Ground-based detection of thermal emission from the exoplanet WASP-19b
Ground-based detection of thermal emission from the exoplanet WASP-19b
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系外行星 WASP-19b 热发射的地面探测
DOI：
10.1111/j.1745-3933.2010.00847.x
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Gibson N
中科院分区：
文献类型：
--
作者：
Gibson N
我们介绍了新发现的热木星系统WASP-19的掩星，用VLT上的高灵敏度宽场K波段成像仪进行观测，以测量来自行星向阳面的102 μm的热辐射。使用马尔可夫链蒙特卡罗方法分析了光变曲线，以确定日食深度和中心渡越时间。测得渡越深度为0.366 ± 0.072%，对应的亮温为2540 ± 180 K。这明显高于计算出的（零辐射）平衡温度，表明这颗行星的热量向夜面的再分配很差，与高辐射行星的模型一致。需要进一步的观察来确认逆温的存在以及可能的分子发射线。中央日食的时间被发现与圆形轨道一致。
We present an occultation of the newly discovered hot Jupiter system WASP-19, observed with the High Acuity Wide-fieldK-band Imager instrument on the VLT, in order to measure thermal emission from the planet's dayside at ∼2μm. The light curve was analysed using a Markov Chain Monte Carlo method to find the eclipse depth and the central transit time. The transit depth was found to be 0.366 ± 0.072 per cent, corresponding to a brightness temperature of 2540 ± 180 K. This is significantly higher than the calculated (zero-albedo) equilibrium temperature and indicates that the planet shows poor redistribution of heat to the night side, consistent with models of highly irradiated planets. Further observations are needed to confirm the existence of a temperature inversion and possibly molecular emission lines. The central eclipse time was found to be consistent with a circular orbit.