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arXiv 1003.4986astro-ph.EP
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行星系HR 8799的热红外MMTAO观测

Thermal Infrared MMTAO Observations of the HR 8799 Planetary System

Philip M. Hinz, Timothy J. Rodigas, Matthew A. Kenworthy, Suresh Sivanandam, Aren N. Heinze, Eric E. Mamajek, Michael R. Meyer

摘要:

我们目前的直接成像观测波长为3.3,3.8(L ',带),和4.8(M带)微米,行星系周围的HR 8799。这三颗行星都在L '被发现。在3.3微米处检测到c和d分量,上限来自M波段观测。这些观测为温暖的巨行星大气提供了有用的限制。我们讨论了HR 8799系统的当前年龄限制,并表明可以排除几个潜在的同生天体与恒星共同运动。并与巨行星大气模型作了比较。包括非平衡化学的模型为c和d的颜色提供了合理的匹配。根据热红外线中观察到的颜色,我们估计b的T_eff < 960 K,c和d的T_eff分别为1300和1170 K。这提供了对有效温度的独立检查,因此来自Marois 2008结果的物体质量。

英文摘要:

We present direct imaging observations at wavelengths of 3.3, 3.8 (L',band), and 4.8 (M band) microns, for the planetary system surrounding HR 8799. All three planets are detected at L'. The c and d component are detected at 3.3 microns, and upper limits are derived from the M band observations. These observations provide useful constraints on warm giant planet atmospheres. We discuss the current age constraints on the HR 8799 system, and show that several potential co-eval objects can be excluded from being co-moving with the star. Comparison of the photometry is made to models for giant planet atmospheres. Models which include non-equilibrium chemistry provide a reasonable match to the colors of c and d. From the observed colors in the thermal infrared we estimate T_eff < 960 K for b, and T_eff=1300 and 1170 K for c and d, respectively. This provides an independent check on the effective temperatures and thus masses of the objects from the Marois 2008 results.

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