Context. Transit search programs such as CoRoT and Kepler now have the capability of detecting planets as small as the Earth. The detection of these planets however requires the removal of all false positives. Although many false positives can be identified by a detailed analysis of the light-curves (LCs), the detections of others require

We present high spatial resolution SEDs, on the scales of a few tens of parsec, of some of the nearest and most well known, radio-quiet AGN. The new SEDs are found to largely depart, in shape and bolometric luminosity, from those compiled from large aperture IR satellite data. Type 1 and 2 radio quiet AGN can clearly be identified by the overall

We present ground-based optical observations of the 2009 September and 2010 January transits of HD 80606b. Based on three partial light curves of the 2009 September event, we derive a midtransit time of Tc [HJD] = 2455099.196 ± 0.026, which is about 1σ away from the previously predicted time. We observed the 2010 January event from nine different

Our conception of galaxy evolution inside clusters have recently changed due to an increasing evidence suggesting a pre-processing of galaxies at moderate densities. Based on the high frequency of interacting systems found at intermediate densities, we use the SDSS-DR4 data to analyse the role of close galaxy interactions as environmental

It is foreseen that in the near future we will be able to measure the light from extrasolar planets similar to the Earth. When these data become available, a truly interdisciplinary approach to their analysis will be necessary in order to understand the physical properties of these worlds based on globally-averaged measurements. In this task

Context. The Tully-Fisher relation represents a connection between fundamental galaxy parameters, such as its total mass and the mass locked in stars. Therefore, the study of the evolution of this relation in the optical and infrared bands can provide valuable information about the evolution of the individual galaxies through the changes found in