行星HD 209458 b的理论光谱模型
Theoretical Spectral Models of the Planet HD 209458b with a Thermal Inversion and Water Emission Bands
摘要：
我们发现，理论上适合所有的HD 209458b的数据在二次日食需要HD 209458b的昼侧大气有一个热逆温和平流层。这种反转是由位于高空的不明来源的吸收体捕获恒星光通量引起的。平流层加热和逆温的一个后果是水吸收特征从近红外到中红外的发射特征的翻转，我们在Knutson等人最近的HD 209458b IRAC数据中看到了这种水发射特征的证据。高层大气的光学吸收体可能有助于解释在传输中看到的预期Na D特征以及24 $μ$ m处的传输半径小于光学中的相应半径的事实。此外，这可能是HD 209458 b的光学通过半径如此之大的原因之一。我们推测这种吸收剂的性质和行星的大气层可能会，也可能不会，受到它的存在。
英文摘要：
We find that a theoretical fit to all the HD 209458b data at secondary eclipse requires that the dayside atmosphere of HD 209458b have a thermal inversion and a stratosphere. This inversion is caused by the capture of optical stellar flux by an absorber of uncertain origin that resides at altitude. One consequence of stratospheric heating and temperature inversion is the flipping of water absorption features into emission features from the near- to the mid-infrared and we see evidence of such a water emission feature in the recent HD 209458b IRAC data of Knutson et al. In addition, an upper-atmosphere optical absorber may help explain both the weaker-than-expected Na D feature seen in transit and the fact that the transit radius at 24 $μ$m is smaller than the corresponding radius in the optical. Moreover, it may be a factor in why HD 209458b's optical transit radius is as large as it is. We speculate on the nature of this absorber and the planets whose atmospheres may, or may not, be affected by its presence.
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。
