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arXiv 0909.5221astro-ph.EP
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系外行星TrES-3的宽带红外发射光谱

The Broadband Infrared Emission Spectrum of the Exoplanet TrES-3

Francois Fressin, Heather A. Knutson, David Charbonneau, Francis T. O'Donovan, Adam Burrows, Drake Deming, Georgi Mandushev, David Spiegel

摘要:

我们使用斯皮策太空望远镜来估计太阳系外行星TrES-3的昼侧热辐射,该热辐射集成在红外阵列相机(IRAC)仪器的3.6,4.5,5.8和8.0微米带通中。我们观测到两次日食,并在4个IRAC带通中分别发现相对日食深度为0.00346 +/-0.00035,0.00372 +/- 0.00054,0.00449 +/- 0.00097和0.00475 +/- 0.00046。我们将我们的结果与De Mooij等人(2009)早期的K波段测量相结合,并将其与行星排放模型进行比较。我们发现这颗行星不需要在高层大气中存在逆温层。这是第一颗没有逆温现象的非常强烈照射的行星,这表明温度以外的恒星或行星特性对逆温有重要影响。De Mooij & Snellen(2009)也侦测到K波段的二次日食可能有轻微的时间偏移。然而,基于我们的4个斯皮策通道,我们将3sigma上限设置为|ecos(w)|< 0.0056其中e是行星的轨道偏心率,w是近星点的经度。这一结果有力地表明,轨道是圆形的,正如潮汐循环理论所预期的那样。

英文摘要:

We use the Spitzer Space Telescope to estimate the dayside thermal emission of the exoplanet TrES-3 integrated in the 3.6, 4.5, 5.8, and 8.0 micron bandpasses of the Infrared Array Camera (IRAC) instrument. We observe two secondary eclipses and find relative eclipse depths of 0.00346 +/- 0.00035, 0.00372 +/- 0.00054, 0.00449 +/- 0.00097, and 0.00475 +/- 0.00046, respectively in the 4 IRAC bandpasses. We combine our results with the earlier K band measurement of De Mooij et al. (2009), and compare them with models of the planetary emission. We find that the planet does not require the presence of an inversion layer in the high atmosphere. This is the first very strongly irradiated planet that does not have a temperature inversion, which indicates that stellar or planetary characteristics other than temperature have an important impact on temperature inversion. De Mooij & Snellen (2009) also detected a possible slight offset in the timing of the secondary eclipse in K band. However, based on our 4 Spitzer channels, we place a 3sigma upper limit of |ecos(w)| < 0.0056 where e is the planets orbital eccentricity and w is the longitude of the periastron. This result strongly indicates that the orbit is circular, as expected from tidal circularization theory.

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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