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arXiv 0901.1878astro-ph.EP
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对系外行星TrES-3b热辐射的地基K波段探测

Ground-based K-band detection of thermal emission from the exoplanet TrES-3b

E. J. W. de Mooij, I. A. G. Snellen

摘要:

内容:斯皮策太空望远镜对凌日系外行星的二次日食测量已经产生了几个直接探测到的热系外行星光。由于斯皮策在波长longward的3.6微米,可以说是行星光谱(从1到3微米)的最有趣的部分之一是无法与这颗卫星。这个区域是行星光谱能量分布的峰值,也是分子吸收带可以显著影响测量的发射的区域。目标:到目前为止,2.2微米K波段二次日食测量,这是可能的,从地面上,尚未导致安全的检测。本文的目的是在K波段测量非常热的木星TrES-3b的二次日食,并观测其凌日,以获得精确的行星半径在近红外。研究方法:我们使用威廉赫歇尔望远镜(WHT)观测二次日食,并使用英国红外望远镜(UKIRT)观测TrES-3b的凌日。这两次观测都涉及望远镜的显著散焦,目的是以高效率产生数千帧的高节奏时间序列,星光分散在许多像素上。结果:我们检测到TrES-3b的二次蚀,深度为-0.241+-0.043%(~6 sigma)。这对应于T_B(2.2 μ m)= 2040+-185K的昼侧亮温,这与目前该行星高层大气物理性质的模型相一致。日食的中心似乎从相位φ =0.5稍微偏移了Delta_phi=-0.0042+-0.0027,这可能表明TrES-3b的轨道是非圆形的。

英文摘要:

Context: Secondary eclipse measurements of transiting extrasolar planets with the Spitzer Space Telescope have yielded several direct detections of thermal exoplanet light. Since Spitzer operates at wavelengths longward of 3.6 um, arguably one of the most interesting parts of the planet spectrum (from 1 to 3 um) is inaccessible with this satellite. This region is at the peak of the planet's spectral energy distribution and is also the regime where molecular absorption bands can significantly influence the measured emission. Aims: So far, 2.2 um K-band secondary eclipse measurements, which are possible from the ground, have not yet lead to secure detections. The aim of this paper is to measure the secondary eclipse of the very hot Jupiter TrES-3b in K-band, and in addition to observe its transit, to obtain an accurate planet radius in the near infrared. Methods: We have used the William Herschell Telescope (WHT) to observe the secondary eclipse, and the United Kingdom Infrared Telescope (UKIRT) to observe the transit of TrES-3b. Both observations involved significant defocusing of the telescope, aimed to produce high-cadence time series of several thousand frames at high efficiency, with the starlight spread out over many pixels. Results: We detect the secondary eclipse of TrES-3b with a depth of -0.241+-0.043% (~6 sigma). This corresponds to a day-side brightness temperature of T_B(2.2um)= 2040+-185 K, which is consistent with current models of the physical properties of this planet's upper atmosphere. The centre of the eclipse seems slightly offset from phase phi=0.5 by Delta_phi=-0.0042+-0.0027, which could indicate that the orbit of TrES-3b is non-circular [abridged].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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