scholarly journals Near-Infrared Coronagraphic Observations of the T Tauri Binary System UY Aur

2007 ◽  
Vol 134 (2) ◽  
pp. 880-885 ◽  
Author(s):  
Tomonori Hioki ◽  
Yoichi Itoh ◽  
Yumiko Oasa ◽  
Misato Fukagawa ◽  
Tomoyuki Kudo ◽  
...  
Keyword(s):  
Binary System ◽  
Near Infrared ◽  
T Tauri

scholarly journals High-Resolution Near-Infrared Images of the T Tauri Binary System XZ Tauri

2009 ◽  
Vol 61 (6) ◽  
pp. 1271-1279 ◽  
Author(s):  
Tomonori Hioki ◽  
Yoichi Itoh ◽  
Yumiko Oasa ◽  
Misato Fukagawa ◽  
Tomoyuki Kudo ◽  
...  
Keyword(s):  
High Resolution ◽  
Binary System ◽  
Near Infrared ◽  
Infrared Images ◽  
T Tauri

scholarly journals The wind and the magnetospheric accretion onto the T Tauri star S Coronae Australis at sub-au resolution

2017 ◽  
Vol 608 ◽  
pp. A78 ◽  
Author(s):  
◽  
R. Garcia Lopez ◽  
K. Perraut ◽  
A. Caratti o Garatti ◽  
B. Lazareff ◽  
...  
Keyword(s):  
Binary System ◽  
Spectral Resolution ◽  
Near Infrared ◽  
Line Emission ◽  
High Spectral Resolution ◽  
Simultaneous Presence ◽  
Field Mode ◽  
T Tauri ◽  
Magnetospheric Accretion ◽  
The Continuum

Aims. To investigate the inner regions of protoplanetary discs, we performed near-infrared interferometric observations of the classical T Tauri binary system S CrA. Methods. We present the first VLTI-GRAVITY high spectral resolution (R ~ 4000) observations of a classical T Tauri binary, S CrA (composed of S CrA N and S CrA S and separated by ~1.̋4), combining the four 8m telescopes in dual-field mode. Results. Our observations in the near-infrared K-band continuum reveal a disc around each binary component, with similar half-flux radii of about 0.1 au at d ~ 130 pc, inclinations (i = 28 ± 3° and i = 22 ± 6°), and position angles (PA = 0°± 6° and PA = –2°± 12°), suggesting that they formed from the fragmentation of a common disc. The S CrA N spectrum shows bright He i and Brγ line emission exhibiting inverse P Cygni profiles, typically associated with infalling gas. The continuum-compensated Brγ line visibilities of S CrA N show the presence of a compact Brγ emitting region whose radius is about ~0.06 au, which is twice as big as the truncation radius. This component is mostly tracing a wind. Moreover, a slight radius change between the blue- and red-shifted Brγ line components is marginally detected. Conclusions. The presence of an inverse P Cygni profile in the He i and Brγ lines, along with the tentative detection of a slightly larger size of the blue-shifted Brγ line component, hint at the simultaneous presence of a wind and magnetospheric accretion in S CrA N.

scholarly journals Near-Infrared Coronagraphy of the GG Tauri A Binary System

2002 ◽  
Vol 54 (6) ◽  
pp. 963-967 ◽  
Author(s):  
Yoichi Itoh ◽  
Motohide Tamura ◽  
Saeko S. Hayashi ◽  
Yumiko Oasa ◽  
Misato Fukagawa ◽  
...  
Keyword(s):  
Binary System ◽  
Near Infrared

scholarly journals A triple star in disarray

2020 ◽  
Vol 644 ◽  
pp. A114
Author(s):  
M. Kasper ◽  
K. K. R. Santhakumari ◽  
T. M. Herbst ◽  
R. van Boekel ◽  
F. Menard ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
State Of The Art ◽  
High Contrast ◽  
Compelling Evidence ◽  
T Tauri ◽  
Reflected Light ◽  
First Time ◽  
Triple Star ◽  
Outflow System

Aims. T Tauri remains an enigmatic triple star for which neither the evolutionary state of the stars themselves, nor the geometry of the complex outflow system is completely understood. Eight-meter class telescopes equipped with state-of-the-art adaptive optics provide the spatial resolution necessary to trace tangential motion of features over a timescale of a few years, and they help to associate them with the different outflows. Methods. We used J-, H-, and K-band high-contrast coronagraphic imaging with VLT-SPHERE recorded between 2016 and 2018 to map reflection nebulosities and obtain high precision near-infrared (NIR) photometry of the triple star. We also present H2 emission maps of the ν = 1-0 S(1) line at 2.122 μm obtained with LBT-LUCI during its commissioning period at the end of 2016. Results. The data reveal a number of new features in the system, some of which are seen in reflected light and some are seen in H2 emission; furthermore, they can all be associated with the main outflows. The tangential motion of the features provides compelling evidence that T Tauri Sb drives the southeast–northwest outflow. T Tauri Sb has recently faded probably because of increased extinction as it passes through the southern circumbinary disk. While Sb is approaching periastron, T Tauri Sa instead has brightened and is detected in all our J-band imagery for the first time.

A near Infrared Speckle Imaging Study of T Tauri Stars

1994 ◽  
pp. 449-452
Author(s):  
A. M. Ghez ◽  
D. W. Mccarthy ◽  
A. J. Weinberger ◽  
G. Neugebauer ◽  
K. Matthews
Keyword(s):  
Near Infrared ◽  
Imaging Study ◽  
T Tauri Stars ◽  
Speckle Imaging ◽  
T Tauri
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