,成分稍微富金属,相当于[Fe/H] = +0.11 +/- 0.08。这颗行星的质量为2.232 +/- 0.059 M(Jup),半径为1.150 +/- 0.052 R(Jup),意味着平均密度为1.82 +/- 0.24 g/cm 3。如果行星的重元素含量约为50 M(地球)(占其总质量的7%),那么它的半径可以很好地被理论模型再现为系统的1.3 Gyr年龄。HAT-P-14的亮度、近掠射方向和其他特性使其成为一个有利的凌日系统,可以寻找可能的第二颗行星引起的轨道要素变化或凌日时间变化,并通过监测凌日持续时间变化来对地球质量以下或地球质量外卫星的存在进行有意义的限制。

英文摘要:

We report the discovery of HAT-P-14b, a fairly massive transiting extrasolar planet orbiting the moderately bright star GSC 3086-00152 (V = 9.98), with a period of P = 4.627669 +/- 0.000005 days. The transit is close to grazing (impact parameter 0.891 +0.007/-0.008) and has a duration of 0.0912 +/- 0.0017 days, with a reference epoch of mid transit of Tc = 2454875.28938 +/- 0.00047 (BJD). The orbit is slightly eccentric (e = 0.107 +/- 0.013), and the orientation is such that occultations are unlikely to occur. The host star is a slightly evolved mid-F dwarf with a mass of 1.386 +/- 0.045 M(Sun), a radius of 1.468 +/- 0.054 R(Sun) effective temperature 6600 +/- 90 K, and a slightly metal-rich composition corresponding to [Fe/H] = +0.11 +/- 0.08. The planet has a mass of 2.232 +/- 0.059 M(Jup) and a radius of 1.150 +/- 0.052 R(Jup), implying a mean density of 1.82 +/- 0.24 g/cm3. Its radius is well reproduced by theoretical models for the 1.3 Gyr age of the system if the planet has a heavy-element fraction of about 50 M(Earth) (7% of its total mass). The brightness, near-grazing orientation, and other properties of HAT-P-14 make it a favorable transiting system to look for changes in the orbital elements or transit timing variations induced by a possible second planet, and also to place meaningful constraints on the presence of sub-Earth mass or Earth mass exomoons, by monitoring it for transit duration variations.

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