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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 731571.0, MPI für Astronomie / Publikationen_mpia
New circumstellar structure in the T Tauri system. A near-infrared high-contrast imaging study
Authors:Kasper, M.; Santhakumari, K. K. R.; Herbst, T. M.; Köhler, R.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Astronomy and Astrophysics
Volume:593
Start Page:id. A50 (8 pp)
Audience:Not Specified
Abstract / Description:<BR /> Aims: The immediate vicinity of T Tauri was observed with the new high-contrast imaging instrument SPHERE at the VLT to resolve remaining mysteries of the system, such as the putative small edge-on disk around T Tauri Sa and the assignment of the complex outflow patterns to the individual stars. <BR /> Methods: We used SPHERE IRDIS narrow-band classical imaging in Paβ, Brγ, and the ν = 1-0 S(1) line of H2, as well as in the nearby continua to obtain high spatial resolution and high-contrast images over the near-infrared spectral range. Line maps were created by subtracting the nearby continuum. We also reanalyzed coronagraphic data taken with SPHERE's integral field spectrograph in J- and H-band with the goal of obtaining a precise extinction estimate to T Tauri Sb, and of verifying the recently reported claim of another stellar or substellar object in the system. <BR /> Results: A previously unknown coiling structure is observed southwest of the stars in reflected light, which points to the vicinity of T Tauri N. We map the circumbinary emission from T Tauri S in J- and H-band scattered light for the first time, showing a morphology that differs significantly from that observed in K-band. Molecular Hydrogen emission is found southwest of the stars, near the coiling structure. We also detect the H2 emitting region T Tauri NW. The motion of T Tauri NW with respect to T Tauri N and S between previous images and our 2014 data provides strong evidence that the southeast-northwest outflow triggering T Tauri NW is likely to be associated with T Tauri S. We also present accurate relative photometry of the stars, which confirms that T Tauri Sa is brightening again. Our analysis rules out the presence of the recently proposed companion to T Tauri N with high confidence.
Free Keywords:techniques: high angular resolution; stars: formation; stars: individual: T Tauri; stars: winds; outflows
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201527818
URL:http://cdsads.u-strasbg.fr/abs/2016A%26A...593A..5...
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