Multi-epoch, high spatial resolution observations of multiple T Tauri systems

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 $16+2\times 2=20$ 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 lucky imaging system, along with data from SPHERE and NACO at the VLT, and from the literature. Results. We found ten pairs to orbit each other, five pairs that may show orbital motion and five likely common proper motion pairs. We found no obvious correlation between the stellar parameters and binary configuration. The 10 $\mu$m infra-red excess varies between 0.1 and 7.2 magnitudes (similar to the distribution in single stars, where it is between 1.7 and 9.1), implying that the presence of the binary star does not greatly influence the emission from the inner disk. Conclusions. We have detected orbital motion in young T Tauri systems over a timescale of $\approx 20$ years. Further observations with even longer temporal baseline will provide crucial information on the dynamics of these young stellar systems.

Accepted by A&A

References in corpus (22)

• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• Stellar Multiplicity and the IMF: Most Stars Are Single
• On the Diversity of the Taurus Transitional Disks: UX Tau A & Lk Ca 15
• VLBA determination of the distance to nearby star-forming regions I. The distance to T Tauri with 0.4% accuracy
• Results of the ROTOR-program. II. The long-term photometric variability of weak-line T Tauri stars
• A VLT/NACO Survey for Triple and Quadruple Systems among Visual Pre-Main Sequence Binaries
• Binarity as a key factor in protoplanetary disk evolution: Spitzer disk census of the eta Chamaeleontis cluster
• The Evolution of the Multiplicity of Embedded Protostars I: Sample Properties and Binary Detections
• A Survey for New Members of the Taurus Star-Forming Region with the Sloan Digital Sky Survey
• Periodic accretion from a circumbinary disk in the young binary UZ Tau E
• Orbital Motion in Pre-Main Sequence Binaries
• Sub-stellar Companions and Stellar Multiplicity in the Taurus Star-Forming Region
• A Multi-Epoch HST Study of the Herbig-Haro Flow from XZ Tauri
• Dynamical Mass Estimates for Incomplete Orbits: Young Multiple Stars in Taurus and Ophiuchus
• Orbits and Masses in the T Tauri System
• A Lucky Imaging search for stellar companions to transiting planet host stars
• AstraLux: the Calar Alto Lucky Imaging Camera
• Brown Dwarf Binaries from Disintegrating Triple Systems
• High Frame-rate Imaging Based Photometry, Photometric Reduction of Data from Electron-multiplying Charge Coupled Devices (EMCCDs)
• Reverse Rotation of the Accretion Disk in RW Aur A: Observations and a Physical Model
• The young binary HD 102077: Orbit, spectral type, kinematics, and moving group membership
• Spatially-resolved Chandra Imaging Spectroscopy of the classical/weak-lined T Tauri system V710 Tau

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