Exoplanet spectroscopy and photometry with the Twinkle space telescope
Exoplanet spectroscopy and photometry with the Twinkle space telescope
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DOI：
10.1007/s10686-018-9611-4
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发表时间：
2019-04-01
影响因子：
3
通讯作者：
Sarkar, Subhajit
中科院分区：
文献类型：
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作者：
Edwards, Billy;Rice, Malena;Sarkar, Subhajit
闪烁太空望远镜是为描述系外行星和太阳系天体而设计的。Twinkle在近地太阳同步轨道上运行，配备了一个45厘米的望远镜以及可同时运行的可见光(0.4-1米)和红外(1.3-4.5米)光谱仪。Tinkle是一个普通观测站，它将按需提供对波长范围内的各种目标的观测，这些目标目前无法使用其他空间望远镜访问，或在短期内只有超额订阅的观测站才能访问。在这里，我们将探索Twinkle的光谱仪描述目前已知的系外行星的能力。我们研究了通过组合不同行星和恒星类型的多个观测所能达到的光谱分辨率。我们还模拟了一些著名行星(HD 209458 b、GJ 3470 b和55 Cnc e)的光谱反演。从已知的系外行星中，我们发现，在一次凌日或日食的情况下，Twinkle可以探测到1通道(1.3-4.5米)中89颗低光谱分辨率(R<；20)的行星和12颗高分辨率(R>；20)的行星。通过10次观测，144颗行星的大气层可以用R来表征
The Twinkle space telescope has been designed for the characterisation of exoplanets and Solar System objects. Operating in a low Earth, Sun-synchronous orbit, Twinkle is equipped with a 45 cm telescope and visible (0.4 - 1 m) and infrared (1.3 - 4.5 m) spectrometers which can be operated simultaneously. Twinkle is a general observatory which will provide on-demand observations of a wide variety of targets within wavelength ranges that are currently not accessible using other space telescopes or accessible only to oversubscribed observatories in the short-term future. Here we explore the ability of Twinkle's spectrometers to characterise the currently-known exoplanets. We study the spectral resolution achievable by combining multiple observations for various planetary and stellar types. We also simulate spectral retrievals for some well-known planets (HD 209458 b, GJ 3470 b and 55 Cnc e). From the exoplanets known today, we find that with a single transit or eclipse, Twinkle could probe 89 planets at low spectral resolution (R < 20) as well as 12 planets at higher resolution (R > 20) in channel 1 (1.3 - 4.5 m). With 10 observations, the atmospheres of 144 planets could be characterised with R