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We present optical and infrared observations taken with the Very LargeTelescope of the eclipsing binary pulsar system PSR B1718-19. The candidatecompanion of the pulsar, identified earlier in Hubble Space Telescopeobservations, has been detected in all three bands, R, I, and J. Thesedetections allowed us to derive constraints on temperature, radius, and mass,pointing to a companion that has expanded to a radius between one of a mainsequence star and one at the Roche-limit. We focus on the role of tidalcircularisation in the system, which will have transformed the initiallyeccentric orbit expected from formation scenarios into the nearly circularorbit presently observed. Based on simple energy balance arguments, we are ableto draw a picture of the companion's evolution resulting from the energydeposition in the star due to circularisation. In this picture, our measurementof the companion's parameters is consistent with the expected initialeccentricity. However, with the present understanding of tidal dissipation itremains difficult to account for the short time in which the system wascircularised.Comment: 10 pages, 6 figures, accepted for publication in Astronomy and  Astrophysic

Observations of the companion to the pulsar PSR B1718-19