RIDOLFI, ALESSANDROALESSANDRORIDOLFIFreire, P. C. C.P. C. C.FreireTorne, P.P.TorneHeinke, C. O.C. O.Heinkevan den Berg, M.M.van den BergJordan, C.C.JordanKramer, M.M.KramerBassa, C. G.C. G.BassaSarkissian, J.J.SarkissianD'Amico, N.N.D'AmicoLorimer, D.D.LorimerCamilo, F.F.CamiloManchester, R. N.R. N.ManchesterLyne, A.A.Lyne2022-07-182022-07-1820160035-8711http://hdl.handle.net/20.500.12386/32519For the past couple of decades, the Parkes radio telescope has been regularly observing the millisecond pulsars in 47 Tucanae (47 Tuc). This long-term timing programme was designed to address a wide range of scientific issues related to these pulsars and the globular cluster where they are located. In this paper, the first of a series, we address one of these objectives: the characterization of four previously known binary pulsars for which no precise orbital parameters were known, namely 47 Tuc P, V, W and X (pulsars 47 Tuc R and Y are discussed elsewhere). We determined the previously unknown orbital parameters of 47 Tuc V and X and greatly improved those of 47 Tuc P and W. For pulsars W and X we obtained, for the first time, full coherent timing solutions across the whole data span, which allowed a much more detailed characterization of these systems. 47 Tuc W, a well-known tight eclipsing binary pulsar, exhibits a large orbital period variability, as expected for a system of its class. 47 Tuc X turns out to be in a wide, extremely circular, 10.9-d long binary orbit and its position is ∼3.8 arcmin away from the cluster centre, more than three times the distance of any other pulsar in 47 Tuc. These characteristics make 47 Tuc X a very different object with respect to the other pulsars of the cluster.STAMPAenArticle10.1093/mnras/stw1850https://academic.oup.com/mnras/article/462/3/2918/25898702016MNRAS.462.2918RFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation