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|Title:||New circumstellar structure in the T Tauri system. A near-infrared high-contrast imaging study||Authors:||Kasper, M.
RADHAKRISHNAN SANTHAKUMARI, KALYAN KUMAR
Herbst, T. M.
|Issue Date:||2016||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||593||First Page:||A50||Abstract:||<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 H<SUB>2</SUB>, 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 H<SUB>2</SUB> 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.||URI:||http://hdl.handle.net/20.500.12386/29657||URL:||https://www.aanda.org/articles/aa/full_html/2016/09/aa27818-15/aa27818-15.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201527818||Bibcode ADS:||2016A&A...593A..50K||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Jan 16, 2021
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