72 citations · 162 across the 6 of their papers we have counts for
6 papers · 1 filter
The AstraLux large M dwarf survey
Felix Hormuth, Wolfgang Brandner, Markus Janson +2
AstraLux is the Lucky Imaging camera for the Calar Alto 2.2-m telescope and the 3.5-m NTT at La Silla. It allows nearly diffraction limited imaging in the SDSS i' and z' bands of o…
PYRAMIR: Calibration and operation of a pyramid near-infrared wavefront sensor
D. Peter, M. Feldt, B. Dorner +3
The concept of pyramid wavefront sensors (PWFS) has been around about a decade by now. However, there is still a great lack of characterizing measurements that allow the best opera…
GRAVITY: getting to the event horizon of Sgr A*
F. Eisenhauer, G. Perrin, W. Brandner +45
We present the second-generation VLTI instrument GRAVITY, which currently is in the preliminary design phase. GRAVITY is specifically designed to observe highly relativistic motion…
Atmospheric refractivity effects on mid-infrared ELT adaptive optics
S. Kendrew, L. Jolissaint, R. J. Mathar +3
We discuss the effect of atmospheric dispersion on the performance of a mid-infrared adaptive optics assisted instrument on an extremely large telescope (ELT). Dispersion and atmos…
A comprehensive examination of the Eps Eri system -- Verification of a 4 micron narrow-band high-contrast imaging approach for planet searches
Markus Janson, Sabine Reffert, Wolfgang Brandner +3
Due to its proximity, youth, and solar-like characteristics with a spectral type of K2V, Eps Eri is one of the most extensively studied systems in an extrasolar planet context. Bas…
GRAVITY: The adaptive optics assisted, two object beam combiner for the VLTI
S. Gillessen, G. Perrin, W. Brandner +8
We present the adaptive optics assisted, near-infrared VLTI instrument - GRAVITY - for precision narrow-angle astrometry and interferometric phase referenced imaging of faint objec…