Abstract
We describe a flexible data reduction package for high resolution cross-dispersed echelle data. This open-source package is developed in Python and includes optional GUIs for most of the steps. It does not require any pre-knowledge about the form or position of the echelle-orders. It has been tested on cross-dispersed echelle spectrographs between 13k and 115k resolution (bifurcated fiber-fed spectrogaph ESO-HARPS and single fiber-fed spectrograph TNT-MRES). HiFLEx can be used to determine radial velocities and is designed to use the TERRA package but can also control the radial velocity packages such as CERES and SERVAL to perform the radial velocity analysis. Tests on HARPS data indicates radial velocities results within ±3 m s−1 of the literature pipelines without any fine tuning of extraction parameters.
Highlights
High resolution echelle spectrographs are a highly important tool to study astrophysical phenomena like the study of stellar atmospheres (e.g., Ryde et al 2019) or the search for and characterization of extrasolar planets around nearby stars (e.g., Anglada-Escudé et al 2016; Lovis et al 2017)
High resolution is reached by using an echelle grating, which is optimized for reflection in high orders, as higher orders have higher dispersion
The pipeline works for echelle spectrographs with either single fiber or bifurcated fiber input if at least two distinguishable echelle orders are imaged onto the detector
Summary
High resolution echelle spectrographs are a highly important tool to study astrophysical phenomena like the study of stellar atmospheres (e.g., Ryde et al 2019) or the search for and characterization of extrasolar planets around nearby stars (e.g., Anglada-Escudé et al 2016; Lovis et al 2017). For each instrument the pipeline requires a bespoke script with several hundred lines of code and prepared configuration files with the positions of the orders and the wavelength solution This makes for quite a lot of extra steps to apply it to data from spectrographs not included. Developed a flexible data reduction package, in which a single calibration file has to be edited while no modification in the program code are required to reduce data from a modified setup This flexible package allows the reduction from data of a wide range of echelle spectrographs. After the extraction and calibration of the spectrum, precise radial velocities can be measured using available packages: TERRA (Anglada-Escudé & Paul Butler 2012), SERVAL5 (Zechmeister et al 2018), and CERES pipeline.. Increase precision of the barycentric corrections can be done with packages like PEXO (Feng et al 2019)
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