We present an overview of our ongoing systematic search for wide (sub)stellar companions around the stars known to host rad-vel planets. By using a relatively large field of view and going very deep, our survey can find all directly detectable stellar and massive brown dwarf companions (m>40 MJup) within a 1000 AU orbit.

We analyze the idea that nuclear activity, either AGN or star formation, can be triggered by interactions, studying the percentage of active, HII and quiescent galaxies with companions. Our sample was selected from the Palomar survey, and avoids selection biases faced by previous studies. This sample was split into 5 different groups, Seyfert galaxies, LINERs, transition galaxies, HII galaxies ...

OBJECTIVES Patients are often accompanied by family or companions during consultations, but little is known about how this might influence the process. We explored how the presence of a companion in a consultation contributes to communication and the decision-making process. DESIGN Observational study. SETTING A teaching hospital and a district general hospital in south-west England. PART...

Disc galaxies can be substantially modified by close encounters and mergers, since their discs are very responsive components. Close interactions can be held responsible for the formation of bridges and tails, as well as for the formation of some bars, asymmetries and grand design spirals. Bound clumps can form in the tails, due to self-gravity, and could evolve to dwarf galaxies. Off-centering...

Microlensing is sensitive to binary, brown dwarf (BD), and planetary companions to normal stars in the Galactic bulge with separations between about 1-10 AU. The accurate, densely-sampled photometry of microlensing events needed to detect planetary companions has been achieved by several follow-up collaborations. Detailed analysis of microlensing events toward the bulge demonstrates that less t...

Context. Direct imaging using various techniques for suppressing the stellar halo nowadays achieves the contrast levels required to detect and characterize light of substellar companions at orbital distances larger than a few astronomical units from their host stars. The method nicely complements the radial velocity surveys that provide evidence that giant extrasolar planets in close-in orbits ...

Aims. We present the results of a deep imaging survey of stars surrounded by planets detected with the radial velocity technique. The purpose is to search for and to characterize long-period stellar and substellar companions. The sample contains a total of 26 stars, among which 6 exhibit additional radial velocity drifts. Methods. We used NACO, at the ESO Very Large Telescope, and PUEO-KIR, at ...

We show that a common evolutionary history can produce the black hole binaries in the Galaxy in which the black holes have masses of ∼ 5− 10M⊙. In with low-mass, ∼ < 2.5M⊙, ZAMS (zero age main sequence) companions, the latter remain in main sequence during the active stage of soft X-ray transients (SXTs), most of them being of K or M classification. In two intermediate cases, IL Lupi and Nova S...

Context. The Exozodi survey aims to determine the occurrence rate of bright exozodiacal discs around nearby main sequence stars using infrared interferometry. Although the Exozodi survey targets have been carefully selected to avoid the presence of binary stars, the results of this survey can still be biased by the presence of unidentified stellar companions. Aims. Using the PIONIER data set co...