光透射谱中探测到的HD189733b的行星际大气钠吸收
Sodium Absorption From the Exoplanetary Atmosphere of HD189733b Detected in the Optical Transmission Spectrum
摘要：
我们提出了第一个基于地面的探测太阳系外行星的透射光谱中的钠吸收。由于太阳系外行星HD 189733 b的大气层吸收，在NaI双重线的两条线中都被检测到。利用9.2米霍比-埃伯利望远镜（HET）上的高分辨率摄谱仪（HRS）对11次凌日进行了高光谱分辨率观测。由于HD 189733 b的存在，透射光谱中的NaI吸收在“窄”光谱带中比相邻光谱带深（-67.2 +/- 20.7）x 10^-5，该“窄”光谱带包括两条谱线。1-sigma误差包括随机误差和系统误差两者，并且检测>3-sigma。在NaI中，HD 189733 b的相对吸收量比Charbonneau等人（2002年）在HD209458 b中检测到的大约3倍，表明这两种热中子可能具有显著不同的大气特性。
英文摘要：
We present the first ground-based detection of sodium absorption in the transmission spectrum of an extrasolar planet. Absorption due to the atmosphere of the extrasolar planet HD189733b is detected in both lines of the NaI doublet. High spectral resolution observations were taken of eleven transits with the High Resolution Spectrograph (HRS) on the 9.2 meter Hobby-Eberly Telescope (HET). The NaI absorption in the transmission spectrum due to HD189733b is (-67.2 +/- 20.7) x 10^-5 deeper in the ``narrow'' spectral band that encompasses both lines relative to adjacent bands. The 1-sigma error includes both random and systematic errors, and the detection is >3-sigma. This amount of relative absorption in NaI for HD189733b is ~3x larger than detected for HD209458b by Charbonneau et al. (2002), and indicates these two hot-Jupiters may have significantly different atmospheric properties.
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。
