The Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES) Data Reduction Pipeline

arXiv:2607.29570 · astro-ph.IM, astro-ph.EP, astro-ph.SR · Submitted 2026-07-31 · Read on arXiv

Sandipan P. D. Borthakur, Tõnis Eenmäe, Nikolai Piskunov, Luca Fossati, Mihkel Kama, Thomas Marquart, Anni Kasikov, Heleri Ramler, Anna Aret, Christiane Helling, Laurits Leedjärv, Linn Boldt-Christmas

Graz University of Technology, Austria · Tartu Observatory, Estonia · Uppsala University, Sweden · Space Research Institute, Austria · Tartu Observatory, Estonia · Uppsala University, Sweden · European Southern Observatory, Chile · Tartu Observatory, Estonia · Tartu Observatory, Estonia · Space Research Institute, Austria · Tartu Observatory, Estonia · Uppsala University, Sweden

astro-ph.IM, astro-ph.EP, astro-ph.SR

Submitted: 2026-07-31

Comments: Accepted for publication in the Publication of the Astronomical Society of the Pacific (PASP) journal, 27 pages (6 pages in References and Appendices), 18 figures, 1 Table in Appendix B

Code: https://github.com/Sandipan-Borthakur/spectroscopy-toolbox

License: http://creativecommons.org/licenses/by/4.0/

The gist: We introduce the data reduction pipeline for the Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES).

Terminology

Calibration — 22× in this paper · explained in 7 episodes
Trace — 15× in this paper · explained in 2 episodes
Tartu Observatory Fiber-fed Echelle Spectrograph — 7× in this paper
Abundance — 5× in this paper · explained in 1 episode
Alignment — 2× in this paper · explained in 1 episode
Aperture — 2× in this paper · explained in 1 episode
Clustering — 2× in this paper · explained in 2 episodes
Core — 1× in this paper · explained in 2 episodes
Fine-Tuning — 1× in this paper · explained in 5 episodes
Transiting Exoplanet Survey Satellite — 1× in this paper
Verification — 1× in this paper · explained in 2 episodes

Abstract

We introduce the data reduction pipeline for the Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES). TOFES is installed in the Coud'e room and will be connected to the 1.5 m Tartu Observatory AZT-12 telescope through a four-channel instrument adapter to be mounted at the Cassegrain focus of the telescope. The spectrograph has an average spectral resolution of 30,000 and covers the 390 to 900 nm wavelength band in a single exposure. The data reduction pipeline, based on the PyReduce package, was tested on spectra of the Sun. We also present the Spectroscopy-Toolbox package, which was developed to provide additional tools for diagnostics and spectral line identification for radial velocity measurements. The spectrograph will address a range of scientific questions, including the stellar characterisation of Herbig AeBe stars to measure accretion contamination from their protoplanetary disks, the stellar characterisation of exoplanet host-stars including the Ariel space mission targets, and radial velocity monitoring of large-scale atmospheric variability in massive stars.

Terminology

Abstract

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