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Resolving the L/T transition binary SDSS J2052-1609 AB
M. B. Stumpf, K. Geißler, H. Bouy +3
Binaries provide empirical key constraints for star formation theories, like the overall binary fraction, mass ratio distribution and the separation distribution. They play a cruci…
The search for planetary mass companions to field brown dwarfs with HST/NICMOS
M. B. Stumpf, W. Brandner, V. Joergens +4
We present the results of a high-resolution spectral differential imaging survey of 12 nearby, relatively young field L dwarfs (<1 Gyr) carried out with HST/NICMOS to search for pl…
Multi-wavelength study of the disk around the very low-mass star Par-Lup3-4
N. Huelamo, H. Bouy, C. Pinte +8
Par-Lup3-4 is a very low-mass star (spectral type M5) in the Lupus III star-forming region. The object is underluminous by ~4 mag when compared to objects of similar mass in the sa…
Adaptive optics observations of the T10 ultracool dwarf UGPSJ072227.51-054031.2
H. Bouy, J. Girard, E. L. Martin +2
With a spectral type of T10, UGPS J072227.51-054031.2 is one of the coolest objects known to date in the solar neighborhood. Multiple systems are relatively common among early and…
The 2008 Outburst in the Young Stellar System Z CMa: The First Detection of Twin Jets
Emma Whelan, Catherine Dougados, Marshall Perrin +11
The Z CMa binary is understood to undergo both FU Orionis (FUOR) and EX Orionis (EXOR) type outbursts. While the SE component has been spectro- scopically identified as an FUOR, th…
Spectroscopic characterization of 78 DENIS ultracool dwarf candidates in the solar neighborhood and the Upper Sco OB association
E. L. Martin, N. Phan-Bao, M. Bessell +6
Aims: Low-resolution optical spectroscopic observations for 78 very low-mass star and brown dwarf candidates that have been photometrically selected using the DENIS survey point so…