VizieR Online Data Catalog: Multiple absorption features in debris discs (Iglesias+, 2018)

In this paper, we present a sub-sample of 23 gas-rich debris disc candidates characterized by showing gas detections at different radial velocities within our database of observations prior to 2016 December. We performed observations with FEROS (Kaufer et al. 1999Msngr..95....8K) on the MPG/ESO 2.2m telescope at the La Silla Observatory in Chile and UVES (Dekker et al. 2000SPIE.4008..534D) on the VLT UT2 telescope at Paranal Observatory, Chile. We also queried the ESO archive searching for all relevant high-resolution spectra covering the blue-optical wavelength ranges. In particular data from HARPS (Mayor et al. 2003Msngr.114...20M), UVES, and FEROS instruments were searched for. We analysed the calcium H&K lines at 3968.47 and 3933.66Å and the sodium D1&D2 lines at 5895.92 and 5889.95Å, respectively. The aim is to detect narrow absorption lines superimposed on the photospheric line. These 'extra' absorption lines indicate the presence of gas in the line of sight of the star. The first step in our analysis is to measure the radial velocity of the stars. Afterwards, we determined the photospheric contribution for each line either by performing spectral synthesis or by finding a 'spectral twin' Then, we identified additional (stable or transient) components by removing the photospheric contribution before characterizing their properties.

(4 data files).