论文标题
系外星透射光谱影像仪（ETSI）
The Exoplanet Transmission Spectroscopy Imager (ETSI)
论文作者
论文摘要
我们介绍了一种新型仪器的设计，该仪器调整了用于检测过境外球星的气氛。该仪器称为系外行星传输光谱成像仪（ETSI），它使用了一种称为Comman-Path Multi-Band Imaging（CMI）的新技术。 ETSI使用棱镜和多波段滤波器在两个检测器上同时在$ 430-975nm $上拍摄15个光谱带通（在明亮恒星的外部transits期间，$ 430-975NM $（平均光谱分辨率为$ r =λ/δλ= 23 $）。该仪器的原型达到了光子噪声有限的结果，该结果低于大气振幅闪烁噪声极限。 ETSI可以在适度的望远镜上在相对较短的时间内检测外部球星大气的存在和组成。我们显示了乐器的光学设计。此外，我们讨论了由ETSI仪器的科学驱动的棱镜和多波段过滤器的设计交易。我们描述了即将进行的ETSI调查，该调查将在两米望远镜上以$ \ sim2 $年的价格测量数十个系外行星的大气光谱。最后，我们将讨论ETSI将如何成为对所有燃气巨型系外行星进行跟进的强大手段，这些系外行星将透明明亮的恒星，包括许多最近确定的苔丝（NASA的过境外部系外行星调查卫星）系外行星。
We present the design of a novel instrument tuned to detect transiting exoplanet atmospheres. The instrument, which we call the exoplanet transmission spectroscopy imager (ETSI), makes use of a new technique called common-path multi-band imaging (CMI). ETSI uses a prism and multi-band filter to simultaneously image 15 spectral bandpasses on two detectors from $430-975nm$ (with a average spectral resolution of $R = λ/Δλ= 23$) during exoplanet transits of a bright star. A prototype of the instrument achieved photon-noise limited results which were below the atmospheric amplitude scintillation noise limit. ETSI can detect the presence and composition of an exoplanet atmosphere in a relatively short time on a modest-size telescope. We show the optical design of the instrument. Further, we discuss design trades of the prism and multi-band filter which are driven by the science of the ETSI instrument. We describe the upcoming survey with ETSI that will measure dozens of exoplanet atmosphere spectra in $\sim2$ years on a two meter telescope. Finally, we will discuss how ETSI will be a powerful means for follow up on all gas giant exoplanets that transit bright stars, including a multitude of recently identified TESS (NASA's Transiting Exoplanet Survey Satellite) exoplanets.
