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arXiv 1401.3532astro-ph.SR
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1米级望远镜的可负担光谱学

Affordable spectroscopy for 1m-class telescopes

B. Csák, J. Kovács, Gy. M. Szabó, L. L. Kiss, Á. Dózsa, Á. Sódor, I. Jankovics

备注：
7 pages, 4 figures. To be published in the proceedings of the workshop on "Observing techniques, instrumentation and science for metre-class telescopes", Sep. 2013, Tatranska Lomnica, Slovakia
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摘要：

对系外行星系统的多普勒观测一直是一种非常昂贵的技术，主要是由于高分辨率稳定摄谱仪的高成本。仪器的最新进展使人们能够用小得惊人的光学望远镜进行负担得起的多普勒行星探测。我们调查的可能性，测量多普勒反射运动的行星托管恒星的小口径望远镜，传统上被忽视的这类研究。在彻底测试了最近开发的商用Shelyak eShel中阶梯光栅摄谱仪后，我们证明了在$100 \mathrm{m\,s}^{-1}$水平上实现速度精度是常规可能的，最好的情况下可以达到$\pm 50~\mathrm{m\,s}^{-1}$。我们描述了我们的现成的仪器，包括一个新的0.5米RC望远镜在哥达天体物理天文台的罗兰Eötvös大学配备了一个中等分辨率的光纤光栅光谱仪。本文给出了一些后续的行星-恒星径向速度测量结果，并指出更新多普勒-行星轨道解是一项非常重要的任务，它可以用亚米级光学望远镜完成，而不需要在2- 4米（或更大）级望远镜上花费非常昂贵的望远镜时间。

英文摘要：

Doppler observations of exoplanet systems have been a very expensive technique, mainly due to the high costs of high-resolution stable spectrographs. Recent advances in instrumentation enable affordable Doppler planet detections with surprisingly small optical telescopes. We investigate the possibility of measuring Doppler reflex motion of planet hosting stars with small-aperture telescopes that have traditionally been neglected for this kind of studies. After thoroughly testing the recently developed and commercially available Shelyak eShel echelle spectrograph, we demonstrated that it is routinely possible to achieve velocity precision at the $100 \mathrm{m\,s}^{-1}$ level, reaching down to $\pm 50~\mathrm{m\,s}^{-1}$ for the best cases. We describe our off-the-shelf instrumentation, including a new 0.5m RC telescope at the Gothard Astrophysical Observatory of Loránd Eötvös University equipped with an intermediate resolution fiber-fed echelle spectrograph. We present some follow-up radial velocity measurements of planet hosting stars and point out that updating the orbital solution of Doppler-planets is a very important task that can be fulfilled with sub-meter sized optical telescopes without requesting very expensive telescope times on 2--4~m (or larger) class telescopes.

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