Multi-epoch, high spatial resolution observations of multiple T Tauri systems
Gergely Cs\'ep\'any (1, 2), Mario van den Ancker (1), P\'eter, \'Abrah\'am (2), Rainer K\"ohler (4, 5), Wolfgang Brandner (3), Felix, Hormuth (3), Hector Hiss (3) ((1) ESO Garching, (2) Konkoly Observatory, (3), MPIA, (4) University of Innsbruck, Institute for Astro-

TL;DR
This study uses high-resolution optical and infrared observations to analyze the orbital motion and disk properties of multiple T Tauri star systems, finding orbital motion in some and no strong correlation between binary parameters and disk emission.
Contribution
It provides new high-resolution observational data on multiple T Tauri systems, revealing orbital motion and disk characteristics over a 20-year timescale, with no clear link between binary parameters and disk emission.
Findings
Detected orbital motion in several T Tauri systems.
No significant correlation between binary parameters and disk infrared excess.
Disk emission levels are similar to those in single stars.
Abstract
Context. In multiple pre-main-sequence systems the lifetime of circumstellar disks 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 if the components are gravitationally bound and orbital motion is visible, derive orbital parameters and investigate possible correlations between the binary parameters and disk states. Methods. We selected 18 T Tau multiple systems (16 binary and two triple systems, yielding binary pairs) in the Taurus-Auriga star forming region from the survey by Leinert et al. (1993), with spectral types from K1 to M5 and separations from 0.22" (31 AU) to 5.8" (814 AU). We analysed data acquired in 2006-07 at Calar Alto using the AstraLux…
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