A&A 603, A74 (2017) Astronomy DOI: 10.1051/0004-6361/201527494 & c ESO 2017 Astrophysics Multi-epoch observations with high spatial resolution of multiple T Tauri systems Gergely Csépány1; 2, Mario van den Ancker1, Péter Ábrahám2, Rainer Köhler4; 5, Wolfgang Brandner3, Felix Hormuth3, and Hector Hiss3 1 European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany 2 Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, 1121 Budapest, Konkoly Thege Miklós út 15-17, Hungary e-mail:
[email protected] 3 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany 4 Institut für Astro- und Teilchenphysik, Universität Innsbruck, Technikerstr. 25/8, 6020 Innsbruck, Austria 5 University of Vienna, Department of Astrophysics, Türkenschanzstr. 17 (Sternwarte), 1180 Vienna, Austria Received 2 October 2015 / Accepted 27 February 2017 ABSTRACT Context. In multiple pre-main-sequence systems the lifetime of circumstellar discs appears to be shorter than around single stars, and the actual dissipation process may depend on the binary parameters of the systems. Aims. We report high spatial resolution observations of multiple T Tauri systems at optical and infrared wavelengths. We determine whether the components are gravitationally bound and orbital motion is visible, derive orbital parameters, and investigate possible correlations between the binary parameters and disc states. Methods. We selected 18 T Tau multiple systems (16 binary and two triple systems, yielding 16 + 2 × 2 = 20 binary pairs) in the Taurus-Auriga star-forming region from a previous survey, with spectral types from K1 to M5 and separations from 0:2200 (31 AU) to 5:800 (814 AU).