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Direct imaging of the young spectroscopic binary HD 160934
Felix Hormuth, Wolfgang Brandner, Stefan Hippler +2
We report on the direct detection of a close companion to HD 160934, a young active star, SB1 spectroscopic binary, and suggested member of the AB Doradus moving group. High angula…
Improved age constraints for the AB Dor quadruple system - The binary nature of AB Dor B
Markus Janson, Wolfgang Brandner, Rainer Lenzen +5
We present resolved NACO photometry of the close binary AB Dor B in H- and Ks-band. AB Dor B is itself known to be a wide binary companion to AB Dor A, which in turn has a very low…
Search for Giant Planets around White Dwarfs with HST, Spitzer, and VLT
S. Friedrich, H. Zinnecker, S. Correia +3
For the last three years we have performed a survey for young (<3 Gyrs) giant planets around nearby white dwarfs with HST, Spitzer, and VLT. Direct HST/NICMOS imaging of the seven…
A direct and differential imaging search for sub-stellar companions to epsilon Indi A
K. Geissler, S. Kellner, W. Brandner +7
We have carried out a direct and differential imaging search for sub-stellar companions to eps Indi A using the adaptive optics system NACO at the ESO VLT. The observations were ca…
Atmosphere-like turbulence generation with surface-etched phase-screens
Stefan Hippler, Felix Hormuth, David J. Butler +2
We built and characterized an optical system that emulates the optical characteristics of an 8m-class telescope like the Very Large Telescope. The system contains rotating glass ph…
High-Resolution Spectroscopy in Tr37: Gas Accretion Evolution in Evolved Dusty Disks
Aurora Sicilia-Aguilar, Lee Hartmann, Gabor Furezs +3
Using the Hectochelle multifiber spectrograph, we have obtained high-resolution (R~34,000) spectra in the Halpha region for a large number of stars in the 4 Myr-old cluster Tr 37,…