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On the alignment of T Tauri stars with the local magnetic field
G. Duchene, F. Menard
Magnetic field is believed to play an important role in the collapse of a molecular cloud. In particular, due to the properties of magnetic forces, collapse should be easier along…
Stellar Orbits Around the Galactic Center Black Hole
A. M. Ghez, S. Salim, S. D. Hornstein +5
We present new proper motion measurements and simultaneous orbital solutions for three newly identified (S0-16, S0-19, and S0-20) and four previously known (S0-1, S0-2, S0-4, and S…
Non coeval young multiple systems? On the pairing of protostars and T Tauri stars
Gaspard Duchene, Andrea Ghez, Caer McCabe
We summarize here the observed properties of ``infrared companions'' to T Tauri stars and argue that their observational properties are identical to those of Class I sources. They…
The First Detection of Spatially Resolved Mid-Infrared Scattered Light from a Protoplanetary Disk
C. McCabe, G. Duchene, A. M. Ghez
We report spatially resolved 11.8 micron images, obtained at the W. M. Keck 10 m telescope, of the protoplanetary disk around the pre--main-sequence star HK Tau B. The mid-infrared…
No Fossil Disk in the T Tauri Multiple System V773 Tau
G. Duchene, A. M. Ghez, C. McCabe +1
We present new multi-epoch near-infrared and optical high-angular images of the V773 Tau pre-main sequence triple system, a weak-line T Tauri (WTTS) system in which the presence of…
Full Three Dimensional Orbits For Multiple Stars on Close Approaches to the Central Supermassive Black Hole
A. M. Ghez, E. Becklin, G. Duchene +4
With the advent of adaptive optics on the W. M. Keck 10 m telescope, two significant steps forward have been taken in building the case for a supermassive black hole at the center…
The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth
A. M. Ghez, G. Duchene, K. Matthews +11
We have obtained the first detection of spectral absorption lines in one of the high-velocity stars in the vicinity of the Galaxy's central supermassive black hole. Both Brgamma (2…