HiFLEx -- a highly flexible package to reduce cross-dispersed echelle spectra

TL;DR

HiFLEx is an open-source, Python-based data reduction package for high-resolution cross-dispersed echelle spectra, offering flexibility, GUIs, and accurate radial velocity measurements without prior order knowledge.

Contribution

It introduces a highly flexible, user-friendly package that simplifies echelle data reduction and achieves precise radial velocities across various spectrographs.

Findings

Achieves radial velocity accuracy within 3 m/s of literature pipelines.

Compatible with multiple spectrographs and radial velocity packages.

Does not require prior knowledge of echelle order positions.

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 3m/s of the literature pipelines without any fine tuning of extraction parameters.