Edge-on disk around the T Tauri star [MR81] Halpha 17 NE in CrA
R. Neuhaeuser, S. Kraemer, M. Mugrauer (AIU Jena), R. Koehler (MPIA, Heidelberg), T.O.B. Schmidt (AIU Jena), M. Ammler-von Eiff (U Lissboa), J., Alves (Calar Alto Obs.), S. Fiedler (AIU Jena), N. Vogt (U Valparaiso)

TL;DR
This study reveals a binary system of two low-mass T Tauri stars in CrA, with one featuring a nearly edge-on disk and active accretion, providing insights into early stellar evolution and disk properties.
Contribution
First detailed characterization of a binary T Tauri system with an edge-on disk and accretion features in the CrA star-forming region.
Findings
Both stars are coeval (~2-3 Myr) and at the same distance (~130 pc).
The NE component has a nearly edge-on disk and active accretion signatures.
The system consists of low-mass stars with masses approximately 0.5 and 0.23 solar masses.
Abstract
Using the speckle camera SHARP at the 3.5m ESO NTT, K\"ohler and collaborators found an object ~3.5 mag fainter in K only 1.3" north-east of the T Tauri star [MR81] Ha 17 in the Corona Australis (CrA) star-forming region, which could be either a brown dwarf or a T Tauri star with an edge-on disk. We attempt to study this faint object in detail. We acquired deep VLT NACO near-infrared images at three epochs to determine, whether [MR81] Ha 17 and the nearby faint object are co-moving and to measure the infrared colors of both objects. We obtained optical and infrared spectra of both objects with the VLT using FORS and ISAAC, respectively, to determine spectral types and temperatures as well as ages and masses. The T Tauri star [MR81] Ha 17 and the faint nearby object have a projected separation of 1369.58 mas, i.e. 178 AU at 130 pc. They share the same proper motion (~5 sigma), so that…
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