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arXiv 0708.0822astro-ph
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来自过境甚热彗星的热辐射:光学波长地基探测的前景

Thermal Emission from Transiting Very-Hot Jupiters: Prospects for Ground-based Detection at Optical Wavelengths

Mercedes Lopez-Morales, Sara Seager

摘要:

极热彗星(VHJ)是指轨道周期短于三天的太阳系外行星。在低辐照度下,VHJ的有效辐照温度可达2500-3000 K。因此,来自VHJ的热发射在光学波长处可能很强。我们探讨了利用现有的地面望远镜探测二次日食期间光学波长热辐射的前景。我们发现OGLE-TR-56 b和OGLE-TR-132 b是最适合检测的候选者,并且在z '波段(~0.9微米)附近的前景最高。我们还推测,任何新发现的VHJ的轨道分离和宿主恒星参数的正确组合可以在光学热检测。缺乏探测仍然会限制行星的反辐射和再辐射因素。

英文摘要:

Very hot Jupiters (VHJs) are defined as Jupiter-mass extrasolar planets with orbital periods shorter than three days. For low albedos the effective temperatures of irradiated VHJs can reach 2500-3000 K. Thermal emission from VHJs is therefore potentially strong at optical wavelengths. We explore the prospects of detecting optical-wavelength thermal emission during secondary eclipse with existing ground-based telescopes. We show that OGLE-TR-56b and OGLE-TR-132b are the best suited candidates for detection, and that the prospects are highest around z'-band (~0.9 microns). We also speculate that any newly discovered VHJs with the right combination of orbital separation and host star parameters could be thermally detected in the optical. The lack of detections would still provide constraints on the planetary albedos and re-radiation factors.

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