The EREBOS project - Studying the influence of substellar objects on late stellar evolution

The EREBOS (Eclipsing Reflection Effect Binaries from the OGLE Survey) project is an ESO Large Programme (196.D-0214) using FORS2 in long-slit mode. The sample includes several post-common envelope eclipsing binaries with a hot subdwarf primary and a cool, low-mass companion using time-resolved spectroscopy to derive their radial velocity curve and the atmospheric parameters. The goal of this project is to study the interactions of low-mass stellar and sub-stellar companions with low-mass stars. All targets were selected photometrically from the Optical Gravitational Lensing Experiment (OGLE) survey as eclipsing binaries showing a prominent reflection effect and short orbital periods around 0.1 d. We observed all targets with grism GRIS_1200B+97, which covers a wavelength range from 366-511 nm. We always used a 1’’ slit, which results in a resolution R = 1420. In this data release 1 we publish a target catalogue with the coordinates, magnitudes and orbital periods derived from the OGLE survey together with the reduced 1D spectra. Additionally, also the reduced 2D spectra and finding charts of each target are attached as auxiliary files. A catalogue of all individual spectra including the epochs of the observations in HJD and the corresponding orbital phases is released as well.