H -band thermal emission from the 19-h period planet WASP-19b
H -band thermal emission from the 19-h period planet WASP-19b
复制标题
19 小时周期行星 WASP-19b 的 H 波段热辐射
DOI：
10.1051/0004-6361/201014226
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发表时间：
2010
影响因子：
6.5
通讯作者：
Anderson D
中科院分区：
文献类型：
--
作者：
Anderson D
我们首次对 H 波段系外行星的热发射进行地面探测。使用 VLT 上的 HAWK-I，我们观察到 WASP-19b 被其 G8V 型主星掩星。 WASP-19b 是一颗木星质量的行星，轨道周期仅为 19 小时，因此受到高度辐射，预计温度很高。我们测量到的 H 波段掩星深度为 (0.259 +0.046 -0.044) %，对应于 H 波段亮度温度 T_H = 2580 +/- 125 K。行星大气层的无云模型，没有从白天到夜晚的能量重新分配，将行星/恒星通量密度比预测为两倍。由于恒星参数以及行星辐射水平受到测量的严格限制，因此我们的行星大气模型可能过于简单。
We present the first ground-based detection of thermal emission from an exoplanet in the H-band. Using HAWK-I on the VLT, we observed an occultation of WASP-19b by its G8V-type host star. WASP-19b is a Jupiter-mass planet with an orbital period of only 19 h, and thus, being highly irradiated, is expected to be hot. We measure an H-band occultation depth of (0.259 +0.046 -0.044) %, which corresponds to an H-band brightness temperature of T_H = 2580 +/- 125 K. A cloud-free model of the planet's atmosphere, with no redistribution of energy from day-side to night-side, under predicts the planet/star flux density ratio by a factor of two. As the stellar parameters, and thus the level of planetary irradiation, are well-constrained by measurement, it is likely that our model of the planet's atmosphere is too simple.