tokens: This research has made use of data and/or software provided by the High Energy Astrophysics Science Archive Research Center (HEASARC), which is a service of the Astrophysics Science Division at NASA/GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. The High-Energy Astrophysics Group of Palermo acknowledges support from the Fondo Finalizzato alla Ricerca (FFR) 2012/13, project No. 2012-ATE-0390. We also acknowledge a financial contribution from the agreement ASI-INAF I/037/12/0. M.D.S. thanks the Dipartimento di Fisica e Chimica, Università di Palermo, for its hospitality. A.R. and A.S. gratefully acknowledge the Sardinia Regional Government for its financial support (P.O.R. Sardegna F.S.E. Operational Programme of the Autonomous Region of Sardinia, European Social Fund 2007-2013 – Axis IV Human Resources, Objective l.3, Line of Activity l.3.1.). A.P. acknowledges grant SGR2014-1073 and partial support from “NewCompStar”, COST Action MP1304. A.P. acknowledges support via an EU Marie Skłodowska-Curie fellowship under grant No. 660657-TMSP-H2020-MSCA-IF-2014, as well as fruitful discussion with the international team on “The diskmagnetosphere interaction around transitional millisecond pulsars” at ISSI (International Space Science Institute), Bern.
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