用VSI对热超导体进行近红外表征的前景
Prospects for near-infrared characterisation of hot Jupiters with VSI
摘要：
本文研究了利用第二代VLTI光谱成像仪（VSI）获取太阳系外明亮行星近红外光谱的可行性，该仪器具有分辨附近热太阳系外巨行星（EGP）与其主星所需的角分辨率。考虑到基本噪声，我们模拟关闭相位测量的几个太阳系外的系统，使用4个8米望远镜在VLT和低光谱分辨率（R = 100）。T. Barman被用作输入。然后使用标准的卡方拟合方法从模拟数据中重建行星光谱。这些模拟表明，在H和K波段的低分辨率光谱，可以恢复一个良好的保真度为六个目标在一个合理的观测时间（约10小时，分散在几个晚上）。这种观测将强烈地限制行星的温度和温度，能量再分配机制，以及它们大气的化学成分。系统误差，不包括在我们的模拟，可能是一个严重的限制，这些性能的估计。然而，集成光学的使用有望提供所需的仪器稳定性（在闭合相位时约为10^-4），从而能够在近红外波段首次全面表征太阳系外行星的发射光谱。
英文摘要：
In this paper, we study the feasibility of obtaining near-infrared spectra of bright extrasolar planets with the 2nd generation VLTI Spectro-Imager instrument (VSI), which has the required angular resolution to resolve nearby hot Extrasolar Giant Planets (EGPs) from their host stars. Taking into account fundamental noises, we simulate closure phase measurements of several extrasolar systems using four 8-m telescopes at the VLT and a low spectral resolution (R = 100). Synthetic planetary spectra from T. Barman are used as an input. Standard chi2-fitting methods are then used to reconstruct planetary spectra from the simulated data. These simulations show that low-resolution spectra in the H and K bands can be retrieved with a good fidelity for half a dozen targets in a reasonable observing time (about 10 hours, spread over a few nights). Such observations would strongly constrain the planetary temperature and albedo, the energy redistribution mechanisms, as well as the chemical composition of their atmospheres. Systematic errors, not included in our simulations, could be a serious limitation to these performance estimations. The use of integrated optics is however expected to provide the required instrumental stability (around 10^-4 on the closure phase) to enable the first thorough characterisation of extrasolar planetary emission spectra in the near-infrared.
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